{"id":83254,"date":"2024-12-30T16:30:06","date_gmt":"2024-12-30T09:30:06","guid":{"rendered":"https:\/\/itviec.com\/blog\/?p=83254"},"modified":"2024-12-30T16:30:06","modified_gmt":"2024-12-30T09:30:06","slug":"cau-hoi-phong-van-nosql","status":"publish","type":"post","link":"https:\/\/itviec.com\/blog\/cau-hoi-phong-van-nosql\/","title":{"rendered":"Top 30+ c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NoSQL th\u01b0\u1eddng g\u1eb7p nh\u1ea5t"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_84 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">N\u1ed9i dung b\u00e0i vi\u1ebft<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/itviec.com\/blog\/cau-hoi-phong-van-nosql\/#Tong_quan_ve_NoSQL\" >T\u1ed5ng quan v\u1ec1 NoSQL<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/itviec.com\/blog\/cau-hoi-phong-van-nosql\/#Cac_vi_tri_yeu_cau_ky_nang_NoSQL\" >C\u00e1c v\u1ecb tr\u00ed y\u00eau c\u1ea7u k\u1ef9 n\u0103ng NoSQL<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/itviec.com\/blog\/cau-hoi-phong-van-nosql\/#Cac_cau_hoi_phong_van_NoSQL_co_ban\" >C\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NoSQL c\u01a1 b\u1ea3n<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/itviec.com\/blog\/cau-hoi-phong-van-nosql\/#Cac_cau_hoi_phong_van_NoSQL_ve_quan_ly_va_luu_tru_du_lieu\" >C\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NoSQL v\u1ec1 qu\u1ea3n l\u00fd v\u00e0 l\u01b0u tr\u1eef d\u1eef li\u1ec7u<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/itviec.com\/blog\/cau-hoi-phong-van-nosql\/#Cac_cau_hoi_phong_van_NoSQL_ve_hieu_suat_va_toi_uu_hoa\" >C\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NoSQL v\u1ec1 hi\u1ec7u su\u1ea5t v\u00e0 t\u1ed1i \u01b0u ho\u00e1<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/itviec.com\/blog\/cau-hoi-phong-van-nosql\/#Cac_cau_hoi_phong_van_NoSQL_ve_bao_mat\" >C\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NoSQL v\u1ec1 b\u1ea3o m\u1eadt<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/itviec.com\/blog\/cau-hoi-phong-van-nosql\/#Cac_cau_hoi_phong_van_%E2%80%8B%E2%80%8BNoSQL_Integration_tich_hop_NoSQL\" >C\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n \u200b\u200bNoSQL Integration (t\u00edch h\u1ee3p NoSQL)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/itviec.com\/blog\/cau-hoi-phong-van-nosql\/#Tong_ket_cau_hoi_phong_van_NoSQL\" >T\u1ed5ng k\u1ebft c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NoSQL<\/a><\/li><\/ul><\/nav><\/div>\n<p><em><strong>V\u1edbi kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng linh ho\u1ea1t, hi\u1ec7u su\u1ea5t cao, NoSQL \u0111\u00e3 tr\u1edf th\u00e0nh l\u1ef1a ch\u1ecdn h\u00e0ng \u0111\u1ea7u cho nhi\u1ec1u doanh nghi\u1ec7p hi\u1ec7n \u0111\u1ea1i v\u00e0 l\u00e0 k\u1ef9 n\u0103ng c\u1ea7n c\u00f3 cho nhi\u1ec1u v\u1ecb tr\u00ed ngh\u1ec1 nghi\u1ec7p. Ch\u00ednh v\u00ec th\u1ebf, \u0111\u1ec3 chu\u1ea9n b\u1ecb cho bu\u1ed5i ph\u1ecfng v\u1ea5n chuy\u00ean m\u00f4n s\u1eafp t\u1edbi, sau \u0111\u00e2y l\u00e0 30+ c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NoSQL c\u1ea7n bi\u1ebft.<\/strong><\/em><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u1ecdc b\u00e0i vi\u1ebft sau \u0111\u1ec3 hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">C\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NoSQL c\u01a1 b\u1ea3n<\/span><\/li>\n<li aria-level=\"1\">C\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NoSQL v\u1ec1 qu\u1ea3n l\u00fd v\u00e0 l\u01b0u tr\u1eef d\u1eef li\u1ec7u<\/li>\n<li aria-level=\"1\">C\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NoSQL v\u1ec1 hi\u1ec7u su\u1ea5t v\u00e0 t\u1ed1i \u01b0u h\u00f3a<\/li>\n<li aria-level=\"1\">C\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NoSQL v\u1ec1 b\u1ea3o m\u1eadt<\/li>\n<li aria-level=\"1\">C\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NoSQL Integration<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Tong_quan_ve_NoSQL\"><\/span><b>T\u1ed5ng quan v\u1ec1 NoSQL<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">NoSQL (Not Only SQL) l\u00e0 m\u1ed9t lo\u1ea1i c\u01a1 s\u1edf d\u1eef li\u1ec7u phi quan h\u1ec7 th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 x\u1eed l\u00fd phi c\u1ea5u tr\u00fac ho\u1eb7c b\u00e1n c\u1ea5u tr\u00fac. Kh\u00e1c v\u1edbi c\u01a1 s\u1edf d\u1eef li\u1ec7u quan h\u1ec7 truy\u1ec1n th\u1ed1ng (SQL), NoSQL kh\u00f4ng y\u00eau c\u1ea7u m\u1ed9t schema c\u1ed1 \u0111\u1ecbnh v\u00e0 th\u01b0\u1eddng h\u1ed7 tr\u1ee3 kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng theo chi\u1ec1u ngang, ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng hi\u1ec7n \u0111\u1ea1i nh\u01b0 m\u1ea1ng x\u00e3 h\u1ed9i, h\u1ec7 th\u1ed1ng th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed ho\u1eb7c ph\u00e2n t\u00edch d\u1eef li\u1ec7u l\u1edbn.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">NoSQL \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n \u0111\u1ec3 gi\u1ea3i quy\u1ebft c\u00e1c h\u1ea1n ch\u1ebf c\u1ee7a h\u1ec7 th\u1ed1ng SQL trong vi\u1ec7c x\u1eed l\u00fd kh\u1ed1i l\u01b0\u1ee3ng d\u1eef li\u1ec7u ng\u00e0y c\u00e0ng t\u0103ng, \u0111\u1eb7c bi\u1ec7t l\u00e0 trong m\u00f4i tr\u01b0\u1eddng ph\u00e2n t\u00e1n. \u0110i\u1ec3m m\u1ea1nh c\u1ee7a NoSQL bao g\u1ed3m t\u00ednh linh ho\u1ea1t, hi\u1ec7u su\u1ea5t cao v\u00e0 kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng, gi\u00fap \u0111\u00e1p \u1ee9ng t\u1ed1t h\u01a1n nhu c\u1ea7u c\u1ee7a c\u00e1c \u1ee9ng d\u1ee5ng hi\u1ec7n \u0111\u1ea1i.<\/span><\/p>\n<h3><b>\u1ee8ng d\u1ee5ng c\u1ee7a NoSQL<\/b><\/h3>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Ph\u00e2n t\u00edch d\u1eef li\u1ec7u l\u1edbn (Big Data Analytics)<\/b><span style=\"font-weight: 400;\">: NoSQL \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 x\u1eed l\u00fd v\u00e0 ph\u00e2n t\u00edch kh\u1ed1i l\u01b0\u1ee3ng d\u1eef li\u1ec7u kh\u1ed5ng l\u1ed3 t\u1eeb nhi\u1ec1u ngu\u1ed3n kh\u00e1c nhau, ch\u1eb3ng h\u1ea1n nh\u01b0 log m\u00e1y ch\u1ee7, d\u1eef li\u1ec7u m\u1ea1ng x\u00e3 h\u1ed9i ho\u1eb7c c\u1ea3m bi\u1ebfn IoT (Internet of Things). V\u1edbi kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng ngang v\u00e0 x\u1eed l\u00fd d\u1eef li\u1ec7u phi c\u1ea5u tr\u00fac, NoSQL l\u00e0 l\u1ef1a ch\u1ecdn ph\u00f9 h\u1ee3p v\u1edbi t\u00ednh linh ho\u1ea1t v\u00e0 kh\u1ea3 n\u0103ng t\u00f9y ch\u1ec9nh, cho ph\u00e9p c\u00e1c doanh nghi\u1ec7p tr\u00edch xu\u1ea5t th\u00f4ng tin gi\u00e1 tr\u1ecb t\u1eeb d\u1eef li\u1ec7u l\u1edbn m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>X\u1eed l\u00fd d\u1eef li\u1ec7u th\u1eddi gian th\u1ef1c (Real-time Data Processing)<\/b><span style=\"font-weight: 400;\">: Nhi\u1ec1u \u1ee9ng d\u1ee5ng hi\u1ec7n \u0111\u1ea1i nh\u01b0 h\u1ec7 th\u1ed1ng g\u1ee3i \u00fd, b\u1ea3ng tin m\u1ea1ng x\u00e3 h\u1ed9i, ho\u1eb7c c\u00e1c \u1ee9ng d\u1ee5ng th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed y\u00eau c\u1ea7u x\u1eed l\u00fd d\u1eef li\u1ec7u ngay l\u1eadp t\u1ee9c. NoSQL, \u0111\u1eb7c bi\u1ec7t l\u00e0 c\u00e1c c\u01a1 s\u1edf d\u1eef li\u1ec7u t\u1ed1i \u01b0u cho vi\u1ec7c truy xu\u1ea5t t\u1ed1c \u0111\u1ed9 cao, h\u1ed7 tr\u1ee3 x\u00e2y d\u1ef1ng c\u00e1c \u1ee9ng d\u1ee5ng c\u00f3 kh\u1ea3 n\u0103ng x\u1eed l\u00fd lu\u1ed3ng d\u1eef li\u1ec7u v\u00e0 cung c\u1ea5p ph\u1ea3n h\u1ed3i t\u1ee9c th\u00ec.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>H\u1ec7 th\u1ed1ng qu\u1ea3n l\u00fd n\u1ed9i dung (Content Management Systems)<\/b><span style=\"font-weight: 400;\">: CMS th\u01b0\u1eddng x\u1eed l\u00fd c\u00e1c lo\u1ea1i d\u1eef li\u1ec7u \u0111a d\u1ea1ng nh\u01b0 v\u0103n b\u1ea3n, h\u00ecnh \u1ea3nh v\u00e0 video. NoSQL cung c\u1ea5p s\u1ef1 linh ho\u1ea1t trong vi\u1ec7c l\u01b0u tr\u1eef v\u00e0 truy xu\u1ea5t c\u00e1c lo\u1ea1i d\u1eef li\u1ec7u n\u00e0y, \u0111\u1ed3ng th\u1eddi \u0111\u1ea3m b\u1ea3o kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng khi kh\u1ed1i l\u01b0\u1ee3ng n\u1ed9i dung ng\u00e0y c\u00e0ng t\u0103ng.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>C\u00e1c \u1ee9ng d\u1ee5ng v\u1edbi y\u00eau c\u1ea7u m\u1edf r\u1ed9ng cao<\/b><span style=\"font-weight: 400;\">: Trong c\u00e1c h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n to\u00e0n c\u1ea7u ho\u1eb7c x\u1eed l\u00fd h\u00e0ng tri\u1ec7u giao d\u1ecbch m\u1ed7i ng\u00e0y, NoSQL cung c\u1ea5p kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng theo chi\u1ec1u ngang, cho ph\u00e9p th\u00eam nhi\u1ec1u m\u00e1y ch\u1ee7 \u0111\u1ec3 t\u0103ng hi\u1ec7u n\u0103ng m\u00e0 kh\u00f4ng l\u00e0m gi\u00e1n \u0111o\u1ea1n h\u1ec7 th\u1ed1ng.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>H\u1ec7 th\u1ed1ng k\u1ebft h\u1ee3p SQL v\u00e0 NoSQL (Hybrid Approaches)<\/b><span style=\"font-weight: 400;\">: Nhi\u1ec1u t\u1ed5 ch\u1ee9c hi\u1ec7n nay \u00e1p d\u1ee5ng c\u00e1ch ti\u1ebfp c\u1eadn k\u1ebft h\u1ee3p, s\u1eed d\u1ee5ng SQL cho d\u1eef li\u1ec7u c\u00f3 c\u1ea5u tr\u00fac v\u00e0 NoSQL cho d\u1eef li\u1ec7u phi c\u1ea5u tr\u00fac ho\u1eb7c b\u00e1n c\u1ea5u tr\u00fac. Cho ph\u00e9p t\u1eadn d\u1ee5ng s\u1ee9c m\u1ea1nh c\u1ee7a c\u1ea3 hai lo\u1ea1i c\u01a1 s\u1edf d\u1eef li\u1ec7u \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c chi\u1ebfn l\u01b0\u1ee3c qu\u1ea3n l\u00fd d\u1eef li\u1ec7u to\u00e0n di\u1ec7n v\u00e0 hi\u1ec7u qu\u1ea3.<\/span><\/li>\n<\/ul>\n<blockquote><p><em>\u0110\u1ecdc th\u00eam: <a href=\"https:\/\/itviec.com\/blog\/nosql-la-gi\/\" target=\"_blank\" rel=\"noopener\"><strong>NoSQL l\u00e0 g\u00ec? V\u00ec sao g\u1ecdi NoSQL l\u00e0 b\u01b0\u1edbc ti\u1ebfn m\u1edbi trong qu\u1ea3n l\u00fd d\u1eef li\u1ec7u?<\/strong><\/a><\/em><\/p><\/blockquote>\n<h2><span class=\"ez-toc-section\" id=\"Cac_vi_tri_yeu_cau_ky_nang_NoSQL\"><\/span><b>C\u00e1c v\u1ecb tr\u00ed y\u00eau c\u1ea7u k\u1ef9 n\u0103ng NoSQL<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">V\u1edbi s\u1ef1 b\u00f9ng n\u1ed5 c\u1ee7a d\u1eef li\u1ec7u l\u1edbn v\u00e0 nhu c\u1ea7u x\u1eed l\u00fd d\u1eef li\u1ec7u phi c\u1ea5u tr\u00fac, c\u00e1c v\u1ecb tr\u00ed c\u00f4ng vi\u1ec7c li\u00ean quan \u0111\u1ebfn NoSQL ng\u00e0y c\u00e0ng tr\u1edf n\u00ean ph\u1ed5 bi\u1ebfn trong nhi\u1ec1u l\u0129nh v\u1ef1c.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 vai tr\u00f2 ti\u00eau bi\u1ec3u y\u00eau c\u1ea7u k\u1ef9 n\u0103ng NoSQL:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Qu\u1ea3n tr\u1ecb vi\u00ean c\u01a1 s\u1edf d\u1eef li\u1ec7u (Database Administrator &#8211; DBA)<\/b><span style=\"font-weight: 400;\">: Qu\u1ea3n tr\u1ecb vi\u00ean c\u01a1 s\u1edf d\u1eef li\u1ec7u ch\u1ecbu tr\u00e1ch nhi\u1ec7m qu\u1ea3n l\u00fd, b\u1ea3o tr\u00ec v\u00e0 t\u1ed1i \u01b0u h\u00f3a c\u00e1c h\u1ec7 th\u1ed1ng c\u01a1 s\u1edf d\u1eef li\u1ec7u, bao g\u1ed3m c\u1ea3 NoSQL. C\u00e1c nh\u00e0 tuy\u1ec3n d\u1ee5ng th\u01b0\u1eddng t\u00ecm ki\u1ebfm nh\u1eefng \u1ee9ng vi\u00ean c\u00f3 kinh nghi\u1ec7m v\u1edbi c\u00e1c n\u1ec1n t\u1ea3ng nh\u01b0 MongoDB, Cassandra hay Redis.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Ki\u1ebfn tr\u00fac s\u01b0 d\u1eef li\u1ec7u (Data Architect)<\/b><span style=\"font-weight: 400;\">: Ki\u1ebfn tr\u00fac s\u01b0 d\u1eef li\u1ec7u ch\u1ecbu tr\u00e1ch nhi\u1ec7m thi\u1ebft k\u1ebf c\u00e1c m\u00f4 h\u00ecnh d\u1eef li\u1ec7u, x\u00e2y d\u1ef1ng h\u1ec7 th\u1ed1ng l\u01b0u tr\u1eef v\u00e0 ph\u00e2n t\u00edch d\u1eef li\u1ec7u. Kinh nghi\u1ec7m v\u1edbi NoSQL l\u00e0 m\u1ed9t l\u1ee3i th\u1ebf l\u1edbn khi l\u00e0m vi\u1ec7c v\u1edbi c\u00e1c h\u1ec7 th\u1ed1ng d\u1eef li\u1ec7u l\u1edbn v\u00e0 ph\u1ee9c t\u1ea1p.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Nh\u00e0 khoa h\u1ecdc d\u1eef li\u1ec7u (Data Scientist)<\/b><span style=\"font-weight: 400;\">: Nh\u00e0 khoa h\u1ecdc d\u1eef li\u1ec7u s\u1eed d\u1ee5ng NoSQL \u0111\u1ec3 thu th\u1eadp, ph\u00e2n t\u00edch v\u00e0 d\u1ef1 \u0111o\u00e1n d\u1ef1a tr\u00ean d\u1eef li\u1ec7u l\u1edbn v\u00e0 phi c\u1ea5u tr\u00fac. V\u1ecb tr\u00ed n\u00e0y th\u01b0\u1eddng y\u00eau c\u1ea7u kh\u1ea3 n\u0103ng l\u00e0m vi\u1ec7c v\u1edbi c\u00e1c c\u01a1 s\u1edf d\u1eef li\u1ec7u NoSQL \u0111\u1ec3 x\u1eed l\u00fd c\u00e1c t\u1eadp d\u1eef li\u1ec7u kh\u1ed5ng l\u1ed3 t\u1eeb nhi\u1ec1u ngu\u1ed3n kh\u00e1c nhau.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>L\u1eadp tr\u00ecnh vi\u00ean ph\u1ea7n m\u1ec1m\/\u1ee9ng d\u1ee5ng (Software\/Application Developer)<\/b><span style=\"font-weight: 400;\">: L\u1eadp tr\u00ecnh vi\u00ean c\u1ea7n s\u1eed d\u1ee5ng NoSQL \u0111\u1ec3 thi\u1ebft k\u1ebf v\u00e0 tri\u1ec3n khai c\u00e1c \u1ee9ng d\u1ee5ng x\u1eed l\u00fd d\u1eef li\u1ec7u phi c\u1ea5u tr\u00fac ho\u1eb7c b\u00e1n c\u1ea5u tr\u00fac. \u0110\u00e2y l\u00e0 m\u1ed9t trong nh\u1eefng v\u1ecb tr\u00ed ph\u1ed5 bi\u1ebfn nh\u1ea5t y\u00eau c\u1ea7u k\u1ef9 n\u0103ng NoSQL.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>K\u1ef9 s\u01b0 d\u1eef li\u1ec7u (Data Engineer)<\/b><span style=\"font-weight: 400;\">: K\u1ef9 s\u01b0 d\u1eef li\u1ec7u ch\u1ecbu tr\u00e1ch nhi\u1ec7m x\u00e2y d\u1ef1ng v\u00e0 duy tr\u00ec c\u00e1c data pipelines \u0111\u1ec3 thu th\u1eadp, x\u1eed l\u00fd v\u00e0 l\u01b0u tr\u1eef d\u1eef li\u1ec7u. K\u1ef9 n\u0103ng l\u00e0m vi\u1ec7c v\u1edbi NoSQL gi\u00fap b\u1ea1n x\u1eed l\u00fd kh\u1ed1i l\u01b0\u1ee3ng d\u1eef li\u1ec7u l\u1edbn v\u00e0 ph\u1ee9c t\u1ea1p m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Chuy\u00ean vi\u00ean DevOps (DevOps Engineer)<\/b><span style=\"font-weight: 400;\">: Trong c\u00e1c m\u00f4i tr\u01b0\u1eddng DevOps, NoSQL th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 x\u00e2y d\u1ef1ng v\u00e0 tri\u1ec3n khai c\u00e1c h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n. DevOps Engineer c\u1ea7n hi\u1ec3u bi\u1ebft v\u1ec1 NoSQL \u0111\u1ec3 t\u1ed1i \u01b0u h\u00f3a h\u1ec7 th\u1ed1ng v\u00e0 \u0111\u1ea3m b\u1ea3o hi\u1ec7u su\u1ea5t.<\/span><\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Cac_cau_hoi_phong_van_NoSQL_co_ban\"><\/span><b>C\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NoSQL c\u01a1 b\u1ea3n<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><b>C\u00e1c lo\u1ea1i c\u01a1 s\u1edf d\u1eef li\u1ec7u NoSQL g\u1ed3m nh\u1eefng lo\u1ea1i n\u00e0o?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">D\u1ef1a tr\u00ean c\u00e1ch t\u1ed5 ch\u1ee9c v\u00e0 l\u01b0u tr\u1eef d\u1eef li\u1ec7u, NoSQL \u0111\u01b0\u1ee3c chia th\u00e0nh b\u1ed1n lo\u1ea1i ch\u00ednh:<\/span><\/p>\n<h4><b>1. Key-Value Store<\/b><\/h4>\n<p><span style=\"font-weight: 400;\">L\u00e0 lo\u1ea1i c\u01a1 s\u1edf d\u1eef li\u1ec7u l\u01b0u tr\u1eef d\u1eef li\u1ec7u d\u01b0\u1edbi d\u1ea1ng c\u1eb7p kh\u00f3a-gi\u00e1 tr\u1ecb (key-value), gi\u1ed1ng nh\u01b0 m\u1ed9t t\u1eeb \u0111i\u1ec3n. D\u1eef li\u1ec7u \u0111\u01b0\u1ee3c truy xu\u1ea5t d\u1ef1a tr\u00ean kh\u00f3a (key), mang l\u1ea1i hi\u1ec7u su\u1ea5t cao trong vi\u1ec7c l\u01b0u tr\u1eef v\u00e0 truy xu\u1ea5t nhanh.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>\u01afu \u0111i\u1ec3m<\/b><span style=\"font-weight: 400;\">: T\u1ed1c \u0111\u1ed9 truy xu\u1ea5t nhanh, d\u1ec5 d\u00e0ng m\u1edf r\u1ed9ng theo chi\u1ec1u ngang.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Nh\u01b0\u1ee3c \u0111i\u1ec3m<\/b><span style=\"font-weight: 400;\">: Kh\u00f3 th\u1ef1c hi\u1ec7n truy v\u1ea5n ph\u1ee9c t\u1ea1p; ch\u1ec9 ph\u00f9 h\u1ee3p cho c\u00e1c \u1ee9ng d\u1ee5ng \u0111\u01a1n gi\u1ea3n.<\/span><\/li>\n<\/ul>\n<p><b>\u1ee8ng d\u1ee5ng:<\/b><span style=\"font-weight: 400;\"> L\u01b0u tr\u1eef phi\u00ean ng\u01b0\u1eddi d\u00f9ng, b\u1ed9 nh\u1edb cache.<\/span><\/p>\n<p><b>V\u00ed d\u1ee5:<\/b><span style=\"font-weight: 400;\"> Redis, DynamoDB, Riak.<\/span><\/p>\n<h4><b>2. Document Store<\/b><\/h4>\n<p><span style=\"font-weight: 400;\">C\u01a1 s\u1edf d\u1eef li\u1ec7u n\u00e0y l\u01b0u tr\u1eef d\u1eef li\u1ec7u d\u01b0\u1edbi d\u1ea1ng t\u00e0i li\u1ec7u (document), th\u01b0\u1eddng \u1edf \u0111\u1ecbnh d\u1ea1ng JSON, BSON ho\u1eb7c XML. D\u1eef li\u1ec7u c\u00f3 th\u1ec3 c\u00f3 c\u1ea5u tr\u00fac ho\u1eb7c kh\u00f4ng c\u00f3 c\u1ea5u tr\u00fac v\u00e0 r\u1ea5t linh ho\u1ea1t.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>\u01afu \u0111i\u1ec3m<\/b><span style=\"font-weight: 400;\">: Linh ho\u1ea1t, d\u1ec5 d\u00e0ng m\u1edf r\u1ed9ng; ph\u00f9 h\u1ee3p v\u1edbi d\u1eef li\u1ec7u b\u00e1n c\u1ea5u tr\u00fac.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Nh\u01b0\u1ee3c \u0111i\u1ec3m<\/b><span style=\"font-weight: 400;\">: Truy v\u1ea5n ph\u1ee9c t\u1ea1p c\u00f3 th\u1ec3 ch\u1eadm; y\u00eau c\u1ea7u thi\u1ebft k\u1ebf d\u1eef li\u1ec7u h\u1ee3p l\u00fd \u0111\u1ec3 tr\u00e1nh l\u1eb7p l\u1ea1i.<\/span><\/li>\n<\/ul>\n<p><b>\u1ee8ng d\u1ee5ng:<\/b><span style=\"font-weight: 400;\"> C\u00e1c \u1ee9ng d\u1ee5ng web, th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed.<\/span><\/p>\n<p><b>V\u00ed d\u1ee5:<\/b><span style=\"font-weight: 400;\"> MongoDB, CouchDB, Amazon DocumentDB.<\/span><\/p>\n<h4><b>3. Column-Family Store<\/b><\/h4>\n<p><span style=\"font-weight: 400;\">\u1ede lo\u1ea1i n\u00e0y, d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef theo c\u00e1c nh\u00f3m c\u1ed9t (column families), trong \u0111\u00f3 m\u1ed7i h\u00e0ng c\u00f3 th\u1ec3 c\u00f3 c\u00e1c c\u1ed9t kh\u00e1c nhau, kh\u00f4ng c\u1ed1 \u0111\u1ecbnh nh\u01b0 trong SQL. M\u1ed7i c\u1ed9t c\u00f3 th\u1ec3 l\u01b0u tr\u1eef nhi\u1ec1u thu\u1ed9c t\u00ednh li\u00ean quan v\u00e0 d\u1ec5 d\u00e0ng m\u1edf r\u1ed9ng. Ki\u1ec3u l\u01b0u tr\u1eef n\u00e0y th\u00edch h\u1ee3p v\u1edbi c\u00e1c t\u00e1c v\u1ee5 ph\u00e2n t\u00edch v\u00e0 x\u1eed l\u00fd d\u1eef li\u1ec7u l\u1edbn.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>\u01afu \u0111i\u1ec3m<\/b><span style=\"font-weight: 400;\">: T\u1ed1i \u01b0u cho x\u1eed l\u00fd d\u1eef li\u1ec7u l\u1edbn v\u00e0 truy v\u1ea5n theo c\u1ed9t; hi\u1ec7u n\u0103ng t\u1ed1t khi m\u1edf r\u1ed9ng.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Nh\u01b0\u1ee3c \u0111i\u1ec3m<\/b><span style=\"font-weight: 400;\">: Kh\u00f3 kh\u0103n trong vi\u1ec7c c\u1eadp nh\u1eadt d\u1eef li\u1ec7u th\u01b0\u1eddng xuy\u00ean; kh\u00f4ng ph\u00f9 h\u1ee3p cho d\u1eef li\u1ec7u c\u00f3 m\u1ed1i quan h\u1ec7 ph\u1ee9c t\u1ea1p.<\/span><\/li>\n<\/ul>\n<p><b>\u1ee8ng d\u1ee5ng:<\/b><span style=\"font-weight: 400;\"> H\u1ec7 th\u1ed1ng ph\u00e2n t\u00edch d\u1eef li\u1ec7u l\u1edbn, d\u1eef li\u1ec7u th\u1eddi gian th\u1ef1c.<\/span><\/p>\n<p><b>V\u00ed d\u1ee5:<\/b><span style=\"font-weight: 400;\"> Apache Cassandra, HBase.<\/span><\/p>\n<h4><b>4. Graph Database<\/b><\/h4>\n<p><span style=\"font-weight: 400;\">C\u01a1 s\u1edf d\u1eef li\u1ec7u n\u00e0y t\u1eadp trung v\u00e0o vi\u1ec7c l\u01b0u tr\u1eef v\u00e0 qu\u1ea3n l\u00fd c\u00e1c m\u1ed1i quan h\u1ec7 ph\u1ee9c t\u1ea1p gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng. N\u00f3 s\u1eed d\u1ee5ng c\u00e1c n\u00fat (nodes) \u0111\u1ec3 bi\u1ec3u th\u1ecb th\u1ef1c th\u1ec3 v\u00e0 c\u1ea1nh (edges) \u0111\u1ec3 bi\u1ec3u th\u1ecb m\u1ed1i quan h\u1ec7 gi\u1eefa ch\u00fang.<\/span><\/p>\n<ul>\n<li aria-level=\"1\"><b>\u01afu \u0111i\u1ec3m: <\/b><span style=\"font-weight: 400;\">T\u1ed1i \u01b0u cho d\u1eef li\u1ec7u c\u00f3 m\u1ed1i quan h\u1ec7 ph\u1ee9c t\u1ea1p; truy v\u1ea5n m\u1ed1i quan h\u1ec7 nhanh v\u00e0 linh ho\u1ea1t.<\/span><\/li>\n<\/ul>\n<ul>\n<li aria-level=\"1\"><b>Nh\u01b0\u1ee3c \u0111i\u1ec3m: <\/b><span style=\"font-weight: 400;\">Kh\u00f3 m\u1edf r\u1ed9ng theo chi\u1ec1u ngang; kh\u00f4ng ph\u00f9 h\u1ee3p cho d\u1eef li\u1ec7u d\u1ea1ng b\u1ea3ng ho\u1eb7c t\u00e0i li\u1ec7u.<\/span><\/li>\n<\/ul>\n<p><b>\u1ee8ng d\u1ee5ng:<\/b><span style=\"font-weight: 400;\"> M\u1ea1ng x\u00e3 h\u1ed9i, h\u1ec7 th\u1ed1ng khuy\u1ebfn ngh\u1ecb, ph\u00e2n t\u00edch m\u1ea1ng l\u01b0\u1edbi.<\/span><\/p>\n<p><b>V\u00ed d\u1ee5:<\/b><span style=\"font-weight: 400;\"> Neo4j, OrientDB.<\/span><\/p>\n<h3><b>C\u00e1ch ph\u00e2n bi\u1ec7t c\u01a1 s\u1edf d\u1eef li\u1ec7u Column-Family v\u00e0 Key-Value?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">C\u01a1 s\u1edf d\u1eef li\u1ec7u Key-Value v\u00e0 Column-Family \u0111\u1ec1u thu\u1ed9c nh\u00f3m NoSQL, nh\u01b0ng ch\u00fang c\u00f3 c\u1ea5u tr\u00fac d\u1eef li\u1ec7u, c\u00e1ch l\u01b0u tr\u1eef v\u00e0 \u1ee9ng d\u1ee5ng kh\u00e1c nhau.<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><b>Ti\u00eau ch\u00ed<\/b><\/td>\n<td><b>Key-value<\/b><\/td>\n<td><b>Column-Family<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">C\u1ea5u tr\u00fac d\u1eef li\u1ec7u<\/span><\/td>\n<td><span style=\"font-weight: 400;\">D\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef d\u01b0\u1edbi d\u1ea1ng c\u1eb7p key (kh\u00f3a) v\u00e0 value (gi\u00e1 tr\u1ecb):<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Key<\/b><span style=\"font-weight: 400;\">: L\u00e0 \u0111\u1ecbnh danh duy nh\u1ea5t, \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 truy c\u1eadp gi\u00e1 tr\u1ecb t\u01b0\u01a1ng \u1ee9ng.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Value<\/b><span style=\"font-weight: 400;\">: C\u00f3 th\u1ec3 l\u00e0 b\u1ea5t k\u1ef3 ki\u1ec3u d\u1eef li\u1ec7u n\u00e0o (v\u0103n b\u1ea3n, JSON, nh\u1ecb ph\u00e2n,..).<\/span><\/li>\n<\/ul>\n<\/td>\n<td><span style=\"font-weight: 400;\">D\u1eef li\u1ec7u \u0111\u01b0\u1ee3c t\u1ed5 ch\u1ee9c th\u00e0nh c\u00e1c h\u00e0ng (row) v\u00e0 c\u1ed9t (column), v\u1edbi c\u00e1c c\u1ed9t \u0111\u01b0\u1ee3c nh\u00f3m l\u1ea1i column families v\u1edbi:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">M\u1ed7i h\u00e0ng c\u00f3 m\u1ed9t key (kh\u00f3a h\u00e0ng) duy nh\u1ea5t.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">C\u00e1c gi\u00e1 tr\u1ecb trong c\u00f9ng m\u1ed9t h\u00e0ng c\u00f3 th\u1ec3 linh ho\u1ea1t v\u1ec1 s\u1ed1 l\u01b0\u1ee3ng v\u00e0 ki\u1ec3u c\u1ed9t.<\/span><\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">V\u00ed d\u1ee5<\/span><\/td>\n<td><span style=\"font-weight: 400;\">&#8220;user123&#8221;: {&#8220;name&#8221;: &#8220;Alice&#8221;, &#8220;age&#8221;: 25}<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Row Key: &#8220;user123&#8221;\u00a0\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Column Family: Personal_Info \u2192 {&#8220;name&#8221;: &#8220;Alice&#8221;, &#8220;age&#8221;: 25}\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Column Family: Address \u2192 {&#8220;city&#8221;: &#8220;Hanoi&#8221;, &#8220;country&#8221;: &#8220;Vietnam&#8221;}<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">C\u00e1ch ho\u1ea1t \u0111\u1ed9ng<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Khi c\u1ea7n truy xu\u1ea5t d\u1eef li\u1ec7u, ng\u01b0\u1eddi d\u00f9ng ch\u1ec9 c\u1ea7n cung c\u1ea5p kh\u00f3a (key) \u0111\u1ec3 l\u1ea5y gi\u00e1 tr\u1ecb (value) t\u01b0\u01a1ng \u1ee9ng. H\u1ec7 th\u1ed1ng kh\u00f4ng quan t\u00e2m \u0111\u1ebfn n\u1ed9i dung b\u00ean trong gi\u00e1 tr\u1ecb, do \u0111\u00f3 vi\u1ec7c truy v\u1ea5n ch\u1ec9 th\u1ef1c hi\u1ec7n \u0111\u01b0\u1ee3c theo kh\u00f3a.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">M\u1ed7i Column Family l\u00e0 m\u1ed9t nh\u00f3m c\u1ed9t c\u00f3 li\u00ean quan, \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef v\u00e0 truy v\u1ea5n c\u00f9ng nhau. D\u1eef li\u1ec7u c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c truy v\u1ea5n linh ho\u1ea1t d\u1ef1a tr\u00ean kh\u00f3a h\u00e0ng ho\u1eb7c c\u00e1c c\u1ed9t c\u1ee5 th\u1ec3.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">\u01afu \u0111i\u1ec3m\u00a0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">&#8211; <\/span><b>\u0110\u01a1n gi\u1ea3n v\u00e0 nhanh ch\u00f3ng<\/b><span style=\"font-weight: 400;\">: Truy c\u1eadp d\u1eef li\u1ec7u b\u1eb1ng kh\u00f3a n\u00ean r\u1ea5t hi\u1ec7u qu\u1ea3, ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c t\u00e1c v\u1ee5 y\u00eau c\u1ea7u t\u1ed1c \u0111\u1ed9 cao nh\u01b0 l\u01b0u tr\u1eef phi\u00ean (session) ho\u1eb7c d\u1eef li\u1ec7u t\u1ea1m (cache).<\/span><\/p>\n<p><span style=\"font-weight: 400;\">&#8211; <\/span><b>D\u1ec5 m\u1edf r\u1ed9ng<\/b><span style=\"font-weight: 400;\">: Thi\u1ebft k\u1ebf t\u1ed1i gi\u1ea3n gi\u00fap h\u1ec7 th\u1ed1ng d\u1ec5 d\u00e0ng m\u1edf r\u1ed9ng theo chi\u1ec1u ngang khi kh\u1ed1i l\u01b0\u1ee3ng d\u1eef li\u1ec7u t\u0103ng l\u00ean.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">&#8211; <\/span><b>Hi\u1ec7u qu\u1ea3 cho d\u1eef li\u1ec7u l\u1edbn<\/b><span style=\"font-weight: 400;\">: T\u1ed1i \u01b0u h\u00f3a cho vi\u1ec7c l\u01b0u tr\u1eef v\u00e0 truy xu\u1ea5t d\u1eef li\u1ec7u trong c\u00e1c h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">&#8211; <\/span><b>Truy v\u1ea5n linh ho\u1ea1t<\/b><span style=\"font-weight: 400;\">: H\u1ed7 tr\u1ee3 truy v\u1ea5n theo c\u1ed9t, gi\u00fap x\u1eed l\u00fd c\u00e1c t\u1eadp d\u1eef li\u1ec7u ph\u1ee9c t\u1ea1p hi\u1ec7u qu\u1ea3.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Nh\u01b0\u1ee3c \u0111i\u1ec3m<\/span><\/td>\n<td><b>&#8211; H\u1ea1n ch\u1ebf trong truy v\u1ea5n<\/b><span style=\"font-weight: 400;\">: Ch\u1ec9 c\u00f3 th\u1ec3 truy xu\u1ea5t d\u1eef li\u1ec7u theo kh\u00f3a, kh\u00f4ng th\u1ec3 t\u00ecm ki\u1ebfm d\u1ef1a tr\u00ean n\u1ed9i dung gi\u00e1 tr\u1ecb.<\/span><\/p>\n<p><b>&#8211; Kh\u00f4ng linh ho\u1ea1t<\/b><span style=\"font-weight: 400;\">: Thi\u1ebfu c\u00e1c t\u00ednh n\u0103ng ph\u1ee9c t\u1ea1p nh\u01b0 l\u1ecdc d\u1eef li\u1ec7u, l\u1eadp ch\u1ec9 m\u1ee5c (index), ho\u1eb7c ph\u00e2n t\u00edch d\u1ef1a tr\u00ean \u0111i\u1ec1u ki\u1ec7n.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">&#8211; Kh\u00f4ng ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c h\u1ec7 th\u1ed1ng c\u1ea7n truy v\u1ea5n ph\u1ee9c t\u1ea1p<\/span><\/td>\n<td><b>&#8211; Ph\u1ee9c t\u1ea1p h\u01a1n Key-value<\/b><span style=\"font-weight: 400;\">: Vi\u1ec7c thi\u1ebft k\u1ebf d\u1eef li\u1ec7u trong Column-Family y\u00eau c\u1ea7u hi\u1ec3u r\u00f5 c\u00e1ch t\u1ed5 ch\u1ee9c v\u00e0 s\u1eed d\u1ee5ng d\u1eef li\u1ec7u \u0111\u1ec3 \u0111\u1ea1t hi\u1ec7u qu\u1ea3 t\u1ed1i \u01b0u.<\/span><\/p>\n<p><b>&#8211; Qu\u1ea3n l\u00fd kh\u00f3 kh\u0103n h\u01a1n<\/b><span style=\"font-weight: 400;\">: H\u1ec7 th\u1ed1ng ph\u1ee9c t\u1ea1p \u0111\u00f2i h\u1ecfi \u0111\u1ed9i ng\u0169 k\u1ef9 thu\u1eadt c\u00f3 chuy\u00ean m\u00f4n cao.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">&#8211; Vi\u1ec7c tinh ch\u1ec9nh c\u1ea5u h\u00ecnh v\u00e0 t\u1ed1i \u01b0u hi\u1ec7u su\u1ea5t \u0111\u00f2i h\u1ecfi ki\u1ebfn th\u1ee9c chuy\u00ean s\u00e2u<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">\u1ee8ng d\u1ee5ng<\/span><\/td>\n<td><span style=\"font-weight: 400;\">&#8211; L\u01b0u tr\u1eef phi\u00ean ng\u01b0\u1eddi d\u00f9ng trong \u1ee9ng d\u1ee5ng web.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">&#8211; L\u01b0u tr\u1eef d\u1eef li\u1ec7u t\u1ea1m (cache) \u0111\u1ec3 t\u0103ng hi\u1ec7u su\u1ea5t.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">&#8211; H\u1ec7 th\u1ed1ng c\u1ea7n x\u1eed l\u00fd d\u1eef li\u1ec7u \u0111\u01a1n gi\u1ea3n v\u1edbi hi\u1ec7u su\u1ea5t cao.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">&#8211; H\u1ec7 th\u1ed1ng x\u1eed l\u00fd d\u1eef li\u1ec7u l\u1edbn, ph\u00e2n t\u00e1n (Big Data).<\/span><\/p>\n<p><span style=\"font-weight: 400;\">&#8211; \u1ee8ng d\u1ee5ng th\u1eddi gian th\u1ef1c nh\u01b0 theo d\u00f5i h\u00e0nh vi ng\u01b0\u1eddi d\u00f9ng, d\u1eef li\u1ec7u IoT (Internet of things).<\/span><\/p>\n<p><span style=\"font-weight: 400;\">&#8211; Ph\u00e2n t\u00edch d\u1eef li\u1ec7u ph\u1ee9c t\u1ea1p ho\u1eb7c l\u01b0u tr\u1eef l\u1ecbch s\u1eed.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">C\u00f4ng c\u1ee5<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Redis, DynamoDB (ch\u1ebf \u0111\u1ed9 Key-Value), Riak.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Cassandra, HBase.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><b>NoSQL kh\u00e1c bi\u1ec7t g\u00ec so v\u1edbi SQL?<\/b><\/h3>\n<table>\n<tbody>\n<tr>\n<td><b>Ti\u00eau ch\u00ed<\/b><\/td>\n<td><b>SQL (Relational Database)<\/b><\/td>\n<td><b>NoSQL (Non-Relational Database)<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">C\u1ea5u tr\u00fac d\u1eef li\u1ec7u<\/span><\/td>\n<td><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng b\u1ea3ng (table), c\u1ea7n schema c\u1ed1 \u0111\u1ecbnh.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">L\u01b0u tr\u1eef linh ho\u1ea1t: key-value, document, column, graph.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">T\u00ednh m\u1edf r\u1ed9ng<\/span><\/td>\n<td><span style=\"font-weight: 400;\">M\u1edf r\u1ed9ng theo chi\u1ec1u d\u1ecdc (vertical scaling) b\u1eb1ng c\u00e1ch n\u00e2ng c\u1ea5p ph\u1ea7n c\u1ee9ng (tuy nhi\u00ean PostgreSQL hay CockroachDB c\u0169ng h\u1ed7 tr\u1ee3 m\u1edf r\u1ed9ng theo chi\u1ec1u ngang trong m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p).<\/span><\/td>\n<td><span style=\"font-weight: 400;\">M\u1edf r\u1ed9ng theo chi\u1ec1u ngang (horizontal scaling) b\u1eb1ng c\u00e1ch th\u00eam nhi\u1ec1u m\u00e1y ch\u1ee7.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">H\u1ed7 tr\u1ee3 giao d\u1ecbch<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u0110\u1ea3m b\u1ea3o ACID (Atomicity, Consistency, Isolation, Durability).<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Tu\u00e2n th\u1ee7 BASE (Basically Available, Soft State, Eventually Consistent).<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Kh\u1ea3 n\u0103ng x\u1eed l\u00fd d\u1eef li\u1ec7u l\u1edbn<\/span><\/td>\n<td><span style=\"font-weight: 400;\">H\u1ea1n ch\u1ebf trong vi\u1ec7c x\u1eed l\u00fd d\u1eef li\u1ec7u phi c\u1ea5u tr\u00fac v\u00e0 kh\u1ed1i l\u01b0\u1ee3ng l\u1edbn.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Ph\u00f9 h\u1ee3p v\u1edbi d\u1eef li\u1ec7u phi c\u1ea5u tr\u00fac, b\u00e1n c\u1ea5u tr\u00fac v\u00e0 d\u1eef li\u1ec7u l\u1edbn.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Truy v\u1ea5n d\u1eef li\u1ec7u<\/span><\/td>\n<td><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng ng\u00f4n ng\u1eef SQL ti\u00eau chu\u1ea9n.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Truy v\u1ea5n th\u00f4ng qua API ho\u1eb7c c\u00e1c ng\u00f4n ng\u1eef c\u1ee5 th\u1ec3.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">\u1ee8ng d\u1ee5ng<\/span><\/td>\n<td><span style=\"font-weight: 400;\">H\u1ec7 th\u1ed1ng k\u1ebf to\u00e1n, ng\u00e2n h\u00e0ng, CRM.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">M\u1ea1ng x\u00e3 h\u1ed9i, \u1ee9ng d\u1ee5ng IoT, ph\u00e2n t\u00edch d\u1eef li\u1ec7u l\u1edbn.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<blockquote><p><span style=\"font-weight: 400;\">Ngo\u00e0i ra b\u1ea1n c\u00f3 th\u1ec3 t\u00ecm hi\u1ec3u chi ti\u1ebft h\u01a1n v\u1ec1 s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa <a href=\"https:\/\/itviec.com\/blog\/sql-vs-nosql\/\" target=\"_blank\" rel=\"noopener\">SQL vs NoSQL<\/a><\/span><span style=\"font-weight: 400;\">.<\/span><\/p><\/blockquote>\n<h3><b>Nh\u1eefng \u0111\u1eb7c \u0111i\u1ec3m n\u1ed5i b\u1eadt c\u1ee7a c\u00e1c c\u01a1 s\u1edf d\u1eef li\u1ec7u NoSQL l\u00e0 g\u00ec?<\/b><\/h3>\n<p><b>Kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng theo chi\u1ec1u ngang (Horizontal Scalability): <\/b><span style=\"font-weight: 400;\">C\u01a1 s\u1edf d\u1eef li\u1ec7u NoSQL cho ph\u00e9p th\u00eam c\u00e1c m\u00e1y ch\u1ee7 v\u00e0o h\u1ec7 th\u1ed1ng \u0111\u1ec3 t\u0103ng kh\u1ea3 n\u0103ng x\u1eed l\u00fd m\u00e0 kh\u00f4ng c\u1ea7n thay \u0111\u1ed5i c\u1ea5u tr\u00fac hi\u1ec7n c\u00f3.<\/span><\/p>\n<p><b>Kh\u1ea3 n\u0103ng l\u01b0u tr\u1eef d\u1eef li\u1ec7u phi c\u1ea5u tr\u00fac ho\u1eb7c b\u00e1n c\u1ea5u tr\u00fac: <\/b><span style=\"font-weight: 400;\">NoSQL h\u1ed7 tr\u1ee3 c\u00e1c lo\u1ea1i d\u1eef li\u1ec7u linh ho\u1ea1t nh\u01b0 JSON, XM, ho\u1eb7c t\u00e0i li\u1ec7u, ph\u00f9 h\u1ee3p v\u1edbi \u1ee9ng d\u1ee5ng kh\u00f4ng y\u00eau c\u1ea7u m\u00f4 h\u00ecnh d\u1eef li\u1ec7u c\u1ed1 \u0111\u1ecbnh.<\/span><\/p>\n<p><b>Hi\u1ec7u su\u1ea5t cao (High Performance): <\/b><span style=\"font-weight: 400;\">T\u1ed1i \u01b0u h\u00f3a cho c\u00e1c \u1ee9ng d\u1ee5ng y\u00eau c\u1ea7u x\u1eed l\u00fd nhanh v\u1edbi kh\u1ed1i l\u01b0\u1ee3ng l\u1edbn d\u1eef li\u1ec7u v\u00e0 truy c\u1eadp th\u01b0\u1eddng xuy\u00ean.<\/span><\/p>\n<p><b>H\u1ed7 tr\u1ee3 nhi\u1ec1u lo\u1ea1i m\u00f4 h\u00ecnh d\u1eef li\u1ec7u:\u00a0<\/b><\/p>\n<ul>\n<li><span style=\"font-weight: 400;\">D\u1eef li\u1ec7u d\u1ea1ng c\u1eb7p kh\u00f3a-gi\u00e1 tr\u1ecb (Key-Value Store)<\/span><\/li>\n<li><span style=\"font-weight: 400;\">D\u1eef li\u1ec7u d\u1ea1ng t\u00e0i li\u1ec7u (Document Store)<\/span><\/li>\n<li><span style=\"font-weight: 400;\">D\u1eef li\u1ec7u d\u1ea1ng \u0111\u1ed3 th\u1ecb (Graph Database)<\/span><\/li>\n<li><span style=\"font-weight: 400;\">D\u1eef li\u1ec7u d\u1ea1ng c\u1ed9t (Column-Family Store)<\/span><\/li>\n<\/ul>\n<p><b>T\u00ednh nh\u1ea5t qu\u00e1n linh ho\u1ea1t (Flexible Consistency): <\/b><span style=\"font-weight: 400;\">Cho ph\u00e9p t\u00f9y ch\u1ec9nh m\u1ee9c \u0111\u1ed9 \u0111\u1ea3m b\u1ea3o d\u1eef li\u1ec7u ch\u00ednh x\u00e1c. Ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 ch\u1ecdn gi\u1eefa t\u00ednh nh\u1ea5t qu\u00e1n cao (m\u1ecdi ng\u01b0\u1eddi \u0111\u1ec1u th\u1ea5y d\u1eef li\u1ec7u m\u1edbi ngay l\u1eadp t\u1ee9c) ho\u1eb7c t\u00ednh nh\u1ea5t qu\u00e1n cu\u1ed1i c\u00f9ng (d\u1eef li\u1ec7u s\u1ebd \u0111\u1ed3ng b\u1ed9 d\u1ea7n theo th\u1eddi gian), t\u00f9y v\u00e0o y\u00eau c\u1ea7u c\u1ee7a \u1ee9ng d\u1ee5ng.<\/span><\/p>\n<p><b>Kh\u1ea3 n\u0103ng x\u1eed l\u00fd kh\u1ed1i l\u01b0\u1ee3ng d\u1eef li\u1ec7u l\u1edbn (Big Data Ready): <\/b><span style=\"font-weight: 400;\">Th\u00edch h\u1ee3p cho c\u00e1c h\u1ec7 th\u1ed1ng l\u01b0u tr\u1eef v\u00e0 ph\u00e2n t\u00edch d\u1eef li\u1ec7u l\u1edbn nh\u01b0 m\u1ea1ng x\u00e3 h\u1ed9i, th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed v\u00e0 IoT (Internet of things).<\/span><\/p>\n<p><b>Kh\u00f4ng y\u00eau c\u1ea7u l\u01b0\u1ee3c \u0111\u1ed3 c\u1ed1 \u0111\u1ecbnh (Schema-less): <\/b><span style=\"font-weight: 400;\">Cho ph\u00e9p thay \u0111\u1ed5i c\u1ea5u tr\u00fac d\u1eef li\u1ec7u d\u1ec5 d\u00e0ng m\u00e0 kh\u00f4ng c\u1ea7n ph\u1ea3i ch\u1ec9nh s\u1eeda c\u01a1 s\u1edf d\u1eef li\u1ec7u to\u00e0n h\u1ec7 th\u1ed1ng.<\/span><\/p>\n<p><b>Kh\u1ea3 n\u0103ng ch\u1ecbu l\u1ed7i cao (Fault Tolerance): <\/b><span style=\"font-weight: 400;\">H\u1ec7 th\u1ed1ng t\u1ef1 \u0111\u1ed9ng sao l\u01b0u v\u00e0 chia nh\u1ecf d\u1eef li\u1ec7u ra nhi\u1ec1u ph\u1ea7n \u0111\u1ec3 b\u1ea3o v\u1ec7, gi\u00fap gi\u1ea3m nguy c\u01a1 m\u1ea5t m\u00e1t d\u1eef li\u1ec7u n\u1ebfu x\u1ea3y ra s\u1ef1 c\u1ed1.<\/span><\/p>\n<h3><b>CAP theorem l\u00e0 g\u00ec v\u00e0 vai tr\u00f2 c\u1ee7a n\u00f3 trong NoSQL?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">CAP Theorem (\u0111\u1ecbnh l\u00fd CAP) \u0111\u01b0\u1ee3c \u0111\u01b0a ra b\u1edfi Eric Brewer, m\u00f4 t\u1ea3 ba thu\u1ed9c t\u00ednh c\u01a1 b\u1ea3n c\u1ee7a m\u1ed9t h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Consistency (T\u00ednh nh\u1ea5t qu\u00e1n)<\/b><span style=\"font-weight: 400;\">: T\u1ea5t c\u1ea3 c\u00e1c n\u00fat trong h\u1ec7 th\u1ed1ng \u0111\u1ec1u th\u1ea5y c\u00f9ng m\u1ed9t d\u1eef li\u1ec7u t\u1ea1i c\u00f9ng m\u1ed9t th\u1eddi \u0111i\u1ec3m.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Availability (T\u00ednh s\u1eb5n s\u00e0ng)<\/b><span style=\"font-weight: 400;\">: H\u1ec7 th\u1ed1ng lu\u00f4n s\u1eb5n s\u00e0ng x\u1eed l\u00fd y\u00eau c\u1ea7u t\u1eeb ng\u01b0\u1eddi d\u00f9ng, b\u1ea5t k\u1ec3 c\u00f3 l\u1ed7i x\u1ea3y ra \u1edf m\u1ed9t s\u1ed1 n\u00fat.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Partition Tolerance (Kh\u1ea3 n\u0103ng ch\u1ecbu ph\u00e2n v\u00f9ng)<\/b><span style=\"font-weight: 400;\">: H\u1ec7 th\u1ed1ng v\u1eabn ho\u1ea1t \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng ngay c\u1ea3 khi c\u00e1c n\u00fat b\u1ecb chia c\u1eaft do l\u1ed7i m\u1ea1ng.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Theo \u0111\u1ecbnh l\u00fd CAP, trong m\u1ed9t h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n, ch\u1ec9 c\u00f3 th\u1ec3 \u0111\u1ea3m b\u1ea3o t\u1ed1i \u0111a hai hai trong ba thu\u1ed9c t\u00ednh c\u00f9ng m\u1ed9t l\u00fac v\u00e0 ph\u1ea3i ch\u1ea5p nh\u1eadn hy sinh thu\u1ed9c t\u00ednh c\u00f2n l\u1ea1i. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 nh\u1eefng \u0111\u00e1nh \u0111\u1ed5i (trade-off) ph\u1ed5 bi\u1ebfn:<\/span><\/p>\n<h4><b>CA (Consistency &amp; Availability)<\/b><\/h4>\n<p><span style=\"font-weight: 400;\">V\u00ed d\u1ee5: Redis khi ch\u1ea1y \u1edf ch\u1ebf \u0111\u1ed9 Standalone.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>L\u1ee3i \u00edch<\/b><span style=\"font-weight: 400;\">: \u0110\u1ea3m b\u1ea3o h\u1ec7 th\u1ed1ng lu\u00f4n nh\u1ea5t qu\u00e1n, c\u00e1c y\u00eau c\u1ea7u \u0111\u01b0\u1ee3c x\u1eed l\u00fd li\u00ean t\u1ee5c v\u00e0 ch\u00ednh x\u00e1c. Lu\u00f4n s\u1eb5n s\u00e0ng trong m\u00f4i tr\u01b0\u1eddng kh\u00f4ng c\u00f3 ph\u00e2n v\u00f9ng m\u1ea1ng, ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c h\u1ec7 th\u1ed1ng n\u1ed9i b\u1ed9 ho\u1eb7c m\u00f4i tr\u01b0\u1eddng nh\u1ecf g\u1ecdn.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Hy sinh (trade-off)<\/b><span style=\"font-weight: 400;\">: Kh\u00f4ng th\u1ec3 ch\u1ecbu \u0111\u01b0\u1ee3c l\u1ed7i ph\u00e2n v\u00f9ng m\u1ea1ng; khi x\u1ea3y ra l\u1ed7i m\u1ea1ng, h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 ng\u1eebng ho\u1ea1t \u0111\u1ed9ng.<\/span><\/li>\n<\/ul>\n<h4><b>CP (Consistency &amp; Partition Tolerance)<\/b><\/h4>\n<p><span style=\"font-weight: 400;\">V\u00ed d\u1ee5: MongoDB khi ch\u1ea1y \u1edf ch\u1ebf \u0111\u1ed9 ph\u00e2n t\u00e1n.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>L\u1ee3i \u00edch<\/b><span style=\"font-weight: 400;\">: \u0110\u1ea3m b\u1ea3o t\u1ea5t c\u1ea3 c\u00e1c n\u00fat trong h\u1ec7 th\u1ed1ng lu\u00f4n c\u00f3 c\u00f9ng d\u1eef li\u1ec7u, \u0111\u1eb7c bi\u1ec7t quan tr\u1ecdng v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng y\u00eau c\u1ea7u t\u00ednh ch\u00ednh x\u00e1c cao, nh\u01b0 h\u1ec7 th\u1ed1ng t\u00e0i ch\u00ednh ho\u1eb7c qu\u1ea3n l\u00fd giao d\u1ecbch.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Hy sinh (Trade-off)<\/b><span style=\"font-weight: 400;\">: Gi\u1ea3m t\u00ednh s\u1eb5n s\u00e0ng khi x\u1ea3y ra l\u1ed7i m\u1ea1ng; n\u1ebfu m\u1ed9t s\u1ed1 n\u00fat kh\u00f4ng k\u1ebft n\u1ed1i \u0111\u01b0\u1ee3c, h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 t\u1eeb ch\u1ed1i x\u1eed l\u00fd y\u00eau c\u1ea7u \u0111\u1ec3 b\u1ea3o v\u1ec7 t\u00ednh nh\u1ea5t qu\u00e1n.<\/span><\/li>\n<\/ul>\n<h4><b>AP (Availability &amp; Partition Tolerance)<\/b><\/h4>\n<p><span style=\"font-weight: 400;\">Hy sinh m\u1ed9t ph\u1ea7n t\u00ednh nh\u1ea5t qu\u00e1n \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o h\u1ec7 th\u1ed1ng lu\u00f4n s\u1eb5n s\u00e0ng v\u00e0 ch\u1ecbu \u0111\u01b0\u1ee3c l\u1ed7i ph\u00e2n v\u00f9ng. V\u00ed d\u1ee5: Cassandra ho\u1eb7c DynamoDB.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>L\u1ee3i \u00edch<\/b><span style=\"font-weight: 400;\">: \u0110\u1ea3m b\u1ea3o h\u1ec7 th\u1ed1ng lu\u00f4n ph\u1ea3n h\u1ed3i c\u00e1c y\u00eau c\u1ea7u, ngay c\u1ea3 khi m\u1ed9t s\u1ed1 n\u00fat b\u1ecb ph\u00e2n v\u00f9ng ho\u1eb7c kh\u00f4ng \u0111\u1ed3ng b\u1ed9. Ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng y\u00eau c\u1ea7u hi\u1ec7u su\u1ea5t cao v\u00e0 \u0111\u1ed9 tr\u1ec5 th\u1ea5p, nh\u01b0 m\u1ea1ng x\u00e3 h\u1ed9i ho\u1eb7c th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Hy sinh (Trade-off)<\/b><span style=\"font-weight: 400;\">: T\u00ednh nh\u1ea5t qu\u00e1n c\u00f3 th\u1ec3 b\u1ecb \u1ea3nh h\u01b0\u1edfng, ngh\u0129a l\u00e0 c\u00e1c n\u00fat kh\u00e1c nhau trong h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 hi\u1ec3n th\u1ecb d\u1eef li\u1ec7u kh\u00f4ng gi\u1ed1ng nhau ngay l\u1eadp t\u1ee9c(nh\u1ea5t qu\u00e1n cu\u1ed1i c\u00f9ng &#8211; eventual consistency). V\u00ed d\u1ee5, n\u1ebfu b\u1ea1n c\u1eadp nh\u1eadt d\u1eef li\u1ec7u \u1edf m\u1ed9t n\u00fat, n\u00fat kh\u00e1c c\u00f3 th\u1ec3 ch\u01b0a th\u1ea5y thay \u0111\u1ed5i \u0111\u00f3 ngay m\u00e0 c\u1ea7n th\u00eam th\u1eddi gian \u0111\u1ec3 \u0111\u1ed3ng b\u1ed9 h\u00f3a.<\/span><\/li>\n<\/ul>\n<h4><b>Vai tr\u00f2 c\u1ee7a CAP theorem trong NoSQL<\/b><\/h4>\n<p><span style=\"font-weight: 400;\">CAP Theorem \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c \u0111\u1ecbnh h\u01b0\u1edbng thi\u1ebft k\u1ebf v\u00e0 l\u1ef1a ch\u1ecdn c\u01a1 s\u1edf d\u1eef li\u1ec7u NoSQL cho c\u00e1c h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n. B\u1eb1ng c\u00e1ch n\u00eau r\u00f5 gi\u1edbi h\u1ea1n c\u1ee7a m\u1ed9t h\u1ec7 th\u1ed1ng trong vi\u1ec7c \u0111\u1ea1t \u0111\u01b0\u1ee3c c\u1ea3 t\u00ednh nh\u1ea5t qu\u00e1n (Consistency), t\u00ednh s\u1eb5n s\u00e0ng (Availability) v\u00e0 kh\u1ea3 n\u0103ng ch\u1ecbu ph\u00e2n v\u00f9ng (Partition Tolerance) c\u00f9ng l\u00fac, \u0111\u1ecbnh l\u00fd n\u00e0y gi\u00fap l\u1eadp tr\u00ecnh vi\u00ean hi\u1ec3u r\u00f5 c\u00e1c \u01b0u ti\u00ean c\u1ea7n c\u00e2n nh\u1eafc khi x\u00e2y d\u1ef1ng \u1ee9ng d\u1ee5ng.<\/span><\/p>\n<p><b>\u0110\u1ecbnh h\u00ecnh ki\u1ebfn tr\u00fac h\u1ec7 th\u1ed1ng NoSQL<\/b><span style=\"font-weight: 400;\">: NoSQL th\u01b0\u1eddng t\u1eadp trung v\u00e0o Partition Tolerance (PT) v\u00ec c\u00e1c h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n c\u1ea7n \u0111\u1ea3m b\u1ea3o kh\u1ea3 n\u0103ng ho\u1ea1t \u0111\u1ed9ng ngay c\u1ea3 khi g\u1eb7p s\u1ef1 c\u1ed1 m\u1ea1ng. T\u00f9y v\u00e0o m\u1ee5c ti\u00eau c\u1ee7a \u1ee9ng d\u1ee5ng, NoSQL c\u00f3 th\u1ec3 ch\u1ecdn \u01b0u ti\u00ean:<\/span><\/p>\n<ul>\n<li><b>AP (Availability + Partition Tolerance):<\/b><span style=\"font-weight: 400;\"> \u0110\u00e1p \u1ee9ng y\u00eau c\u1ea7u v\u1ec1 hi\u1ec7u su\u1ea5t v\u00e0 kh\u1ea3 n\u0103ng s\u1eb5n s\u00e0ng cao, nh\u01b0 trong c\u00e1c h\u1ec7 th\u1ed1ng th\u1eddi gian th\u1ef1c (Cassandra, DynamoDB).<\/span><\/li>\n<li><b>CP (Consistency + Partition Tolerance):<\/b><span style=\"font-weight: 400;\"> \u0110\u1ea3m b\u1ea3o t\u00ednh ch\u00ednh x\u00e1c c\u1ee7a d\u1eef li\u1ec7u, ph\u00f9 h\u1ee3p cho c\u00e1c h\u1ec7 th\u1ed1ng t\u00e0i ch\u00ednh ho\u1eb7c \u1ee9ng d\u1ee5ng c\u1ea7n t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u (MongoDB, HBase).<\/span><\/li>\n<\/ul>\n<p><b>T\u1ed1i \u01b0u h\u00f3a theo nhu c\u1ea7u c\u1ee7a \u1ee9ng d\u1ee5ng<\/b><span style=\"font-weight: 400;\">: CAP gi\u00fap l\u1eadp tr\u00ecnh vi\u00ean hi\u1ec3u r\u00f5 nh\u1eefng \u0111\u00e1nh \u0111\u1ed5i c\u1ea7n thi\u1ebft. Ch\u1eb3ng h\u1ea1n, c\u00e1c \u1ee9ng d\u1ee5ng m\u1ea1ng x\u00e3 h\u1ed9i c\u00f3 th\u1ec3 ch\u1ea5p nh\u1eadn nh\u1ea5t qu\u00e1n cu\u1ed1i c\u00f9ng (eventual consistency) \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c t\u1ed1c \u0111\u1ed9 v\u00e0 t\u00ednh s\u1eb5n s\u00e0ng cao, trong khi c\u00e1c \u1ee9ng d\u1ee5ng ng\u00e2n h\u00e0ng \u01b0u ti\u00ean t\u00ednh nh\u1ea5t qu\u00e1n m\u1ea1nh.<\/span><\/p>\n<p><b>Gi\u00fap l\u1ef1a ch\u1ecdn c\u01a1 s\u1edf d\u1eef li\u1ec7u ph\u00f9 h\u1ee3p<\/b><span style=\"font-weight: 400;\">: CAP Theorem gi\u00fap ph\u00e2n lo\u1ea1i v\u00e0 ch\u1ecdn NoSQL d\u1ef1a tr\u00ean c\u00e1c y\u00eau c\u1ea7u c\u1ee5 th\u1ec3 c\u1ee7a h\u1ec7 th\u1ed1ng, \u0111\u1ea3m b\u1ea3o r\u1eb1ng ki\u1ebfn tr\u00fac h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng v\u00e0 \u0111\u00e1p \u1ee9ng t\u1ed1t c\u00e1c t\u00ecnh hu\u1ed1ng l\u1ed7i.<\/span><\/p>\n<h3><b>Trong NoSQL, t\u1ea1i sao BASE th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng thay cho ACID?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\"><strong>ACID<\/strong> l\u00e0 m\u1ed9t t\u1eadp h\u1ee3p c\u00e1c thu\u1ed9c t\u00ednh gi\u00fap \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 tin c\u1eady v\u00e0 t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a d\u1eef li\u1ec7u trong c\u00e1c h\u1ec7 th\u1ed1ng c\u01a1 s\u1edf d\u1eef li\u1ec7u truy\u1ec1n th\u1ed1ng (nh\u01b0 RDBMS). C\u00e1c thu\u1ed9c t\u00ednh bao g\u1ed3m:<\/span><\/p>\n<ol>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Atomicity (Nguy\u00ean t\u1eed)<\/b><span style=\"font-weight: 400;\">: M\u1ed9t giao d\u1ecbch \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n ho\u00e0n to\u00e0n ho\u1eb7c kh\u00f4ng th\u1ef1c hi\u1ec7n g\u00ec c\u1ea3. Kh\u00f4ng c\u00f3 tr\u1ea1ng th\u00e1i trung gian.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><i><span style=\"font-weight: 400;\">V\u00ed d\u1ee5<\/span><\/i><span style=\"font-weight: 400;\">: N\u1ebfu m\u1ed9t giao d\u1ecbch ng\u00e2n h\u00e0ng chuy\u1ec3n ti\u1ec1n t\u1eeb t\u00e0i kho\u1ea3n A sang B th\u1ea5t b\u1ea1i, s\u1ed1 ti\u1ec1n s\u1ebd kh\u00f4ng b\u1ecb tr\u1eeb \u1edf t\u00e0i kho\u1ea3n A.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Consistency (Nh\u1ea5t qu\u00e1n)<\/b><span style=\"font-weight: 400;\">: D\u1eef li\u1ec7u ph\u1ea3i lu\u00f4n tu\u00e2n theo c\u00e1c quy t\u1eafc r\u00e0ng bu\u1ed9c (constraints). Sau m\u1ed7i giao d\u1ecbch, h\u1ec7 th\u1ed1ng chuy\u1ec3n d\u1eef li\u1ec7u t\u1eeb tr\u1ea1ng th\u00e1i nh\u1ea5t qu\u00e1n n\u00e0y sang tr\u1ea1ng th\u00e1i nh\u1ea5t qu\u00e1n kh\u00e1c.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Isolation (C\u00e1ch ly)<\/b><span style=\"font-weight: 400;\">: C\u00e1c giao d\u1ecbch \u0111\u1ed3ng th\u1eddi kh\u00f4ng \u0111\u01b0\u1ee3c \u1ea3nh h\u01b0\u1edfng l\u1eabn nhau.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><i><span style=\"font-weight: 400;\">V\u00ed d\u1ee5<\/span><\/i><span style=\"font-weight: 400;\">: Hai giao d\u1ecbch \u0111\u1ecdc v\u00e0 ghi d\u1eef li\u1ec7u ph\u1ea3i ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ec3 ch\u00fang \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n tu\u1ea7n t\u1ef1.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Durability (B\u1ec1n v\u1eefng)<\/b><span style=\"font-weight: 400;\">: Sau khi giao d\u1ecbch ho\u00e0n t\u1ea5t, d\u1eef li\u1ec7u s\u1ebd \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef v\u0129nh vi\u1ec5n, b\u1ea5t k\u1ec3 s\u1ef1 c\u1ed1 x\u1ea3y ra.<\/span><\/li>\n<\/ol>\n<p><span style=\"font-weight: 400;\"><strong>BASE<\/strong> l\u00e0 m\u1ed9t m\u00f4 h\u00ecnh kh\u00e1c, th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng trong NoSQL, ph\u00f9 h\u1ee3p h\u01a1n v\u1edbi c\u00e1c h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n v\u00e0 y\u00eau c\u1ea7u kh\u1ed1i l\u01b0\u1ee3ng d\u1eef li\u1ec7u l\u1edbn. BASE bao g\u1ed3m:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Basically Available (S\u1eb5n s\u00e0ng c\u01a1 b\u1ea3n)<\/b><span style=\"font-weight: 400;\">: H\u1ec7 th\u1ed1ng lu\u00f4n s\u1eb5n s\u00e0ng ph\u1ee5c v\u1ee5, ngay c\u1ea3 khi c\u00f3 l\u1ed7i x\u1ea3y ra ho\u1eb7c m\u1ed9t ph\u1ea7n c\u1ee7a h\u1ec7 th\u1ed1ng b\u1ecb m\u1ea5t k\u1ebft n\u1ed1i. H\u1ec7 th\u1ed1ng \u01b0u ti\u00ean v\u1ec1 kh\u1ea3 n\u0103ng ph\u1ea3n h\u1ed3i nhanh nh\u1ea5t c\u00f3 th\u1ec3, tuy nhi\u00ean kh\u00f4ng \u0111\u1ea3m b\u1ea3o t\u1ea5t c\u1ea3 y\u00eau c\u1ea7u \u0111\u1ec1u th\u00e0nh c\u00f4ng.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Soft State (Tr\u1ea1ng th\u00e1i t\u1ea1m th\u1eddi)<\/b><span style=\"font-weight: 400;\">: D\u1eef li\u1ec7u c\u00f3 th\u1ec3 thay \u0111\u1ed5i theo th\u1eddi gian do qu\u00e1 tr\u00ecnh \u0111\u1ed3ng b\u1ed9 h\u00f3a gi\u1eefa c\u00e1c n\u00fat trong h\u1ec7 th\u1ed1ng, ngay c\u1ea3 khi kh\u00f4ng c\u00f3 y\u00eau c\u1ea7u ch\u1ec9nh s\u1eeda n\u00e0o.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Eventual Consistency (Nh\u1ea5t qu\u00e1n cu\u1ed1i c\u00f9ng)<\/b><span style=\"font-weight: 400;\">: D\u1eef li\u1ec7u s\u1ebd tr\u1edf n\u00ean nh\u1ea5t qu\u00e1n sau m\u1ed9t kho\u1ea3ng th\u1eddi gian, nh\u01b0ng kh\u00f4ng \u0111\u1ea3m b\u1ea3o t\u00ednh nh\u1ea5t qu\u00e1n ngay l\u1eadp t\u1ee9c.<\/span><\/li>\n<\/ul>\n<h4><b>T\u1ea1i sao NoSQL ch\u1ecdn BASE thay v\u00ec ACID?<\/b><\/h4>\n<table>\n<tbody>\n<tr>\n<td><strong>Ti\u00eau ch\u00ed<\/strong><\/td>\n<td><strong>BASE<\/strong><\/td>\n<td><strong>ACID<\/strong><\/td>\n<\/tr>\n<tr>\n<td><strong>Hi\u1ec7u su\u1ea5t v\u00e0 kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng<\/strong><\/td>\n<td><span style=\"font-weight: 400;\">BASE ch\u1ea5p nh\u1eadn t\u00ednh nh\u1ea5t qu\u00e1n cu\u1ed1i c\u00f9ng \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o h\u1ec7 th\u1ed1ng lu\u00f4n ho\u1ea1t \u0111\u1ed9ng nhanh v\u00e0 x\u1eed l\u00fd kh\u1ed1i l\u01b0\u1ee3ng d\u1eef li\u1ec7u l\u1edbn trong th\u1eddi gian th\u1ef1c. BASE h\u1ed7 tr\u1ee3 m\u1edf r\u1ed9ng theo chi\u1ec1u ngang (horizontal scaling), t\u1ee9c l\u00e0 b\u1ed5 sung th\u00eam nhi\u1ec1u m\u00e1y ch\u1ee7 (nodes), gi\u00fap h\u1ec7 th\u1ed1ng d\u1ec5 d\u00e0ng m\u1edf r\u1ed9ng v\u00e0 ph\u00e2n ph\u1ed1i kh\u1ed1i l\u01b0\u1ee3ng l\u1edbn d\u1eef li\u1ec7u<\/span><\/td>\n<td><span style=\"font-weight: 400;\">ACID y\u00eau c\u1ea7u c\u00e1c giao d\u1ecbch ph\u1ea3i tu\u00e2n th\u1ee7 nguy\u00ean t\u1eafc nghi\u00eam ng\u1eb7t, \u0111i\u1ec1u n\u00e0y l\u00e0m gi\u1ea3m t\u1ed1c \u0111\u1ed9 x\u1eed l\u00fd trong c\u00e1c h\u1ec7 th\u1ed1ng l\u1edbn. ACID th\u01b0\u1eddng y\u00eau c\u1ea7u m\u1edf r\u1ed9ng theo chi\u1ec1u d\u1ecdc (vertical scaling), t\u1ee9c l\u00e0 n\u00e2ng c\u1ea5p ph\u1ea7n c\u1ee9ng nh\u01b0 CPU, RAM cho m\u1ed9t m\u00e1y ch\u1ee7<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong>T\u00ednh s\u1eb5n s\u00e0ng cao (High Availability)<\/strong><\/td>\n<td><span style=\"font-weight: 400;\">BASE \u01b0u ti\u00ean t\u00ednh s\u1eb5n s\u00e0ng, cho ph\u00e9p h\u1ec7 th\u1ed1ng x\u1eed l\u00fd y\u00eau c\u1ea7u ngay c\u1ea3 khi kh\u00f4ng th\u1ec3 \u0111\u1ea3m b\u1ea3o d\u1eef li\u1ec7u ho\u00e0n to\u00e0n nh\u1ea5t qu\u00e1n<\/span><\/td>\n<td><span style=\"font-weight: 400;\">ACID th\u01b0\u1eddng \u01b0u ti\u00ean t\u00ednh nh\u1ea5t qu\u00e1n h\u01a1n t\u00ednh s\u1eb5n s\u00e0ng, c\u00f3 ngh\u0129a l\u00e0 khi x\u1ea3y ra l\u1ed7i m\u1ea1ng ho\u1eb7c l\u1ed7i giao d\u1ecbch, h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 t\u1ea1m ng\u1eebng ho\u1ea1t \u0111\u1ed9ng<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong>Th\u00edch h\u1ee3p cho h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n<\/strong><\/td>\n<td><span style=\"font-weight: 400;\">BASE, v\u1edbi nh\u1ea5t qu\u00e1n cu\u1ed1i c\u00f9ng (eventual consistency), ph\u00f9 h\u1ee3p h\u01a1n cho c\u00e1c h\u1ec7 th\u1ed1ng c\u1ea7n x\u1eed l\u00fd d\u1eef li\u1ec7u tr\u00ean nhi\u1ec1u n\u00fat (nodes) v\u00e0 v\u00f9ng (regions).<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Ngo\u00e0i ra, c\u00e1c \u1ee9ng d\u1ee5ng nh\u01b0 m\u1ea1ng x\u00e3 h\u1ed9i, th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed, IoT th\u01b0\u1eddng y\u00eau c\u1ea7u t\u1ed1c \u0111\u1ed9 cao v\u00e0 kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng theo chi\u1ec1u ngang. BASE cho ph\u00e9p h\u1ec7 th\u1ed1ng x\u1eed l\u00fd h\u00e0ng tri\u1ec7u y\u00eau c\u1ea7u m\u00e0 kh\u00f4ng b\u1ecb ch\u1eadm tr\u1ec5<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Trong c\u00e1c h\u1ec7 th\u1ed1ng NoSQL ph\u00e2n t\u00e1n, vi\u1ec7c \u0111\u1ea3m b\u1ea3o t\u00ednh nh\u1ea5t qu\u00e1n m\u1ea1nh m\u1ebd (strong consistency) theo ACID l\u00e0 r\u1ea5t kh\u00f3 v\u00e0 t\u1ed1n k\u00e9m<\/span><\/td>\n<\/tr>\n<tr>\n<td><strong>Kh\u1ea3 n\u0103ng x\u1eed l\u00fd Big Data<\/strong><\/td>\n<td><span style=\"font-weight: 400;\">BASE \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 x\u1eed l\u00fd Big Data m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3 b\u1eb1ng c\u00e1ch ch\u1ea5p nh\u1eadn \u0111\u1ed9 tr\u1ec5 trong t\u00ednh nh\u1ea5t qu\u00e1n v\u00e0 t\u1eadp trung v\u00e0o vi\u1ec7c ph\u00e2n ph\u1ed1i v\u00e0 l\u01b0u tr\u1eef d\u1eef li\u1ec7u theo t\u1eebng ph\u1ea7n, gi\u00fap h\u1ec7 th\u1ed1ng \u0111\u1ea1t hi\u1ec7u su\u1ea5t cao v\u00e0 kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng linh ho\u1ea1t<\/span><\/td>\n<td><span style=\"font-weight: 400;\">ACID g\u1eb7p h\u1ea1n ch\u1ebf trong vi\u1ec7c x\u1eed l\u00fd kh\u1ed1i l\u01b0\u1ee3ng l\u1edbn d\u1eef li\u1ec7u do y\u00eau c\u1ea7u giao d\u1ecbch ph\u1ea3i \u0111\u1ea3m b\u1ea3o to\u00e0n v\u1eb9n v\u00e0 ch\u00ednh x\u00e1c trong t\u1eebng b\u01b0\u1edbc. \u0110i\u1ec1u n\u00e0y khi\u1ebfn c\u00e1c h\u1ec7 th\u1ed1ng ACID kh\u00f3 m\u1edf r\u1ed9ng khi d\u1eef li\u1ec7u ph\u00e1t tri\u1ec3n qu\u00e1 nhanh.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"font-weight: 400;\">Trong NoSQL, c\u00e1c thu\u1ed9c t\u00ednh ACID th\u01b0\u1eddng kh\u00f4ng \u0111\u01b0\u1ee3c \u0111\u1ea3m b\u1ea3o \u0111\u1ea7y \u0111\u1ee7 do t\u00ednh ch\u1ea5t ph\u00e2n t\u00e1n v\u00e0 nhu c\u1ea7u t\u1ed1i \u01b0u hi\u1ec7u su\u1ea5t. Tuy nhi\u00ean, m\u1ed9t s\u1ed1 c\u01a1 s\u1edf d\u1eef li\u1ec7u NoSQL v\u1eabn \u00e1p d\u1ee5ng m\u1ed9t ph\u1ea7n ho\u1eb7c cung c\u1ea5p t\u00ednh n\u0103ng t\u01b0\u01a1ng t\u1ef1 ACID, t\u00f9y thu\u1ed9c v\u00e0o lo\u1ea1i v\u00e0 c\u00e1ch tri\u1ec3n khai.<\/span><\/p>\n<h3><b>Eventual Consistency l\u00e0 g\u00ec?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Eventual Consistency (Nh\u1ea5t qu\u00e1n cu\u1ed1i c\u00f9ng) l\u00e0 m\u1ed9t m\u00f4 h\u00ecnh nh\u1ea5t qu\u00e1n trong h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n, trong \u0111\u00f3 d\u1eef li\u1ec7u s\u1ebd \u0111\u1ed3ng b\u1ed9 tr\u00ean t\u1ea5t c\u1ea3 c\u00e1c n\u00fat sau m\u1ed9t kho\u1ea3ng th\u1eddi gian nh\u1ea5t \u0111\u1ecbnh n\u1ebfu kh\u00f4ng c\u00f3 th\u00eam thay \u0111\u1ed5i n\u00e0o x\u1ea3y ra. Tuy nhi\u00ean, trong th\u1eddi gian \u0111\u1ed3ng b\u1ed9, c\u00e1c n\u00fat c\u00f3 th\u1ec3 ch\u1ee9a d\u1eef li\u1ec7u kh\u00f4ng nh\u1ea5t qu\u00e1n t\u1ea1m th\u1eddi, m\u1ed9t s\u1ed1 y\u00eau c\u1ea7u v\u1eabn s\u1ebd tr\u1ea3 v\u1ec1 gi\u00e1 tr\u1ecb c\u0169 thay v\u00ec gi\u00e1 tr\u1ecb m\u1edbi \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u00e2y l\u00e0 c\u00e1ch m\u00e0 nhi\u1ec1u c\u01a1 s\u1edf d\u1eef li\u1ec7u NoSQL ch\u1ecdn \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o hi\u1ec7u su\u1ea5t cao v\u00e0 t\u00ednh s\u1eb5n s\u00e0ng, hy sinh t\u00ednh nh\u1ea5t qu\u00e1n m\u1ea1nh (strong consistency).<\/span><\/p>\n<p><span style=\"font-weight: 400;\">V\u00ed d\u1ee5 khi b\u1ea1n \u0111\u0103ng m\u1ed9t b\u00e0i vi\u1ebft l\u00ean Facebook th\u00ec ngay l\u1eadp t\u1ee9c, b\u1ea1n c\u00f3 th\u1ec3 th\u1ea5y b\u00e0i vi\u1ebft xu\u1ea5t hi\u1ec7n tr\u00ean d\u00f2ng th\u1eddi gian c\u1ee7a m\u00ecnh. Tuy nhi\u00ean, b\u1ea1n b\u00e8 c\u1ee7a b\u1ea1n c\u00f3 th\u1ec3 kh\u00f4ng nh\u00ecn th\u1ea5y b\u00e0i vi\u1ebft \u0111\u00f3 ngay l\u1eadp t\u1ee9c v\u00ec:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Khi b\u1ea1n \u0111\u0103ng b\u00e0i vi\u1ebft, d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u01b0u tr\u00ean m\u1ed9t m\u00e1y ch\u1ee7 ch\u00ednh (primary node).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">M\u00e1y ch\u1ee7 n\u00e0y b\u1eaft \u0111\u1ea7u truy\u1ec1n b\u1ea3n sao c\u1ee7a b\u00e0i vi\u1ebft \u0111\u1ebfn c\u00e1c n\u00fat kh\u00e1c (replica nodes).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Trong th\u1eddi gian truy\u1ec1n t\u1ea3i, n\u1ebfu b\u1ea1n b\u00e8 c\u1ee7a b\u1ea1n truy c\u1eadp, h\u1ecd c\u00f3 th\u1ec3 kh\u00f4ng th\u1ea5y b\u00e0i vi\u1ebft (d\u1eef li\u1ec7u ch\u01b0a \u0111\u1ed3ng b\u1ed9).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Sau m\u1ed9t th\u1eddi gian ng\u1eafn, khi qu\u00e1 tr\u00ecnh \u0111\u1ed3ng b\u1ed9 ho\u00e0n t\u1ea5t, t\u1ea5t c\u1ea3 c\u00e1c n\u00fat s\u1ebd hi\u1ec3n th\u1ecb b\u00e0i vi\u1ebft c\u1ee7a b\u1ea1n.<\/span><\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Cac_cau_hoi_phong_van_NoSQL_ve_quan_ly_va_luu_tru_du_lieu\"><\/span><b>C\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NoSQL v\u1ec1 qu\u1ea3n l\u00fd v\u00e0 l\u01b0u tr\u1eef d\u1eef li\u1ec7u<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><b>CRUD trong NoSQL l\u00e0 g\u00ec v\u00e0 kh\u00e1c g\u00ec so v\u1edbi CRUD trong SQL?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\"><strong>CRUD<\/strong> l\u00e0 vi\u1ebft t\u1eaft c\u1ee7a c\u00e1c thao t\u00e1c c\u01a1 b\u1ea3n trong qu\u1ea3n l\u00fd d\u1eef li\u1ec7u:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Create (T\u1ea1o d\u1eef li\u1ec7u): Th\u00eam d\u1eef li\u1ec7u m\u1edbi v\u00e0o c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Read (\u0110\u1ecdc d\u1eef li\u1ec7u): Truy xu\u1ea5t d\u1eef li\u1ec7u t\u1eeb c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Update (C\u1eadp nh\u1eadt d\u1eef li\u1ec7u): Thay \u0111\u1ed5i d\u1eef li\u1ec7u hi\u1ec7n c\u00f3.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Delete (X\u00f3a d\u1eef li\u1ec7u): Lo\u1ea1i b\u1ecf d\u1eef li\u1ec7u kh\u1ecfi c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/span><b><\/b><\/li>\n<\/ul>\n<table>\n<tbody>\n<tr>\n<td><b>Ti\u00eau ch\u00ed<\/b><\/td>\n<td><b>CRUD trong SQL<\/b><\/td>\n<td><b>CRUD trong NoSQL<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">C\u1ea5u tr\u00fac d\u1eef li\u1ec7u<\/span><\/td>\n<td><span style=\"font-weight: 400;\">C\u1ea7n tu\u00e2n theo l\u01b0\u1ee3c \u0111\u1ed3 (schema).<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Kh\u00f4ng y\u00eau c\u1ea7u l\u01b0\u1ee3c \u0111\u1ed3 c\u1ed1 \u0111\u1ecbnh, h\u1ed7 tr\u1ee3 d\u1eef li\u1ec7u phi c\u1ea5u tr\u00fac.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">T\u1ea1o d\u1eef li\u1ec7u<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Y\u00eau c\u1ea7u \u0111\u1ecbnh ngh\u0129a r\u00f5 r\u00e0ng c\u00e1c c\u1ed9t v\u00e0 ki\u1ec3u d\u1eef li\u1ec7u tr\u01b0\u1edbc khi th\u00eam.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Linh ho\u1ea1t, c\u00f3 th\u1ec3 th\u00eam d\u1eef li\u1ec7u v\u1edbi c\u1ea5u tr\u00fac thay \u0111\u1ed5i theo th\u1eddi gian.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Truy v\u1ea5n d\u1eef li\u1ec7u<\/span><\/td>\n<td><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng ng\u00f4n ng\u1eef SQL v\u1edbi c\u00fa ph\u00e1p truy v\u1ea5n r\u00f5 r\u00e0ng.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Truy v\u1ea5n \u0111a d\u1ea1ng, ph\u1ee5 thu\u1ed9c v\u00e0o lo\u1ea1i NoSQL (JSON, key-value, graph).<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">C\u1eadp nh\u1eadt d\u1eef li\u1ec7u<\/span><\/td>\n<td><span style=\"font-weight: 400;\">C\u1ea7n tu\u00e2n th\u1ee7 l\u01b0\u1ee3c \u0111\u1ed3, c\u00f3 th\u1ec3 x\u1ea3y ra l\u1ed7i n\u1ebfu d\u1eef li\u1ec7u kh\u00f4ng h\u1ee3p l\u1ec7.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Linh ho\u1ea1t, kh\u00f4ng b\u1ecb r\u00e0ng bu\u1ed9c b\u1edfi c\u1ea5u tr\u00fac.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">X\u00f3a d\u1eef li\u1ec7u<\/span><\/td>\n<td><span style=\"font-weight: 400;\">X\u00f3a d\u1eef li\u1ec7u ngay l\u1eadp t\u1ee9c v\u00e0 \u0111\u1ed3ng b\u1ed9 h\u00f3a to\u00e0n b\u1ed9 b\u1ea3ng.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">C\u00f3 th\u1ec3 x\u00f3a v\u1edbi \u0111\u1ed9 tr\u1ec5, \u0111\u1eb7c bi\u1ec7t trong c\u00e1c h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng h\u1ea1n ch\u1ebf theo chi\u1ec1u d\u1ecdc.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">H\u1ed7 tr\u1ee3 m\u1edf r\u1ed9ng ngang, ph\u00f9 h\u1ee3p v\u1edbi kh\u1ed1i l\u01b0\u1ee3ng l\u1edbn d\u1eef li\u1ec7u.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">T\u00ednh nh\u1ea5t qu\u00e1n<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u0110\u1ea3m b\u1ea3o t\u00ednh nh\u1ea5t qu\u00e1n m\u1ea1nh (Strong Consistency) cho t\u1ea5t c\u1ea3 c\u00e1c thao t\u00e1c CRUD.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Ch\u1ea5p nh\u1eadn nh\u1ea5t qu\u00e1n cu\u1ed1i c\u00f9ng (Eventual Consistency) trong h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n \u0111\u1ec3 t\u0103ng t\u1ed1c \u0111\u1ed9 x\u1eed l\u00fd.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"font-weight: 400;\"><strong>CRUD trong NoSQL<\/strong> linh ho\u1ea1t h\u01a1n so v\u1edbi SQL nh\u1edd t\u00ednh ch\u1ea5t kh\u00f4ng r\u00e0ng bu\u1ed9c l\u01b0\u1ee3c \u0111\u1ed3 v\u00e0 kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng cao. Tuy nhi\u00ean, \u0111i\u1ec1u n\u00e0y c\u0169ng \u0111\u1ed3ng ngh\u0129a v\u1edbi vi\u1ec7c ph\u1ea3i qu\u1ea3n l\u00fd c\u1ea9n th\u1eadn \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00ednh nh\u1ea5t qu\u00e1n v\u00e0 hi\u1ec7u qu\u1ea3 trong c\u00e1c h\u1ec7 th\u1ed1ng l\u1edbn.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">CRUD trong NoSQL \u0111\u1eb7c bi\u1ec7t ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng y\u00eau c\u1ea7u x\u1eed l\u00fd d\u1eef li\u1ec7u phi c\u1ea5u tr\u00fac ho\u1eb7c b\u00e1n c\u1ea5u tr\u00fac, nh\u01b0 m\u1ea1ng x\u00e3 h\u1ed9i, IoT (Internet of Things) v\u00e0 th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed.<\/span><\/p>\n<h3><b>Sharding l\u00e0 g\u00ec?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Sharding l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt ph\u00e2n m\u1ea3nh d\u1eef li\u1ec7u, trong \u0111\u00f3 d\u1eef li\u1ec7u l\u1edbn \u0111\u01b0\u1ee3c chia th\u00e0nh c\u00e1c ph\u1ea7n nh\u1ecf h\u01a1n g\u1ecdi l\u00e0 shard, v\u00e0 ph\u00e2n ph\u1ed1i tr\u00ean nhi\u1ec1u m\u00e1y ch\u1ee7 ho\u1eb7c n\u00fat trong m\u1ed9t h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n. M\u1ed7i shard ch\u1ee9a m\u1ed9t t\u1eadp h\u1ee3p con c\u1ee7a d\u1eef li\u1ec7u v\u00e0 ho\u1ea1t \u0111\u1ed9ng \u0111\u1ed9c l\u1eadp nh\u01b0 m\u1ed9t c\u01a1 s\u1edf d\u1eef li\u1ec7u ri\u00eang bi\u1ec7t. Tuy nhi\u00ean, khi k\u1ebft h\u1ee3p l\u1ea1i, c\u00e1c shard t\u1ea1o n\u00ean m\u1ed9t c\u01a1 s\u1edf d\u1eef li\u1ec7u logic duy nh\u1ea5t, mang l\u1ea1i kh\u1ea3 n\u0103ng x\u1eed l\u00fd d\u1eef li\u1ec7u l\u1edbn m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Sharding th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c c\u01a1 s\u1edf d\u1eef li\u1ec7u NoSQL nh\u01b0 MongoDB, Cassandra v\u00e0 HBase \u0111\u1ec3 qu\u1ea3n l\u00fd kh\u1ed1i l\u01b0\u1ee3ng d\u1eef li\u1ec7u l\u1edbn v\u00e0 \u0111\u00e1p \u1ee9ng c\u00e1c y\u00eau c\u1ea7u v\u1ec1 hi\u1ec7u su\u1ea5t v\u00e0 m\u1edf r\u1ed9ng.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">C\u00e1c th\u00e0nh ph\u1ea7n trong Sharding:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Shard<\/b><span style=\"font-weight: 400;\">: L\u00e0 m\u1ed9t ph\u1ea7n c\u1ee7a c\u01a1 s\u1edf d\u1eef li\u1ec7u t\u1ed5ng th\u1ec3, ch\u1ee9a m\u1ed9t t\u1eadp h\u1ee3p con c\u1ee7a d\u1eef li\u1ec7u. M\u1ed7i shard c\u00f3 th\u1ec3 n\u1eb1m tr\u00ean m\u1ed9t m\u00e1y ch\u1ee7 ri\u00eang l\u1ebb v\u00e0 d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c ph\u00e2n ph\u1ed1i d\u1ef1a tr\u00ean m\u1ed9t quy t\u1eafc nh\u1ea5t \u0111\u1ecbnh (shard key).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Shard Key<\/b><span style=\"font-weight: 400;\">: L\u00e0 m\u1ed9t thu\u1ed9c t\u00ednh ho\u1eb7c t\u1eadp h\u1ee3p thu\u1ed9c t\u00ednh trong d\u1eef li\u1ec7u d\u00f9ng \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh shard l\u01b0u tr\u1eef d\u1eef li\u1ec7u \u0111\u00f3. Shard key \u1ea3nh h\u01b0\u1edfng tr\u1ef1c ti\u1ebfp \u0111\u1ebfn c\u00e1ch d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c ph\u00e2n ph\u1ed1i v\u00e0 c\u00e2n b\u1eb1ng gi\u1eefa c\u00e1c shard.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Router (Query Router)<\/b><span style=\"font-weight: 400;\">: L\u00e0 th\u00e0nh ph\u1ea7n trung gian \u0111\u1ecbnh tuy\u1ebfn c\u00e1c truy v\u1ea5n c\u1ee7a ng\u01b0\u1eddi d\u00f9ng \u0111\u1ebfn \u0111\u00fang shard ch\u1ee9a d\u1eef li\u1ec7u li\u00ean quan.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Cluster<\/b><span style=\"font-weight: 400;\">: L\u00e0 t\u1eadp h\u1ee3p c\u00e1c m\u00e1y ch\u1ee7 ho\u1eb7c n\u00fat trong h\u1ec7 th\u1ed1ng, m\u1ed7i m\u00e1y ch\u1ee7 c\u00f3 th\u1ec3 ch\u1ee9a m\u1ed9t ho\u1eb7c nhi\u1ec1u shard.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Config Server<\/b><span style=\"font-weight: 400;\">: L\u00e0 m\u00e1y ch\u1ee7 ho\u1eb7c c\u1ee5m m\u00e1y ch\u1ee7 l\u01b0u tr\u1eef th\u00f4ng tin c\u1ea5u tr\u00fac c\u1ee7a shard, bao g\u1ed3m: v\u1ecb tr\u00ed c\u1ee7a t\u1eebng shard trong h\u1ec7 th\u1ed1ng, quy t\u1eafc ph\u00e2n ph\u1ed1i d\u1eef li\u1ec7u v\u00e0 th\u00f4ng tin c\u1ea5u h\u00ecnh c\u1ea7n thi\u1ebft \u0111\u1ec3 duy tr\u00ec v\u00e0 qu\u1ea3n l\u00fd c\u1ee5m sharded cluster.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Replication (Nh\u00e2n b\u1ea3n)<\/b><span style=\"font-weight: 400;\">: \u0110\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00ednh s\u1eb5n s\u00e0ng v\u00e0 d\u1ef1 ph\u00f2ng, m\u1ed7i shard th\u01b0\u1eddng c\u00f3 c\u00e1c b\u1ea3n sao d\u1eef li\u1ec7u (replica) tr\u00ean nhi\u1ec1u m\u00e1y ch\u1ee7 kh\u00e1c nhau.<\/span><\/li>\n<\/ul>\n<p><b>L\u01b0u \u00fd<\/b><span style=\"font-weight: 400;\">: <\/span><b>Replication<\/b><span style=\"font-weight: 400;\"> l\u00e0 m\u1ed9t th\u00e0nh ph\u1ea7n <\/span><b>kh\u00f4ng b\u1eaft bu\u1ed9c<\/b><span style=\"font-weight: 400;\"> trong h\u1ec7 th\u1ed1ng sharding. M\u1ed9t s\u1ed1 h\u1ec7 th\u1ed1ng NoSQL c\u00f3 s\u1eed d\u1ee5ng replication \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o kh\u1ea3 n\u0103ng ch\u1ecbu l\u1ed7i (v\u00ed d\u1ee5: MongoDB), trong khi m\u1ed9t s\u1ed1 h\u1ec7 th\u1ed1ng kh\u00e1c c\u00f3 th\u1ec3 kh\u00f4ng tri\u1ec3n khai replication \u0111\u1ec3 t\u1ed1i \u01b0u hi\u1ec7u su\u1ea5t ho\u1eb7c chi ph\u00ed.<\/span><\/p>\n<h3><b>T\u1ea1i sao sharding quan tr\u1ecdng trong NoSQL?<\/b><\/h3>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>T\u0103ng kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng (Scalability)<\/b><span style=\"font-weight: 400;\">: Sharding cho ph\u00e9p c\u00e1c c\u01a1 s\u1edf d\u1eef li\u1ec7u NoSQL m\u1edf r\u1ed9ng ngang b\u1eb1ng c\u00e1ch th\u00eam nhi\u1ec1u m\u00e1y ch\u1ee7. Khi l\u01b0\u1ee3ng d\u1eef li\u1ec7u ho\u1eb7c t\u1ea3i c\u00f4ng vi\u1ec7c t\u0103ng l\u00ean, b\u1ea1n ch\u1ec9 c\u1ea7n th\u00eam m\u00e1y ch\u1ee7 m\u1edbi \u0111\u1ec3 l\u01b0u tr\u1eef c\u00e1c shard b\u1ed5 sung, thay v\u00ec n\u00e2ng c\u1ea5p ph\u1ea7n c\u1ee9ng cho m\u1ed9t m\u00e1y ch\u1ee7 duy nh\u1ea5t.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>T\u0103ng hi\u1ec7u su\u1ea5t: <\/b><span style=\"font-weight: 400;\">B\u1eb1ng c\u00e1ch ph\u00e2n ph\u1ed1i d\u1eef li\u1ec7u tr\u00ean nhi\u1ec1u m\u00e1y ch\u1ee7, sharding gi\u1ea3m t\u1ea3i tr\u00ean m\u1ed7i m\u00e1y ch\u1ee7, gi\u00fap t\u0103ng t\u1ed1c \u0111\u1ed9 x\u1eed l\u00fd c\u00e1c truy v\u1ea5n v\u00e0 giao d\u1ecbch, \u0111\u1eb7c bi\u1ec7t l\u00e0 trong c\u00e1c h\u1ec7 th\u1ed1ng l\u1edbn.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>\u0110\u1ea3m b\u1ea3o t\u00ednh s\u1eb5n s\u00e0ng (Availability): <\/b><span style=\"font-weight: 400;\">N\u1ebfu m\u1ed9t shard b\u1ecb l\u1ed7i, c\u00e1c shard kh\u00e1c v\u1eabn ti\u1ebfp t\u1ee5c ho\u1ea1t \u0111\u1ed9ng, gi\u00fap h\u1ec7 th\u1ed1ng duy tr\u00ec t\u00ednh s\u1eb5n s\u00e0ng v\u00e0 gi\u1ea3m thi\u1ec3u th\u1eddi gian ch\u1ebft.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Gi\u00fap qu\u1ea3n l\u00fd d\u1eef li\u1ec7u l\u1edbn hi\u1ec7u qu\u1ea3: <\/b><span style=\"font-weight: 400;\">C\u00e1c c\u01a1 s\u1edf d\u1eef li\u1ec7u NoSQL th\u01b0\u1eddng \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 x\u1eed l\u00fd l\u01b0\u1ee3ng d\u1eef li\u1ec7u l\u1edbn v\u00e0 phi c\u1ea5u tr\u00fac. Sharding gi\u00fap chia nh\u1ecf d\u1eef li\u1ec7u \u0111\u1ec3 l\u01b0u tr\u1eef v\u00e0 qu\u1ea3n l\u00fd hi\u1ec7u qu\u1ea3 h\u01a1n, \u0111\u1eb7c bi\u1ec7t khi k\u00edch th\u01b0\u1edbc d\u1eef li\u1ec7u v\u01b0\u1ee3t qu\u00e1 kh\u1ea3 n\u0103ng c\u1ee7a m\u1ed9t m\u00e1y ch\u1ee7.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Gi\u00fap t\u1ed1i \u01b0u h\u00f3a chi ph\u00ed: <\/b><span style=\"font-weight: 400;\">Thay v\u00ec \u0111\u1ea7u t\u01b0 v\u00e0o m\u1ed9t m\u00e1y ch\u1ee7 l\u1edbn v\u00e0 \u0111\u1eaft ti\u1ec1n, sharding cho ph\u00e9p s\u1eed d\u1ee5ng nhi\u1ec1u m\u00e1y ch\u1ee7 nh\u1ecf h\u01a1n, gi\u00fap gi\u1ea3m chi ph\u00ed t\u1ed5ng th\u1ec3.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">V\u00ed d\u1ee5, trong m\u1ed9t c\u01a1 s\u1edf d\u1eef li\u1ec7u NoSQL nh\u01b0 MongoDB, sharding c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n d\u1ef1a tr\u00ean m\u1ed9t &#8220;shard key&#8221; (kh\u00f3a ph\u00e2n m\u1ea3nh) nh\u01b0 ID ng\u01b0\u1eddi d\u00f9ng ho\u1eb7c m\u00e3 s\u1ea3n ph\u1ea9m. Vi\u1ec7c ch\u1ecdn kh\u00f3a sharding ph\u00f9 h\u1ee3p r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c ph\u00e2n ph\u1ed1i \u0111\u1ed3ng \u0111\u1ec1u gi\u1eefa c\u00e1c shard v\u00e0 tr\u00e1nh t\u00ecnh tr\u1ea1ng &#8220;n\u00fat c\u1ed5 chai&#8221; (bottleneck).<\/span><\/p>\n<h3><b>Th\u00e1ch th\u1ee9c c\u1ee7a Sharding trong NoSQL l\u00e0 g\u00ec?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">M\u1eb7c d\u00f9 sharding l\u00e0 m\u1ed9t gi\u1ea3i ph\u00e1p hi\u1ec7u qu\u1ea3 \u0111\u1ec3 x\u1eed l\u00fd d\u1eef li\u1ec7u l\u1edbn trong c\u00e1c h\u1ec7 th\u1ed1ng NoSQL, nh\u01b0ng n\u00f3 c\u0169ng \u0111i k\u00e8m v\u1edbi nhi\u1ec1u th\u00e1ch th\u1ee9c ph\u1ee9c t\u1ea1p trong qu\u00e1 tr\u00ecnh tri\u1ec3n khai v\u00e0 qu\u1ea3n l\u00fd:<\/span><\/p>\n<ul>\n<li><b>L\u1ef1a ch\u1ecdn Shard Key ph\u00f9 h\u1ee3p<\/b><span style=\"font-weight: 400;\">: Shard key \u0111\u00f3ng vai tr\u00f2 quy\u1ebft \u0111\u1ecbnh trong vi\u1ec7c ph\u00e2n ph\u1ed1i d\u1eef li\u1ec7u gi\u1eefa c\u00e1c shard. M\u1ed9t shard key kh\u00f4ng ph\u00f9 h\u1ee3p c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn ph\u00e2n m\u1ea3nh d\u1eef li\u1ec7u kh\u00f4ng \u0111\u1ed3ng \u0111\u1ec1u (unbalanced shards), g\u00e2y qu\u00e1 t\u1ea3i tr\u00ean m\u1ed9t s\u1ed1 shard (hotspot) trong khi c\u00e1c shard kh\u00e1c \u00edt \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng d\u1eabn \u0111\u1ebfn gi\u1ea3m hi\u1ec7u n\u0103ng h\u1ec7 th\u1ed1ng.<\/span><\/li>\n<li><b>Qu\u1ea3n l\u00fd c\u00e2n b\u1eb1ng d\u1eef li\u1ec7u (Data Balancing)<\/b><span style=\"font-weight: 400;\">: Khi th\u00eam ho\u1eb7c x\u00f3a shard, h\u1ec7 th\u1ed1ng c\u1ea7n di chuy\u1ec3n d\u1eef li\u1ec7u gi\u1eefa c\u00e1c shard \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o s\u1ef1 c\u00e2n b\u1eb1ng t\u1ea3i. Qu\u00e1 tr\u00ecnh n\u00e0y ph\u1ee9c t\u1ea1p, ti\u00eau t\u1ed1n t\u00e0i nguy\u00ean v\u00e0 c\u00f3 th\u1ec3 l\u00e0m gi\u1ea3m hi\u1ec7u su\u1ea5t h\u1ec7 th\u1ed1ng trong th\u1eddi gian di chuy\u1ec3n.<\/span><\/li>\n<li><b>Ph\u1ee9c t\u1ea1p trong x\u1eed l\u00fd truy v\u1ea5n (Query Complexity)<\/b><span style=\"font-weight: 400;\">: C\u00e1c truy v\u1ea5n li\u00ean quan \u0111\u1ebfn nhi\u1ec1u shard (query scatter) c\u1ea7n \u0111\u01b0\u1ee3c ph\u00e2n t\u00e1n v\u00e0 h\u1ee3p nh\u1ea5t k\u1ebft qu\u1ea3 t\u1eeb c\u00e1c shard, d\u1eabn \u0111\u1ebfn vi\u1ec7c l\u00e0m t\u0103ng \u0111\u1ed9 tr\u1ec5 v\u00e0 gi\u1ea3m hi\u1ec7u su\u1ea5t.<\/span><\/li>\n<li><b>Kh\u00f3 kh\u0103n trong vi\u1ec7c m\u1edf r\u1ed9ng v\u00e0 gi\u1ea3m quy m\u00f4 (Scaling)<\/b><span style=\"font-weight: 400;\">: M\u1eb7c d\u00f9 sharding h\u1ed7 tr\u1ee3 m\u1edf r\u1ed9ng ngang, vi\u1ec7c th\u00eam ho\u1eb7c x\u00f3a shard c\u00f3 th\u1ec3 y\u00eau c\u1ea7u c\u1ea5u h\u00ecnh l\u1ea1i h\u1ec7 th\u1ed1ng v\u00e0 \u0111i\u1ec1u ch\u1ec9nh d\u1eef li\u1ec7u. \u0110i\u1ec1u n\u00e0y kh\u00f4ng ph\u1ea3i l\u00fac n\u00e0o c\u0169ng d\u1ec5 d\u00e0ng, \u0111\u1eb7c bi\u1ec7t v\u1edbi kh\u1ed1i l\u01b0\u1ee3ng d\u1eef li\u1ec7u l\u1edbn.<\/span><\/li>\n<li><b>T\u00ednh nh\u1ea5t qu\u00e1n d\u1eef li\u1ec7u (Data Consistency): <\/b><span style=\"font-weight: 400;\">Trong m\u00f4i tr\u01b0\u1eddng ph\u00e2n t\u00e1n, vi\u1ec7c \u0111\u1ea3m b\u1ea3o d\u1eef li\u1ec7u nh\u1ea5t qu\u00e1n tr\u00ean c\u00e1c shard, \u0111\u1eb7c bi\u1ec7t khi c\u00f3 c\u00e1c b\u1ea3n sao d\u1eef li\u1ec7u (replica), tr\u1edf n\u00ean ph\u1ee9c t\u1ea1p. \u0110\u00e2y l\u00e0 m\u1ed9t th\u00e1ch th\u1ee9c l\u1edbn \u0111\u1ed1i v\u1edbi c\u00e1c h\u1ec7 th\u1ed1ng y\u00eau c\u1ea7u t\u00ednh nh\u1ea5t qu\u00e1n cao.<\/span><\/li>\n<li><b>Chi ph\u00ed b\u1ea3o tr\u00ec: <\/b><span style=\"font-weight: 400;\">Sharding l\u00e0m t\u0103ng \u0111\u1ed9 ph\u1ee9c t\u1ea1p c\u1ee7a h\u1ec7 th\u1ed1ng, y\u00eau c\u1ea7u \u0111\u1ed9i ng\u0169 k\u1ef9 thu\u1eadt c\u00f3 ki\u1ebfn th\u1ee9c chuy\u00ean m\u00f4n cao \u0111\u1ec3 thi\u1ebft k\u1ebf, v\u1eadn h\u00e0nh v\u00e0 gi\u00e1m s\u00e1t h\u1ec7 th\u1ed1ng.<\/span><\/li>\n<\/ul>\n<h3><b>M\u00f4 t\u1ea3 c\u00e1c lo\u1ea1i Sharding<\/b><\/h3>\n<h4><b>1. Range-based Sharding (Sharding theo kho\u1ea3ng)<\/b><\/h4>\n<p><b>C\u00e1ch ho\u1ea1t \u0111\u1ed9ng<\/b><span style=\"font-weight: 400;\">: D\u1eef li\u1ec7u \u0111\u01b0\u1ee3c ph\u00e2n chia th\u00e0nh c\u00e1c kho\u1ea3ng gi\u00e1 tr\u1ecb (range) d\u1ef1a tr\u00ean m\u1ed9t shard key c\u1ee5 th\u1ec3. M\u1ed7i kho\u1ea3ng s\u1ebd t\u01b0\u01a1ng \u1ee9ng v\u1edbi m\u1ed9t shard ri\u00eang bi\u1ec7t.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">V\u00ed d\u1ee5: V\u1edbi m\u1ed9t h\u1ec7 th\u1ed1ng s\u1eed d\u1ee5ng <\/span><span style=\"font-weight: 400;\">user_id<\/span><span style=\"font-weight: 400;\"> l\u00e0m shard key:<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><b>Kho\u1ea3ng (Range)<\/b><\/td>\n<td><b>Shard ID<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">[0, 1000)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Shard A<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">[1000, 2000)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Shard B<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">[2000, 3000)<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Shard C<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"font-weight: 400;\">N\u1ebfu truy v\u1ea5n t\u00ecm d\u1eef li\u1ec7u v\u1edbi <\/span><span style=\"font-weight: 400;\">user_id<\/span><span style=\"font-weight: 400;\"> trong kho\u1ea3ng t\u1eeb 500 \u0111\u1ebfn 1500, ch\u1ec9 Shard A v\u00e0 Shard B c\u1ea7n \u0111\u01b0\u1ee3c truy v\u1ea5n.<\/span><\/p>\n<p><b>\u01afu \u0111i\u1ec3m<\/b><span style=\"font-weight: 400;\">:<\/span><\/p>\n<ul>\n<li><span style=\"font-weight: 400;\">D\u1ec5 tri\u1ec3n khai v\u00e0 ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c h\u1ec7 th\u1ed1ng c\u00f3 c\u1ea5u tr\u00fac d\u1eef li\u1ec7u tu\u1ea7n t\u1ef1.<\/span><\/li>\n<li><span style=\"font-weight: 400;\">Truy v\u1ea5n theo kho\u1ea3ng (range queries) r\u1ea5t hi\u1ec7u qu\u1ea3 v\u00ec ch\u1ec9 c\u1ea7n truy c\u1eadp m\u1ed9t s\u1ed1 shard c\u1ee5 th\u1ec3.<\/span><\/li>\n<\/ul>\n<p><b>Nh\u01b0\u1ee3c \u0111i\u1ec3m<\/b><span style=\"font-weight: 400;\">:<\/span><\/p>\n<ul>\n<li><span style=\"font-weight: 400;\">L\u1ef1a ch\u1ecdn shard key kh\u00f4ng ph\u00f9 h\u1ee3p c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn t\u00ecnh tr\u1ea1ng m\u1ea5t c\u00e2n b\u1eb1ng t\u1ea3i (hotspot).<\/span><\/li>\n<li><span style=\"font-weight: 400;\">Lookup table c\u00f3 th\u1ec3 tr\u1edf th\u00e0nh \u0111i\u1ec3m t\u1eafc ngh\u1ebdn khi h\u1ec7 th\u1ed1ng m\u1edf r\u1ed9ng l\u1edbn.<\/span><\/li>\n<\/ul>\n<h4><b>2. Hash-based Sharding (Sharding d\u1ef1a tr\u00ean h\u00e0m b\u0103m)<\/b><\/h4>\n<p><b>C\u00e1ch ho\u1ea1t \u0111\u1ed9ng<\/b><span style=\"font-weight: 400;\">: S\u1eed d\u1ee5ng m\u1ed9t h\u00e0m b\u0103m (hash function) \u0111\u1ec3 t\u00ednh to\u00e1n shard d\u1ef1a tr\u00ean gi\u00e1 tr\u1ecb shard key. Gi\u00e1 tr\u1ecb b\u0103m \u0111\u01b0\u1ee3c \u00e1nh x\u1ea1 t\u1edbi shard t\u01b0\u01a1ng \u1ee9ng.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">V\u00ed d\u1ee5: S\u1eed d\u1ee5ng <\/span><span style=\"font-weight: 400;\">user_id<\/span><span style=\"font-weight: 400;\"> l\u00e0m shard key v\u1edbi h\u00e0m b\u0103m \u0111\u01a1n gi\u1ea3n:<\/span><\/p>\n<pre><span style=\"font-weight: 400;\">shard = hash(user_id) % s\u1ed1 l\u01b0\u1ee3ng shard<\/span><\/pre>\n<p><span style=\"font-weight: 400;\">N\u1ebfu <\/span><span style=\"font-weight: 400;\">hash(1001) % 3 = 1<\/span><span style=\"font-weight: 400;\">, d\u1eef li\u1ec7u s\u1ebd \u0111\u01b0\u1ee3c l\u01b0u v\u00e0o <\/span><b>Shard 1<\/b><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p><b>\u01afu \u0111i\u1ec3m<\/b><span style=\"font-weight: 400;\">:<\/span><\/p>\n<ul>\n<li><span style=\"font-weight: 400;\">Ph\u00e2n ph\u1ed1i \u0111\u1ed3ng \u0111\u1ec1u d\u1eef li\u1ec7u tr\u00ean c\u00e1c shard, gi\u1ea3m t\u00ecnh tr\u1ea1ng m\u1ea5t c\u00e2n b\u1eb1ng t\u1ea3i.<\/span><\/li>\n<li><span style=\"font-weight: 400;\">Kh\u00f4ng c\u1ea7n b\u1ea3ng tra c\u1ee9u nh\u01b0 range-based sharding.<\/span><\/li>\n<\/ul>\n<p><b>Nh\u01b0\u1ee3c \u0111i\u1ec3m<\/b><span style=\"font-weight: 400;\">:<\/span><\/p>\n<ul>\n<li><span style=\"font-weight: 400;\">Truy v\u1ea5n theo kho\u1ea3ng s\u1ebd kh\u00f4ng hi\u1ec7u qu\u1ea3 v\u00ec d\u1eef li\u1ec7u \u0111\u00e3 \u0111\u01b0\u1ee3c ph\u00e2n t\u00e1n ng\u1eabu nhi\u00ean.<\/span><\/li>\n<li><span style=\"font-weight: 400;\">Resharding (t\u00e1i ph\u00e2n chia shard) r\u1ea5t t\u1ed1n k\u00e9m v\u00ec c\u1ea7n di chuy\u1ec3n nhi\u1ec1u d\u1eef li\u1ec7u khi th\u00eam ho\u1eb7c b\u1edbt shard.<\/span><\/li>\n<\/ul>\n<h4><b>3. Entity-based Sharding (Sharding theo th\u1ef1c th\u1ec3)<\/b><\/h4>\n<p><b>C\u00e1ch ho\u1ea1t \u0111\u1ed9ng: <\/b><span style=\"font-weight: 400;\">D\u1eef li\u1ec7u li\u00ean quan \u0111\u1ebfn m\u1ed9t th\u1ef1c th\u1ec3 ch\u00ednh \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef tr\u00ean c\u00f9ng m\u1ed9t shard \u0111\u1ec3 gi\u1ea3m truy v\u1ea5n ch\u00e9o shard.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">V\u00ed d\u1ee5: Trong m\u1ed9t h\u1ec7 th\u1ed1ng th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed, d\u1eef li\u1ec7u c\u1ee7a ng\u01b0\u1eddi d\u00f9ng v\u00e0 \u0111\u01a1n h\u00e0ng li\u00ean quan s\u1ebd \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef c\u00f9ng m\u1ed9t shard:<\/span><\/p>\n<pre><span style=\"font-weight: 400;\">{<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0\"user_id\": \"123\",<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0\"name\": \"John Doe\",<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0\"orders\": [<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0{ \"order_id\": \"101\", \"amount\": 50 },<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0{ \"order_id\": \"102\", \"amount\": 100 }<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0]<\/span>\r\n\r\n<span style=\"font-weight: 400;\">}<\/span><\/pre>\n<p><b>\u01afu \u0111i\u1ec3m<\/b><span style=\"font-weight: 400;\">:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">T\u0103ng t\u1ed1c \u0111\u1ed9 truy v\u1ea5n d\u1eef li\u1ec7u c\u00f3 m\u1ed1i quan h\u1ec7 ch\u1eb7t ch\u1ebd.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Gi\u1ea3m thi\u1ec3u s\u1ed1 l\u01b0\u1ee3ng truy v\u1ea5n ch\u00e9o shard (cross-shard queries).<\/span><\/li>\n<\/ul>\n<p><b>Nh\u01b0\u1ee3c \u0111i\u1ec3m<\/b><span style=\"font-weight: 400;\">:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">D\u1ec5 g\u1eb7p t\u00ecnh tr\u1ea1ng hotspot n\u1ebfu m\u1ed9t th\u1ef1c th\u1ec3 c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng d\u1eef li\u1ec7u l\u1edbn.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Kh\u00f4ng ph\u00f9 h\u1ee3p cho c\u00e1c h\u1ec7 th\u1ed1ng c\u00f3 d\u1eef li\u1ec7u \u0111\u1ed9c l\u1eadp gi\u1eefa c\u00e1c th\u1ef1c th\u1ec3.<\/span><\/li>\n<\/ul>\n<h4><b>4. Geography-based Sharding (Sharding theo \u0111\u1ecba l\u00fd)<\/b><\/h4>\n<p><b>C\u00e1ch ho\u1ea1t \u0111\u1ed9ng: <\/b><span style=\"font-weight: 400;\">D\u1eef li\u1ec7u \u0111\u01b0\u1ee3c ph\u00e2n chia d\u1ef1a tr\u00ean v\u1ecb tr\u00ed \u0111\u1ecba l\u00fd c\u1ee7a ng\u01b0\u1eddi d\u00f9ng ho\u1eb7c d\u1eef li\u1ec7u. C\u00e1c shard th\u01b0\u1eddng \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef tr\u00ean c\u00e1c m\u00e1y ch\u1ee7 theo khu v\u1ef1c \u0111\u1ec3 gi\u1ea3m \u0111\u1ed9 tr\u1ec5.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">V\u00ed d\u1ee5: M\u1ed9t h\u1ec7 th\u1ed1ng to\u00e0n c\u1ea7u c\u00f3 th\u1ec3 ph\u00e2n chia d\u1eef li\u1ec7u nh\u01b0 sau:<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><b>Khu v\u1ef1c<\/b><\/td>\n<td><b>Shard<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">B\u1eafc M\u1ef9<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Shard US<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Ch\u00e2u \u00c2u<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Shard EU<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Ch\u00e2u \u00c1<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Shard ASIA<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"font-weight: 400;\">D\u1eef li\u1ec7u ng\u01b0\u1eddi d\u00f9ng \u1edf khu v\u1ef1c B\u1eafc M\u1ef9 s\u1ebd \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef tr\u00ean Shard US.<\/span><\/p>\n<p><b>\u01afu \u0111i\u1ec3m<\/b><span style=\"font-weight: 400;\">:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Gi\u1ea3m \u0111\u1ed9 tr\u1ec5 truy v\u1ea5n b\u1eb1ng c\u00e1ch l\u01b0u tr\u1eef d\u1eef li\u1ec7u g\u1ea7n v\u1edbi ng\u01b0\u1eddi d\u00f9ng.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">H\u1ed7 tr\u1ee3 t\u1ed1i \u01b0u h\u00f3a c\u00e1c h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n tr\u00ean to\u00e0n c\u1ea7u.<\/span><\/li>\n<\/ul>\n<p><b>Nh\u01b0\u1ee3c \u0111i\u1ec3m<\/b><span style=\"font-weight: 400;\">:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">C\u00f3 th\u1ec3 c\u1ea7n resharding khi d\u1eef li\u1ec7u t\u0103ng kh\u00f4ng \u0111\u1ed3ng \u0111\u1ec1u gi\u1eefa c\u00e1c khu v\u1ef1c.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Kh\u00f3 x\u1eed l\u00fd khi ng\u01b0\u1eddi d\u00f9ng c\u00f3 d\u1eef li\u1ec7u li\u00ean quan \u1edf nhi\u1ec1u khu v\u1ef1c kh\u00e1c nhau.<\/span><\/li>\n<\/ul>\n<h3><b>Ph\u00e2n bi\u1ec7t gi\u1eefa scaling horizontal v\u00e0 scaling vertical.<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Khi c\u1ea7n m\u1edf r\u1ed9ng h\u1ec7 th\u1ed1ng \u0111\u1ec3 x\u1eed l\u00fd nhi\u1ec1u d\u1eef li\u1ec7u h\u01a1n ho\u1eb7c t\u0103ng c\u01b0\u1eddng hi\u1ec7u su\u1ea5t, c\u00f3 hai ph\u01b0\u01a1ng ph\u00e1p ch\u00ednh \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng: Scaling Horizontal (m\u1edf r\u1ed9ng ngang) v\u00e0 Scaling Vertical (m\u1edf r\u1ed9ng d\u1ecdc). D\u01b0\u1edbi \u0111\u00e2y l\u00e0 s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa hai ph\u01b0\u01a1ng ph\u00e1p n\u00e0y:<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><b>Ti\u00eau ch\u00ed<\/b><\/td>\n<td><b>Scaling Horizontal<\/b><\/td>\n<td><b>Scaling Vertical<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">C\u00e1ch th\u1ef1c hi\u1ec7n\u00a0<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Th\u00eam nhi\u1ec1u m\u00e1y ch\u1ee7 ho\u1eb7c n\u00fat (nodes) m\u1edbi v\u00e0o h\u1ec7 th\u1ed1ng, ph\u00e2n ph\u1ed1i d\u1eef li\u1ec7u v\u00e0 t\u1ea3i c\u00f4ng vi\u1ec7c gi\u1eefa c\u00e1c m\u00e1y ch\u1ee7 \u0111\u00f3. D\u1eef li\u1ec7u th\u01b0\u1eddng \u0111\u01b0\u1ee3c ph\u00e2n chia th\u00f4ng qua c\u00e1c k\u1ef9 thu\u1eadt nh\u01b0 sharding ho\u1eb7c replication.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">N\u00e2ng c\u1ea5p ph\u1ea7n c\u1ee9ng c\u1ee7a m\u00e1y ch\u1ee7 hi\u1ec7n t\u1ea1i (CPU, RAM, \u1ed5 c\u1ee9ng, SSD).<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Kh\u00f4ng gi\u1edbi h\u1ea1n \u2013 c\u00f3 th\u1ec3 th\u00eam bao nhi\u00eau m\u00e1y ch\u1ee7 t\u00f9y theo nhu c\u1ea7u.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Gi\u1edbi h\u1ea1n b\u1edfi kh\u1ea3 n\u0103ng n\u00e2ng c\u1ea5p ph\u1ea7n c\u1ee9ng c\u1ee7a m\u00e1y ch\u1ee7.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Kh\u1ea3 n\u0103ng ch\u1ecbu l\u1ed7i<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Cao \u2013 n\u1ebfu m\u1ed9t m\u00e1y ch\u1ee7 ho\u1eb7c n\u00fat g\u1eb7p l\u1ed7i, c\u00e1c m\u00e1y kh\u00e1c v\u1eabn ho\u1ea1t \u0111\u1ed9ng.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Th\u1ea5p \u2013 n\u1ebfu m\u00e1y ch\u1ee7 b\u1ecb l\u1ed7i, to\u00e0n b\u1ed9 h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 ng\u1eebng ho\u1ea1t \u0111\u1ed9ng.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Chi ph\u00ed<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Th\u1ea5p h\u01a1n \u2013 s\u1eed d\u1ee5ng nhi\u1ec1u m\u00e1y ch\u1ee7 th\u00f4ng th\u01b0\u1eddng (commodity hardware).<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Cao h\u01a1n \u2013 c\u1ea7n ph\u1ea7n c\u1ee9ng m\u1ea1nh v\u00e0 chuy\u00ean d\u1ee5ng.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">\u0110\u1ed9 ph\u1ee9c t\u1ea1p tri\u1ec3n khai<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Cao h\u01a1n \u2013 c\u1ea7n thi\u1ebft k\u1ebf l\u1ea1i h\u1ec7 th\u1ed1ng \u0111\u1ec3 h\u1ed7 tr\u1ee3 \u0111\u1ed3ng b\u1ed9 h\u00f3a v\u00e0 ph\u00e2n ph\u1ed1i t\u1ea3i.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Th\u1ea5p h\u01a1n \u2013 kh\u00f4ng c\u1ea7n thay \u0111\u1ed5i c\u1ea5u tr\u00fac h\u1ec7 th\u1ed1ng.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Hi\u1ec7u su\u1ea5t<\/span><\/td>\n<td><span style=\"font-weight: 400;\">C\u1ea3i thi\u1ec7n b\u1eb1ng c\u00e1ch ph\u00e2n t\u1ea3i c\u00f4ng vi\u1ec7c gi\u1eefa c\u00e1c m\u00e1y ch\u1ee7.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">C\u1ea3i thi\u1ec7n b\u1eb1ng c\u00e1ch t\u0103ng kh\u1ea3 n\u0103ng x\u1eed l\u00fd c\u1ee7a m\u1ed9t m\u00e1y ch\u1ee7 duy nh\u1ea5t.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Kh\u1ea3 n\u0103ng tri\u1ec3n khai<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Ch\u1eadm h\u01a1n \u2013 c\u1ea7n thi\u1ebft k\u1ebf c\u01a1 ch\u1ebf c\u00e2n b\u1eb1ng t\u1ea3i v\u00e0 \u0111\u1ed3ng b\u1ed9 h\u00f3a d\u1eef li\u1ec7u.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Nhanh h\u01a1n \u2013 ch\u1ec9 c\u1ea7n n\u00e2ng c\u1ea5p ph\u1ea7n c\u1ee9ng.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">\u1ee8ng d\u1ee5ng<\/span><\/td>\n<td><span style=\"font-weight: 400;\">H\u1ec7 th\u1ed1ng l\u1edbn, ph\u00e2n t\u00e1n: NoSQL, Big Data, m\u1ea1ng x\u00e3 h\u1ed9i, IoT.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">H\u1ec7 th\u1ed1ng nh\u1ecf ho\u1eb7c c\u1ea7n c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t trong ng\u1eafn h\u1ea1n.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><b>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 qu\u1ea3n l\u00fd xung \u0111\u1ed9t d\u1eef li\u1ec7u trong eventual consistency?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Trong h\u1ec7 th\u1ed1ng eventual consistency, xung \u0111\u1ed9t d\u1eef li\u1ec7u c\u00f3 th\u1ec3 x\u1ea3y ra khi c\u00f9ng m\u1ed9t b\u1ea3n ghi \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt tr\u00ean nhi\u1ec1u n\u00fat (nodes) tr\u01b0\u1edbc khi c\u00e1c thay \u0111\u1ed5i \u0111\u01b0\u1ee3c \u0111\u1ed3ng b\u1ed9 h\u00f3a. Qu\u1ea3n l\u00fd xung \u0111\u1ed9t d\u1eef li\u1ec7u l\u00e0 m\u1ed9t th\u00e1ch th\u1ee9c quan tr\u1ecdng trong c\u00e1c h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 ph\u01b0\u01a1ng ph\u00e1p ph\u1ed5 bi\u1ebfn \u0111\u1ec3 gi\u1ea3i quy\u1ebft xung \u0111\u1ed9t d\u1eef li\u1ec7u:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Last Write Wins (LWW)<\/b><span style=\"font-weight: 400;\">: D\u1eef li\u1ec7u \u0111\u01b0\u1ee3c g\u1eafn d\u1ea5u th\u1eddi gian (timestamp) v\u00e0 b\u1ea3n ghi v\u1edbi timestamp m\u1edbi nh\u1ea5t \u0111\u01b0\u1ee3c gi\u1eef l\u1ea1i. Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y \u0111\u01a1n gi\u1ea3n v\u00e0 nhanh nh\u01b0ng c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn m\u1ea5t d\u1eef li\u1ec7u n\u1ebfu c\u00e1c thay \u0111\u1ed5i tr\u01b0\u1edbc \u0111\u00f3 b\u1ecb ghi \u0111\u00e8 ho\u1eb7c c\u00e1c n\u00fat c\u00f3 \u0111\u1ed3ng h\u1ed3 h\u1ec7 th\u1ed1ng kh\u00f4ng \u0111\u1ed3ng b\u1ed9.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>H\u1ee3p nh\u1ea5t d\u1eef li\u1ec7u (Data Merging)<\/b><span style=\"font-weight: 400;\">: C\u00e1c thay \u0111\u1ed5i t\u1eeb nhi\u1ec1u n\u00fat \u0111\u01b0\u1ee3c k\u1ebft h\u1ee3p l\u1ea1i thay v\u00ec ghi \u0111\u00e8, \u0111\u1eb7c bi\u1ec7t hi\u1ec7u qu\u1ea3 n\u1ebfu c\u00e1c thay \u0111\u1ed5i kh\u00f4ng xung \u0111\u1ed9t tr\u1ef1c ti\u1ebfp (v\u00ed d\u1ee5: ch\u1ec9nh s\u1eeda c\u00e1c tr\u01b0\u1eddng kh\u00e1c nhau). Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y y\u00eau c\u1ea7u logic h\u1ee3p nh\u1ea5t r\u00f5 r\u00e0ng.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Vector Clock<\/b><span style=\"font-weight: 400;\">: Theo d\u00f5i l\u1ecbch s\u1eed thay \u0111\u1ed5i c\u1ee7a b\u1ea3n ghi th\u00f4ng qua m\u1ed9t \u0111\u1ed3ng h\u1ed3 vector, cho ph\u00e9p h\u1ec7 th\u1ed1ng ph\u00e1t hi\u1ec7n v\u00e0 x\u1eed l\u00fd xung \u0111\u1ed9t ph\u1ee9c t\u1ea1p m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c. Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c h\u1ec7 th\u1ed1ng nh\u01b0 DynamoDB.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Replication v\u1edbi Primary Node<\/b><span style=\"font-weight: 400;\">: \u01afu ti\u00ean b\u1ea3n ghi t\u1eeb n\u00fat ch\u00ednh (primary node) trong tr\u01b0\u1eddng h\u1ee3p x\u1ea3y ra xung \u0111\u1ed9t, gi\u00fap \u0111\u01a1n gi\u1ea3n h\u00f3a qu\u00e1 tr\u00ecnh x\u1eed l\u00fd nh\u01b0ng ph\u1ee5 thu\u1ed9c v\u00e0o n\u00fat ch\u00ednh v\u00e0 c\u00f3 th\u1ec3 gi\u1ea3m t\u00ednh ph\u00e2n t\u00e1n.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Conflict-Free Replicated Data Types (CRDTs)<\/b><span style=\"font-weight: 400;\">: S\u1eed d\u1ee5ng c\u00e1c c\u1ea5u tr\u00fac d\u1eef li\u1ec7u \u0111\u1eb7c bi\u1ec7t \u0111\u1ec3 t\u1ef1 \u0111\u1ed9ng gi\u1ea3i quy\u1ebft xung \u0111\u1ed9t m\u00e0 kh\u00f4ng c\u1ea7n can thi\u1ec7p t\u1eeb ng\u01b0\u1eddi d\u00f9ng. V\u00ed d\u1ee5: c\u00e1c ph\u00e9p to\u00e1n nh\u01b0 t\u0103ng b\u1ed9 \u0111\u1ebfm ho\u1eb7c th\u00eam ph\u1ea7n t\u1eed v\u00e0o danh s\u00e1ch c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c h\u1ee3p nh\u1ea5t t\u1ef1 \u0111\u1ed9ng.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Quorum-Based Resolution<\/b><span style=\"font-weight: 400;\">: Xung \u0111\u1ed9t \u0111\u01b0\u1ee3c gi\u1ea3i quy\u1ebft b\u1eb1ng \u0111\u1ed3ng thu\u1eadn t\u1eeb m\u1ed9t nh\u00f3m n\u00fat (quorum). V\u00ed d\u1ee5: m\u1ed9t thay \u0111\u1ed5i ch\u1ec9 \u0111\u01b0\u1ee3c ch\u1ea5p nh\u1eadn n\u1ebfu n\u00f3 nh\u1eadn \u0111\u01b0\u1ee3c x\u00e1c nh\u1eadn t\u1eeb \u0111a s\u1ed1 n\u00fat, qua \u0111\u00f3 gi\u00fap t\u0103ng \u0111\u1ed9 ch\u00ednh x\u00e1c nh\u01b0ng c\u00f3 th\u1ec3 l\u00e0m gi\u1ea3m t\u1ed1c \u0111\u1ed9 ghi ho\u1eb7c \u0111\u1ecdc d\u1eef li\u1ec7u.<\/span><\/li>\n<\/ul>\n<h3><b>L\u00e0m th\u1ebf n\u00e0o NoSQL gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 ph\u00e2n t\u00e1n d\u1eef li\u1ec7u?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">H\u1ec7 th\u1ed1ng NoSQL \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 ho\u1ea1t \u0111\u1ed9ng trong m\u00f4i tr\u01b0\u1eddng ph\u00e2n t\u00e1n, n\u01a1i d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef tr\u00ean nhi\u1ec1u m\u00e1y ch\u1ee7 ho\u1eb7c n\u00fat (nodes). \u0110\u1ec3 gi\u1ea3i quy\u1ebft c\u00e1c th\u00e1ch th\u1ee9c c\u1ee7a vi\u1ec7c ph\u00e2n t\u00e1n d\u1eef li\u1ec7u, NoSQL s\u1eed d\u1ee5ng m\u1ed9t s\u1ed1 chi\u1ebfn l\u01b0\u1ee3c ch\u00ednh:<\/span><\/p>\n<h4><b>Replication (Sao ch\u00e9p d\u1eef li\u1ec7u)<\/b><\/h4>\n<p><span style=\"font-weight: 400;\">D\u1eef li\u1ec7u \u0111\u01b0\u1ee3c sao ch\u00e9p tr\u00ean nhi\u1ec1u m\u00e1y ch\u1ee7 ho\u1eb7c nhi\u1ec1u n\u00fat \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00ednh s\u1eb5n s\u00e0ng v\u00e0 kh\u1ea3 n\u0103ng ch\u1ecbu l\u1ed7i. C\u00f3 hai lo\u1ea1i replication ph\u1ed5 bi\u1ebfn:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Master-Slave Replication<\/b><span style=\"font-weight: 400;\">: M\u1ed9t n\u00fat ch\u00ednh (master) th\u1ef1c hi\u1ec7n ghi d\u1eef li\u1ec7u, trong khi c\u00e1c n\u00fat ph\u1ee5 (slaves) sao ch\u00e9p v\u00e0 ph\u1ee5c v\u1ee5 c\u00e1c y\u00eau c\u1ea7u \u0111\u1ecdc.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Multi-Master Replication<\/b><span style=\"font-weight: 400;\">: T\u1ea5t c\u1ea3 c\u00e1c n\u00fat \u0111\u1ec1u c\u00f3 th\u1ec3 \u0111\u1ecdc v\u00e0 ghi, ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n l\u1edbn nh\u01b0ng y\u00eau c\u1ea7u x\u1eed l\u00fd xung \u0111\u1ed9t ph\u1ee9c t\u1ea1p h\u01a1n.<\/span><\/li>\n<\/ul>\n<h4><b>Sharding (Ph\u00e2n m\u1ea3nh d\u1eef li\u1ec7u)<\/b><\/h4>\n<p><span style=\"font-weight: 400;\">D\u1eef li\u1ec7u \u0111\u01b0\u1ee3c chia nh\u1ecf th\u00e0nh c\u00e1c ph\u1ea7n nh\u1ecf h\u01a1n (shards) v\u00e0 ph\u00e2n ph\u1ed1i tr\u00ean nhi\u1ec1u n\u00fat. Sharding gi\u00fap c\u00e2n b\u1eb1ng t\u1ea3i gi\u1eefa c\u00e1c m\u00e1y ch\u1ee7, t\u0103ng hi\u1ec7u su\u1ea5t v\u00e0 gi\u1ea3m \u00e1p l\u1ef1c l\u00ean t\u1eebng n\u00fat.<\/span><\/p>\n<h4><b>X\u1eed l\u00fd xung \u0111\u1ed9t d\u1eef li\u1ec7u<\/b><\/h4>\n<p><span style=\"font-weight: 400;\">Trong m\u00f4i tr\u01b0\u1eddng ph\u00e2n t\u00e1n, xung \u0111\u1ed9t c\u00f3 th\u1ec3 x\u1ea3y ra khi nhi\u1ec1u n\u00fat c\u1eadp nh\u1eadt c\u00f9ng m\u1ed9t d\u1eef li\u1ec7u. NoSQL s\u1eed d\u1ee5ng c\u00e1c c\u01a1 ch\u1ebf nh\u01b0 Last Write Wins, Vector Clocks, ho\u1eb7c h\u1ee3p nh\u1ea5t d\u1eef li\u1ec7u \u0111\u1ec3 gi\u1ea3i quy\u1ebft c\u00e1c xung \u0111\u1ed9t n\u00e0y.<\/span><\/p>\n<h4><b>Quorum-based Consistency<\/b><\/h4>\n<p><span style=\"font-weight: 400;\">Thay v\u00ec \u0111\u00f2i h\u1ecfi t\u1ea5t c\u1ea3 c\u00e1c m\u00e1y ch\u1ee7 ph\u1ea3i \u0111\u1ed3ng thu\u1eadn v\u1edbi nhau (nh\u01b0 trong SQL), NoSQL ch\u1ec9 y\u00eau c\u1ea7u m\u1ed9t s\u1ed1 l\u01b0\u1ee3ng t\u1ed1i thi\u1ec3u c\u00e1c m\u00e1y ch\u1ee7 (g\u1ecdi l\u00e0 quorum) \u0111\u1ed3ng thu\u1eadn tr\u01b0\u1edbc khi ch\u1ea5p nh\u1eadn m\u1ed9t thao t\u00e1c ghi (write) ho\u1eb7c \u0111\u1ecdc (read), gi\u00fap t\u0103ng hi\u1ec7u su\u1ea5t v\u00e0 t\u00ednh s\u1eb5n s\u00e0ng, nh\u01b0ng v\u1eabn duy tr\u00ec m\u1ee9c \u0111\u1ed9 nh\u1ea5t qu\u00e1n c\u1ea7n thi\u1ebft.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Trong \u0111\u00f3:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>W (Write Quorum)<\/b><span style=\"font-weight: 400;\">: S\u1ed1 l\u01b0\u1ee3ng m\u00e1y ch\u1ee7 ph\u1ea3i x\u00e1c nh\u1eadn m\u1ed9t thao t\u00e1c ghi (write) tr\u01b0\u1edbc khi n\u00f3 \u0111\u01b0\u1ee3c coi l\u00e0 th\u00e0nh c\u00f4ng.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>R (Read Quorum)<\/b><span style=\"font-weight: 400;\">: S\u1ed1 l\u01b0\u1ee3ng m\u00e1y ch\u1ee7 ph\u1ea3i x\u00e1c nh\u1eadn v\u00e0 tr\u1ea3 v\u1ec1 d\u1eef li\u1ec7u cho m\u1ed9t thao t\u00e1c \u0111\u1ecdc (read).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">\u0110\u1ec3 \u0111\u1ea3m b\u1ea3o d\u1eef li\u1ec7u nh\u1ea5t qu\u00e1n, t\u1ed5ng s\u1ed1 <\/span><b>W + R &gt; N<\/b><span style=\"font-weight: 400;\">, trong \u0111\u00f3 <\/span><b>N<\/b><span style=\"font-weight: 400;\"> l\u00e0 t\u1ed5ng s\u1ed1 m\u00e1y ch\u1ee7 l\u01b0u tr\u1eef d\u1eef li\u1ec7u.<\/span><\/li>\n<\/ul>\n<p><b>H\u1ec7 th\u1ed1ng \u0111i\u1ec1u h\u01b0\u1edbng truy v\u1ea5n (Query Routing)<\/b><span style=\"font-weight: 400;\">: l\u00e0 m\u1ed9t c\u01a1 ch\u1ebf trong c\u00e1c c\u01a1 s\u1edf d\u1eef li\u1ec7u ph\u00e2n t\u00e1n, \u0111\u1eb7c bi\u1ec7t ph\u1ed5 bi\u1ebfn trong NoSQL, \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 \u0111\u1ecbnh tuy\u1ebfn c\u00e1c truy v\u1ea5n c\u1ee7a ng\u01b0\u1eddi d\u00f9ng \u0111\u1ebfn \u0111\u00fang m\u00e1y ch\u1ee7 ho\u1eb7c n\u00fat (node) ch\u1ee9a d\u1eef li\u1ec7u c\u1ea7n thi\u1ebft.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Thay v\u00ec t\u00ecm ki\u1ebfm tr\u00ean to\u00e0n b\u1ed9 h\u1ec7 th\u1ed1ng, query routing t\u1ed1i \u01b0u h\u00f3a qu\u00e1 tr\u00ecnh x\u1eed l\u00fd b\u1eb1ng c\u00e1ch x\u00e1c \u0111\u1ecbnh v\u1ecb tr\u00ed d\u1eef li\u1ec7u d\u1ef1a tr\u00ean c\u00e1c kh\u00f3a \u0111\u1ecbnh tuy\u1ebfn (routing key) ho\u1eb7c shard key.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Cac_cau_hoi_phong_van_NoSQL_ve_hieu_suat_va_toi_uu_hoa\"><\/span><b>C\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NoSQL v\u1ec1 hi\u1ec7u su\u1ea5t v\u00e0 t\u1ed1i \u01b0u ho\u00e1<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><b>TTL (Time to Live) trong NoSQL l\u00e0 g\u00ec v\u00e0 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 l\u00e0m g\u00ec?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">TTL (Time to Live) l\u00e0 m\u1ed9t t\u00ednh n\u0103ng trong NoSQL cho ph\u00e9p b\u1ea1n \u0111\u1eb7t th\u1eddi gian t\u1ed3n t\u1ea1i cho d\u1eef li\u1ec7u. Khi th\u1eddi gian TTL h\u1ebft h\u1ea1n, d\u1eef li\u1ec7u s\u1ebd t\u1ef1 \u0111\u1ed9ng b\u1ecb x\u00f3a kh\u1ecfi c\u01a1 s\u1edf d\u1eef li\u1ec7u. TTL \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 qu\u1ea3n l\u00fd d\u1eef li\u1ec7u t\u1ea1m th\u1eddi, gi\u1ea3m t\u1ea3i l\u01b0u tr\u1eef v\u00e0 t\u1ef1 \u0111\u1ed9ng h\u00f3a vi\u1ec7c d\u1ecdn d\u1eb9p d\u1eef li\u1ec7u kh\u00f4ng c\u1ea7n thi\u1ebft.<\/span><\/p>\n<h4><b>C\u00e1ch ho\u1ea1t \u0111\u1ed9ng c\u1ee7a TTL<\/b><\/h4>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Khi m\u1ed9t t\u00e0i li\u1ec7u, b\u1ea3n ghi, ho\u1eb7c m\u1ee5c d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c th\u00eam v\u00e0o c\u01a1 s\u1edf d\u1eef li\u1ec7u, b\u1ea1n c\u00f3 th\u1ec3 \u0111\u1eb7t m\u1ed9t gi\u00e1 tr\u1ecb TTL (t\u00ednh b\u1eb1ng gi\u00e2y, ph\u00fat ho\u1eb7c gi\u1edd).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">H\u1ec7 th\u1ed1ng NoSQL s\u1ebd theo d\u00f5i th\u1eddi gian t\u1ed3n t\u1ea1i c\u1ee7a d\u1eef li\u1ec7u n\u00e0y. Khi th\u1eddi gian TTL h\u1ebft h\u1ea1n, c\u01a1 s\u1edf d\u1eef li\u1ec7u s\u1ebd t\u1ef1 \u0111\u1ed9ng x\u00f3a d\u1eef li\u1ec7u m\u00e0 kh\u00f4ng c\u1ea7n can thi\u1ec7p th\u1ee7 c\u00f4ng.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">TTL th\u01b0\u1eddng d\u1ef1a tr\u00ean m\u1ed9t tr\u01b0\u1eddng c\u1ee5 th\u1ec3 (v\u00ed d\u1ee5:<\/span><span style=\"font-weight: 400;\"> expiration_time<\/span><span style=\"font-weight: 400;\">) ho\u1eb7c th\u1eddi gian k\u1ec3 t\u1eeb khi d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c t\u1ea1o.<\/span><\/li>\n<\/ul>\n<h4><b>\u1ee8ng d\u1ee5ng c\u1ee7a TTL trong NoSQL<\/b><\/h4>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Qu\u1ea3n l\u00fd d\u1eef li\u1ec7u t\u1ea1m th\u1eddi<\/b><span style=\"font-weight: 400;\">: TTL r\u1ea5t h\u1eefu \u00edch trong c\u00e1c \u1ee9ng d\u1ee5ng l\u01b0u tr\u1eef d\u1eef li\u1ec7u t\u1ea1m th\u1eddi, nh\u01b0 session c\u1ee7a ng\u01b0\u1eddi d\u00f9ng, m\u00e3 x\u00e1c minh (OTP) ho\u1eb7c b\u1ed9 nh\u1edb cache. V\u00ed d\u1ee5: M\u1ed9t \u1ee9ng d\u1ee5ng web c\u00f3 th\u1ec3 l\u01b0u session c\u1ee7a ng\u01b0\u1eddi d\u00f9ng v\u1edbi TTL l\u00e0 30 ph\u00fat. Sau 30 ph\u00fat, session s\u1ebd t\u1ef1 \u0111\u1ed9ng b\u1ecb x\u00f3a.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>D\u1ecdn d\u1eb9p d\u1eef li\u1ec7u c\u0169<\/b><span style=\"font-weight: 400;\">: TTL gi\u00fap t\u1ef1 \u0111\u1ed9ng x\u00f3a d\u1eef li\u1ec7u kh\u00f4ng c\u00f2n c\u1ea7n thi\u1ebft, gi\u1ea3m g\u00e1nh n\u1eb7ng l\u01b0u tr\u1eef v\u00e0 t\u0103ng hi\u1ec7u su\u1ea5t. V\u00ed d\u1ee5: L\u01b0u tr\u1eef l\u1ecbch s\u1eed giao d\u1ecbch trong 90 ng\u00e0y, sau \u0111\u00f3 t\u1ef1 \u0111\u1ed9ng x\u00f3a.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Qu\u1ea3n l\u00fd b\u1ed9 nh\u1edb \u0111\u1ec7m (Cache Management)<\/b><span style=\"font-weight: 400;\">: TTL th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c h\u1ec7 th\u1ed1ng b\u1ed9 nh\u1edb \u0111\u1ec7m (cache) \u0111\u1ec3 x\u00f3a c\u00e1c b\u1ea3n ghi ho\u1eb7c t\u00e0i nguy\u00ean c\u0169. \u0110i\u1ec1u n\u00e0y gi\u00fap \u0111\u1ea3m b\u1ea3o b\u1ed9 nh\u1edb \u0111\u1ec7m lu\u00f4n ch\u1ee9a d\u1eef li\u1ec7u m\u1edbi v\u00e0 c\u00f3 gi\u00e1 tr\u1ecb. V\u00ed d\u1ee5: Redis s\u1eed d\u1ee5ng TTL \u0111\u1ec3 t\u1ef1 \u0111\u1ed9ng x\u00f3a c\u00e1c key-value \u0111\u00e3 h\u1ebft h\u1ea1n trong b\u1ed9 nh\u1edb \u0111\u1ec7m, \u0111\u1ea3m b\u1ea3o d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt li\u00ean t\u1ee5c.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Qu\u1ea3n l\u00fd th\u00f4ng b\u00e1o \u0111\u1ea9y (Push Notifications)<\/b><span style=\"font-weight: 400;\">: TTL c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong h\u1ec7 th\u1ed1ng th\u00f4ng b\u00e1o \u0111\u1ea9y, n\u01a1i c\u00e1c tin nh\u1eafn ho\u1eb7c th\u00f4ng b\u00e1o ch\u1ec9 c\u00f3 gi\u00e1 tr\u1ecb trong m\u1ed9t kho\u1ea3ng th\u1eddi gian c\u1ee5 th\u1ec3. V\u00ed d\u1ee5: M\u1ed9t h\u1ec7 th\u1ed1ng g\u1eedi th\u00f4ng b\u00e1o gi\u1ea3m gi\u00e1 cho ng\u01b0\u1eddi d\u00f9ng v\u1edbi TTL l\u00e0 24 gi\u1edd. Sau kho\u1ea3ng th\u1eddi gian n\u00e0y, th\u00f4ng b\u00e1o s\u1ebd t\u1ef1 \u0111\u1ed9ng b\u1ecb x\u00f3a \u0111\u1ec3 tr\u00e1nh g\u1eedi c\u00e1c th\u00f4ng tin kh\u00f4ng c\u00f2n h\u1ee3p l\u1ec7.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">C\u00e1ch m\u1ed9t s\u1ed1 h\u1ec7 qu\u1ea3n tr\u1ecb c\u01a1 s\u1edf d\u1eef li\u1ec7u s\u1eed d\u1ee5ng TTL:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Redis<\/b><span style=\"font-weight: 400;\">: H\u1ed7 tr\u1ee3 TTL tr\u00ean m\u1ed7i kh\u00f3a (key) b\u1eb1ng l\u1ec7nh Expire, gi\u00fap qu\u1ea3n l\u00fd b\u1ed9 nh\u1edb cache hi\u1ec7u qu\u1ea3.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>MongoDB<\/b><span style=\"font-weight: 400;\">: Cung c\u1ea5p TTL Index, cho ph\u00e9p x\u00f3a c\u00e1c t\u00e0i li\u1ec7u trong m\u1ed9t b\u1ed9 s\u01b0u t\u1eadp (collection) d\u1ef1a tr\u00ean gi\u00e1 tr\u1ecb th\u1eddi gian \u0111\u01b0\u1ee3c \u0111\u1eb7t trong tr\u01b0\u1eddng TTL.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Cassandra<\/b><span style=\"font-weight: 400;\">: TTL c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111\u1eb7t khi ch\u00e8n d\u1eef li\u1ec7u, v\u00e0 h\u1ec7 th\u1ed1ng s\u1ebd t\u1ef1 \u0111\u1ed9ng x\u00f3a d\u1eef li\u1ec7u khi TTL h\u1ebft h\u1ea1n.<\/span><\/li>\n<\/ul>\n<h3><b>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 x\u1eed l\u00fd bottleneck trong h\u1ec7 th\u1ed1ng write-heavy?<\/b><\/h3>\n<p><b>Bottleneck<\/b><span style=\"font-weight: 400;\"> l\u00e0 \u0111i\u1ec3m ngh\u1ebdn trong h\u1ec7 th\u1ed1ng, n\u01a1i t\u00e0i nguy\u00ean ho\u1eb7c th\u00e0nh ph\u1ea7n c\u1ee5 th\u1ec3 (nh\u01b0 CPU, b\u1ed9 nh\u1edb, \u1ed5 c\u1ee9ng, ho\u1eb7c m\u1ea1ng) b\u1ecb qu\u00e1 t\u1ea3i d\u1eabn \u0111\u1ebfn hi\u1ec7n t\u01b0\u1ee3ng ngh\u1ebdn c\u1ed5 chai, l\u00e0m gi\u1ea3m hi\u1ec7u su\u1ea5t t\u1ed5ng th\u1ec3 c\u1ee7a to\u00e0n b\u1ed9 h\u1ec7 th\u1ed1ng. Trong b\u1ed1i c\u1ea3nh NoSQL, bottleneck th\u01b0\u1eddng x\u1ea3y ra khi kh\u1ed1i l\u01b0\u1ee3ng ghi d\u1eef li\u1ec7u (write operations) v\u01b0\u1ee3t qu\u00e1 kh\u1ea3 n\u0103ng x\u1eed l\u00fd c\u1ee7a h\u1ec7 th\u1ed1ng.<\/span><\/p>\n<p><b>Write-heavy<\/b><span style=\"font-weight: 400;\"> \u0111\u1ec1 c\u1eadp \u0111\u1ebfn c\u00e1c h\u1ec7 th\u1ed1ng m\u00e0 kh\u1ed1i l\u01b0\u1ee3ng ghi d\u1eef li\u1ec7u (write requests) chi\u1ebfm ph\u1ea7n l\u1edbn so v\u1edbi c\u00e1c thao t\u00e1c \u0111\u1ecdc (read requests). C\u00e1c \u1ee9ng d\u1ee5ng nh\u01b0 ghi log, theo d\u00f5i s\u1ef1 ki\u1ec7n th\u1eddi gian th\u1ef1c, ho\u1eb7c h\u1ec7 th\u1ed1ng IoT th\u01b0\u1eddng c\u00f3 \u0111\u1eb7c \u0111i\u1ec3m write-heavy.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">M\u1ed9t s\u1ed1 c\u00e1ch x\u1eed l\u00fd bottleneck trong h\u1ec7 th\u1ed1ng write-heavy l\u00e0:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>T\u1ed1i \u01b0u h\u00f3a c\u1ea5u tr\u00fac d\u1eef li\u1ec7u v\u00e0 ghi \u0111\u1ed3ng lo\u1ea1t (Batch Writes)<\/b><span style=\"font-weight: 400;\">: Thay v\u00ec ghi d\u1eef li\u1ec7u t\u1eebng b\u1ea3n ghi ri\u00eang l\u1ebb, h\u00e3y ghi theo l\u00f4 (batch) s\u1ebd gi\u00fap gi\u1ea3m s\u1ed1 l\u01b0\u1ee3ng k\u1ebft n\u1ed1i v\u00e0 thao t\u00e1c ghi, t\u0103ng hi\u1ec7u su\u1ea5t t\u1ed5ng th\u1ec3. V\u00ed d\u1ee5 nh\u01b0 trong Cassandra c\u00f3 h\u1ed7 tr\u1ee3 batch writes \u0111\u1ec3 t\u1ed1i \u01b0u hi\u1ec7u su\u1ea5t.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Ph\u00e2n m\u1ea3nh d\u1eef li\u1ec7u (Sharding)<\/b><span style=\"font-weight: 400;\">: Ph\u00e2n chia d\u1eef li\u1ec7u th\u00e0nh c\u00e1c shard nh\u1ecf h\u01a1n v\u00e0 ph\u00e2n ph\u1ed1i ch\u00fang tr\u00ean nhi\u1ec1u m\u00e1y ch\u1ee7. \u0110i\u1ec1u n\u00e0y gi\u00fap chia t\u1ea3i c\u00f4ng vi\u1ec7c ghi gi\u1eefa c\u00e1c m\u00e1y ch\u1ee7 kh\u00e1c nhau, gi\u1ea3m \u00e1p l\u1ef1c cho t\u1eebng m\u00e1y. L\u01b0u \u00fd l\u00e0 c\u1ea7n ch\u1ecdn shard key ph\u00f9 h\u1ee3p \u0111\u1ec3 tr\u00e1nh m\u1ea5t c\u00e2n b\u1eb1ng t\u1ea3i.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>S\u1eed d\u1ee5ng b\u1ed9 nh\u1edb \u0111\u1ec7m (Write Cache)<\/b><span style=\"font-weight: 400;\">: D\u1eef li\u1ec7u ghi t\u1ea1m th\u1eddi \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef trong b\u1ed9 nh\u1edb \u0111\u1ec7m (cache) tr\u01b0\u1edbc khi \u0111\u01b0\u1ee3c ghi v\u00e0o \u1ed5 c\u1ee9ng. \u0110i\u1ec1u n\u00e0y gi\u1ea3m \u0111\u1ed9 tr\u1ec5 v\u00e0 t\u0103ng t\u1ed1c \u0111\u1ed9 ghi. V\u00ed d\u1ee5 nh\u01b0 Redis th\u01b0\u1eddng \u0111\u01b0\u1ee3c d\u00f9ng nh\u01b0 m\u1ed9t write cache cho c\u00e1c h\u1ec7 th\u1ed1ng NoSQL.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>T\u1ed1i \u01b0u h\u00f3a ch\u1ec9 m\u1ee5c (Index Optimization)<\/b><span style=\"font-weight: 400;\">: S\u1eed d\u1ee5ng \u00edt ch\u1ec9 m\u1ee5c h\u01a1n tr\u00ean c\u00e1c tr\u01b0\u1eddng d\u1eef li\u1ec7u ghi nhi\u1ec1u v\u00ec ch\u1ec9 m\u1ee5c qu\u00e1 nhi\u1ec1u l\u00e0m t\u0103ng chi ph\u00ed ghi d\u1eef li\u1ec7u.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Scaling Horizontal (M\u1edf r\u1ed9ng ngang)<\/b><span style=\"font-weight: 400;\">: Th\u00eam nhi\u1ec1u m\u00e1y ch\u1ee7 \u0111\u1ec3 x\u1eed l\u00fd t\u1ea3i ghi l\u1edbn. NoSQL h\u1ed7 tr\u1ee3 m\u1edf r\u1ed9ng ngang d\u1ec5 d\u00e0ng, gi\u00fap t\u0103ng kh\u1ea3 n\u0103ng x\u1eed l\u00fd write-heavy.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Log-structured Storage<\/b><span style=\"font-weight: 400;\">: l\u00e0 ph\u01b0\u01a1ng ph\u00e1p s\u1eed d\u1ee5ng c\u1ea5u tr\u00fac l\u01b0u tr\u1eef theo log, trong \u0111\u00f3 c\u00e1c b\u1ea3n ghi m\u1edbi \u0111\u01b0\u1ee3c th\u00eam tu\u1ea7n t\u1ef1 v\u00e0o cu\u1ed1i file, gi\u00fap gi\u1ea3m chi ph\u00ed ghi ng\u1eabu nhi\u00ean.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Ghi kh\u00f4ng \u0111\u1ed3ng b\u1ed9 (Asynchronous Writes)<\/b><span style=\"font-weight: 400;\">: C\u00e1c thao t\u00e1c ghi kh\u00f4ng quan tr\u1ecdng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c chuy\u1ec3n sang c\u00e1c quy tr\u00ecnh kh\u00f4ng \u0111\u1ed3ng b\u1ed9 ho\u1eb7c h\u00e0ng \u0111\u1ee3i (queue). Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y gi\u00fap t\u00e1ch bi\u1ec7t ghi d\u1eef li\u1ec7u kh\u1ecfi lu\u1ed3ng ch\u00ednh c\u1ee7a \u1ee9ng d\u1ee5ng, t\u1eeb \u0111\u00f3 c\u1ea3i thi\u1ec7n kh\u1ea3 n\u0103ng ph\u1ea3n h\u1ed3i v\u00e0 m\u1edf r\u1ed9ng.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Write-ahead Logging (WAL)<\/b><span style=\"font-weight: 400;\">: S\u1eed d\u1ee5ng WAL \u0111\u1ec3 ghi log thay \u0111\u1ed5i d\u1eef li\u1ec7u tr\u01b0\u1edbc khi ghi tr\u1ef1c ti\u1ebfp v\u00e0o b\u1ed9 nh\u1edb ch\u00ednh, t\u1eeb \u0111\u00f3 gi\u00fap \u0111\u1ea3m b\u1ea3o t\u00ednh b\u1ec1n v\u1eefng (durability) c\u1ee7a d\u1eef li\u1ec7u v\u00e0 gi\u1ea3m I\/O ng\u1eabu nhi\u00ean tr\u00ean \u0111\u0129a trong qu\u00e1 tr\u00ecnh ghi.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Ch\u00e8n d\u1eef li\u1ec7u h\u00e0ng lo\u1ea1t (Bulk Inserts)<\/b><span style=\"font-weight: 400;\">: Thay v\u00ec ch\u00e8n t\u1eebng d\u00f2ng d\u1eef li\u1ec7u, s\u1eed d\u1ee5ng bulk insert \u0111\u1ec3 ch\u00e8n d\u1eef li\u1ec7u theo nh\u00f3m l\u1edbn trong m\u1ed9t l\u1ea7n giao d\u1ecbch. Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y kh\u00f4ng gi\u1ea3m chi ph\u00ed ph\u00e1t sinh t\u1eeb vi\u1ec7c t\u1ea1o nhi\u1ec1u giao d\u1ecbch nh\u1ecf m\u00e0 c\u00f2n c\u1ea3i thi\u1ec7n throughput c\u1ee7a h\u1ec7 th\u1ed1ng.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Ph\u00e2n v\u00f9ng d\u1eef li\u1ec7u (Partitioning)<\/b><span style=\"font-weight: 400;\">: Ph\u00e2n chia c\u00e1c b\u1ea3ng l\u1edbn th\u00e0nh c\u00e1c ph\u1ea7n nh\u1ecf h\u01a1n (partition) \u0111\u1ec3 ph\u00e2n t\u00e1n t\u1ea3i ghi gi\u1eefa nhi\u1ec1u \u1ed5 \u0111\u0129a ho\u1eb7c m\u00e1y ch\u1ee7. Ph\u00e2n v\u00f9ng theo chi\u1ec1u ngang (horizontal partitioning) s\u1ebd gi\u00fap gi\u1ea3m t\u00ecnh tr\u1ea1ng tranh ch\u1ea5p v\u00e0 c\u1ea3i thi\u1ec7n kh\u1ea3 n\u0103ng x\u1eed l\u00fd \u0111\u1ed3ng th\u1eddi.<\/span><\/li>\n<\/ul>\n<h3><b>C\u00e1c c\u00f4ng c\u1ee5 h\u1ed7 tr\u1ee3 x\u1eed l\u00fd write-heavy trong NoSQL<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">C\u00e1c h\u1ec7 th\u1ed1ng write-heavy \u0111\u00f2i h\u1ecfi c\u01a1 s\u1edf d\u1eef li\u1ec7u NoSQL c\u00f3 kh\u1ea3 n\u0103ng t\u1ed1i \u01b0u h\u00f3a cho kh\u1ed1i l\u01b0\u1ee3ng l\u1edbn thao t\u00e1c ghi d\u1eef li\u1ec7u. M\u1ed9t s\u1ed1 c\u00f4ng c\u1ee5 NoSQL \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1eb7c bi\u1ec7t \u0111\u1ec3 x\u1eed l\u00fd hi\u1ec7u qu\u1ea3 c\u00e1c t\u00e1c v\u1ee5 write-heavy nh\u01b0:\u00a0<\/span><\/p>\n<ol>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Cassandra<\/b><span style=\"font-weight: 400;\">: s\u1eed d\u1ee5ng ki\u1ebfn tr\u00fac ph\u00e2n t\u00e1n peer-to-peer v\u00e0 c\u01a1 ch\u1ebf l\u01b0u tr\u1eef log-structured, gi\u00fap ghi d\u1eef li\u1ec7u tu\u1ea7n t\u1ef1 v\u00e0o \u1ed5 \u0111\u0129a m\u00e0 kh\u00f4ng c\u1ea7n ghi \u0111\u00e8. C\u00e1c thao t\u00e1c ghi \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a th\u00f4ng qua batch writes, gi\u1ea3m chi ph\u00ed khi x\u1eed l\u00fd kh\u1ed1i l\u01b0\u1ee3ng l\u1edbn y\u00eau c\u1ea7u ghi. Ngo\u00e0i ra, Cassandra h\u1ed7 tr\u1ee3 m\u1edf r\u1ed9ng ngang, gi\u00fap ph\u00e2n ph\u1ed1i t\u1ea3i ghi gi\u1eefa nhi\u1ec1u m\u00e1y ch\u1ee7, gi\u1eef hi\u1ec7u su\u1ea5t \u1ed5n \u0111\u1ecbnh ngay c\u1ea3 khi d\u1eef li\u1ec7u t\u0103ng tr\u01b0\u1edfng l\u1edbn.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Redis<\/b><span style=\"font-weight: 400;\">: L\u00e0 m\u1ed9t c\u01a1 s\u1edf d\u1eef li\u1ec7u in-memory, Redis x\u1eed l\u00fd write-heavy b\u1eb1ng c\u00e1ch l\u01b0u tr\u1eef d\u1eef li\u1ec7u trong b\u1ed9 nh\u1edb t\u1ea1m th\u1eddi, gi\u00fap thao t\u00e1c ghi di\u1ec5n ra v\u1edbi \u0111\u1ed9 tr\u1ec5 r\u1ea5t th\u1ea5p. Redis h\u1ed7 tr\u1ee3 c\u01a1 ch\u1ebf append-only file (AOF) \u0111\u1ec3 ghi d\u1eef li\u1ec7u v\u00e0o \u1ed5 \u0111\u0129a tu\u1ea7n t\u1ef1, \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 b\u1ec1n d\u1eef li\u1ec7u m\u00e0 kh\u00f4ng l\u00e0m gi\u1ea3m hi\u1ec7u su\u1ea5t x\u1eed l\u00fd ghi.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>MongoDB<\/b><span style=\"font-weight: 400;\">: t\u1ed1i \u01b0u h\u00f3a ghi d\u1eef li\u1ec7u trong h\u1ec7 th\u1ed1ng write-heavy b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng replica set \u0111\u1ec3 ph\u00e2n ph\u1ed1i thao t\u00e1c ghi gi\u1eefa c\u00e1c n\u00fat v\u00e0 sharding \u0111\u1ec3 chia nh\u1ecf d\u1eef li\u1ec7u theo shard key. C\u01a1 ch\u1ebf write-concern cho ph\u00e9p c\u1ea5u h\u00ecnh m\u1ee9c \u0111\u1ed9 cam k\u1ebft c\u1ee7a thao t\u00e1c ghi, t\u1eeb m\u1ee9c t\u1ed1i thi\u1ec3u (ghi t\u1ea1i m\u1ed9t n\u00fat) \u0111\u1ebfn m\u1ea1nh m\u1ebd (ghi tr\u00ean nhi\u1ec1u n\u00fat), gi\u00fap linh ho\u1ea1t theo nhu c\u1ea7u c\u1ee7a h\u1ec7 th\u1ed1ng.<\/span><\/li>\n<\/ol>\n<h3><b>L\u1ef1a ch\u1ecdn c\u1ea5u tr\u00fac d\u1eef li\u1ec7u n\u00e0o cho hi\u1ec7u su\u1ea5t write cao?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">\u0110\u1ec3 \u0111\u1ea1t hi\u1ec7u su\u1ea5t ghi (write) cao, vi\u1ec7c ch\u1ecdn c\u1ea5u tr\u00fac d\u1eef li\u1ec7u ph\u00f9 h\u1ee3p l\u00e0 r\u1ea5t quan tr\u1ecdng. C\u00e1c c\u1ea5u tr\u00fac d\u1eef li\u1ec7u sau \u0111\u00e2y th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong h\u1ec7 th\u1ed1ng NoSQL nh\u1edd kh\u1ea3 n\u0103ng t\u1ed1i \u01b0u h\u00f3a cho thao t\u00e1c ghi:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Log-Structured Storage<\/b><span style=\"font-weight: 400;\">: C\u1ea5u tr\u00fac n\u00e0y ghi d\u1eef li\u1ec7u tu\u1ea7n t\u1ef1 v\u00e0o m\u1ed9t file log tr\u00ean \u1ed5 \u0111\u0129a thay v\u00ec ghi ng\u1eabu nhi\u00ean v\u00e0o nhi\u1ec1u v\u1ecb tr\u00ed. C\u00e1ch ti\u1ebfp c\u1eadn n\u00e0y gi\u1ea3m chi ph\u00ed ghi I\/O v\u00e0 t\u1eadn d\u1ee5ng t\u1ed1i \u0111a hi\u1ec7u su\u1ea5t c\u1ee7a \u1ed5 \u0111\u0129a t\u1eeb t\u00ednh ho\u1eb7c SSD. V\u00ec kh\u00f4ng c\u1ea7n ghi \u0111\u00e8 nhi\u1ec1u l\u1ea7n, log-structured storage r\u1ea5t ph\u00f9 h\u1ee3p cho c\u00e1c h\u1ec7 th\u1ed1ng write-heavy v\u1edbi y\u00eau c\u1ea7u cao v\u1ec1 t\u1ed1c \u0111\u1ed9 ghi. Log-structured Storage th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c c\u01a1 s\u1edf d\u1eef li\u1ec7u nh\u01b0 Cassandra v\u00e0 HBase \u0111\u1ec3 x\u1eed l\u00fd kh\u1ed1i l\u01b0\u1ee3ng l\u1edbn thao t\u00e1c ghi trong th\u1eddi gian ng\u1eafn.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>B\u1ed9 nh\u1edb \u0111\u1ec7m (In-Memory Data Store)<\/b><span style=\"font-weight: 400;\">: D\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u01b0u t\u1ea1m th\u1eddi trong RAM \u0111\u1ec3 x\u1eed l\u00fd nhanh c\u00e1c thao t\u00e1c ghi. Sau \u0111\u00f3, d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c \u0111\u1ed3ng b\u1ed9 h\u00f3a \u0111\u1ecbnh k\u1ef3 v\u00e0o \u1ed5 \u0111\u0129a ho\u1eb7c c\u01a1 s\u1edf d\u1eef li\u1ec7u ch\u00ednh \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o kh\u00f4ng b\u1ecb m\u1ea5t khi h\u1ec7 th\u1ed1ng g\u1eb7p s\u1ef1 c\u1ed1. C\u00e1ch ti\u1ebfp c\u1eadn n\u00e0y \u0111\u1eb7c bi\u1ec7t hi\u1ec7u qu\u1ea3 trong c\u00e1c \u1ee9ng d\u1ee5ng y\u00eau c\u1ea7u t\u1ed1c \u0111\u1ed9 nhanh v\u00e0 d\u1eef li\u1ec7u kh\u00f4ng c\u1ea7n t\u1ed3n t\u1ea1i l\u00e2u d\u00e0i. Redis v\u00e0 Memcached l\u00e0 nh\u1eefng v\u00ed d\u1ee5 \u0111i\u1ec3n h\u00ecnh c\u1ee7a c\u01a1 s\u1edf d\u1eef li\u1ec7u in-memory t\u1ed1i \u01b0u cho write-heavy.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Column-Family Store<\/b><span style=\"font-weight: 400;\">: Trong c\u1ea5u tr\u00fac n\u00e0y, d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c t\u1ed5 ch\u1ee9c v\u00e0 l\u01b0u tr\u1eef d\u01b0\u1edbi d\u1ea1ng c\u1ed9t thay v\u00ec h\u00e0ng nh\u01b0 trong c\u01a1 s\u1edf d\u1eef li\u1ec7u quan h\u1ec7. Khi c\u1ea7n ghi d\u1eef li\u1ec7u, ch\u1ec9 c\u00e1c c\u1ed9t thay \u0111\u1ed5i \u0111\u01b0\u1ee3c ghi l\u1ea1i, gi\u00fap gi\u1ea3m kh\u1ed1i l\u01b0\u1ee3ng thao t\u00e1c ghi so v\u1edbi vi\u1ec7c ghi to\u00e0n b\u1ed9 h\u00e0ng. Nh\u1edd \u0111\u00f3 column-family store ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng ghi d\u1eef li\u1ec7u l\u1edbn nh\u01b0ng ch\u1ec9 thay \u0111\u1ed5i m\u1ed9t ph\u1ea7n d\u1eef li\u1ec7u trong m\u1ed7i b\u1ea3n ghi. C\u00e1c c\u01a1 s\u1edf d\u1eef li\u1ec7u nh\u01b0 HBase v\u00e0 Cassandra s\u1eed d\u1ee5ng c\u1ea5u tr\u00fac n\u00e0y \u0111\u1ec3 t\u1ed1i \u01b0u h\u00f3a ghi v\u00e0 l\u01b0u tr\u1eef.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Key-Value Stor<\/b><span style=\"font-weight: 400;\">e: l\u00e0 m\u1ed9t trong nh\u1eefng c\u1ea5u tr\u00fac \u0111\u01a1n gi\u1ea3n nh\u1ea5t, l\u01b0u tr\u1eef d\u1eef li\u1ec7u d\u01b0\u1edbi d\u1ea1ng c\u1eb7p kh\u00f3a-gi\u00e1 tr\u1ecb. Khi ghi d\u1eef li\u1ec7u, c\u01a1 s\u1edf d\u1eef li\u1ec7u ch\u1ec9 c\u1ea7n l\u01b0u gi\u00e1 tr\u1ecb t\u01b0\u01a1ng \u1ee9ng v\u1edbi kh\u00f3a, m\u00e0 kh\u00f4ng c\u1ea7n x\u1eed l\u00fd c\u00e1c c\u1ea5u tr\u00fac ph\u1ee9c t\u1ea1p kh\u00e1c, gi\u00fap gi\u1ea3m chi ph\u00ed x\u1eed l\u00fd v\u00e0 t\u0103ng t\u1ed1c \u0111\u1ed9 ghi. C\u00e1c c\u01a1 s\u1edf d\u1eef li\u1ec7u nh\u01b0 DynamoDB v\u00e0 Riak, s\u1eed d\u1ee5ng c\u1ea5u tr\u00fac key-value v\u00e0 l\u00e0 l\u1ef1a ch\u1ecdn ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng write-heavy nh\u1edd thi\u1ebft k\u1ebf \u0111\u01a1n gi\u1ea3n nh\u01b0ng hi\u1ec7u qu\u1ea3.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>LSM Trees (Log-Structured Merge Trees<\/b><span style=\"font-weight: 400;\">): LSM Trees ghi d\u1eef li\u1ec7u m\u1edbi v\u00e0o b\u1ed9 nh\u1edb (RAM) tr\u01b0\u1edbc khi t\u1ed5 ch\u1ee9c l\u1ea1i th\u00e0nh c\u00e1c m\u1ee9c (levels) v\u00e0 ghi tu\u1ea7n t\u1ef1 v\u00e0o \u1ed5 \u0111\u0129a. B\u1eb1ng c\u00e1ch gi\u1ea3m s\u1ed1 l\u1ea7n ghi ng\u1eabu nhi\u00ean v\u00e0 ch\u1ec9 x\u1eed l\u00fd d\u1eef li\u1ec7u khi c\u1ea7n, c\u1ea5u tr\u00fac n\u00e0y gi\u00fap t\u0103ng hi\u1ec7u su\u1ea5t ghi \u0111\u00e1ng k\u1ec3. LSM Trees th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c c\u01a1 s\u1edf d\u1eef li\u1ec7u write-heavy v\u00ec kh\u1ea3 n\u0103ng ghi nhanh, k\u1ebft h\u1ee3p v\u1edbi kh\u1ea3 n\u0103ng l\u01b0u tr\u1eef d\u1eef li\u1ec7u l\u1edbn m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3. C\u00e1c c\u01a1 s\u1edf d\u1eef li\u1ec7u s\u1eed d\u1ee5ng LSM Trees l\u00e0 RocksDB v\u00e0 LevelDB.<\/span><\/li>\n<\/ul>\n<h3><b>Khi n\u00e0o n\u00ean s\u1eed d\u1ee5ng batch processing trong NoSQL?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Batch Processing l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt x\u1eed l\u00fd d\u1eef li\u1ec7u trong \u0111\u00f3 nhi\u1ec1u thao t\u00e1c ho\u1eb7c c\u00f4ng vi\u1ec7c \u0111\u01b0\u1ee3c gom l\u1ea1i th\u00e0nh m\u1ed9t l\u00f4 (batch) v\u00e0 th\u1ef1c hi\u1ec7n c\u00f9ng l\u00fac thay v\u00ec x\u1eed l\u00fd t\u1eebng thao t\u00e1c ri\u00eang l\u1ebb. Thay v\u00ec g\u1eedi y\u00eau c\u1ea7u \u0111\u1ebfn c\u01a1 s\u1edf d\u1eef li\u1ec7u cho t\u1eebng b\u1ea3n ghi, batch processing th\u1ef1c hi\u1ec7n m\u1ed9t y\u00eau c\u1ea7u duy nh\u1ea5t \u0111\u1ec3 x\u1eed l\u00fd to\u00e0n b\u1ed9 d\u1eef li\u1ec7u trong l\u00f4, gi\u00fap gi\u1ea3m chi ph\u00ed v\u1ec1 t\u00e0i nguy\u00ean, m\u1ea1ng v\u00e0 th\u1eddi gian.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y ph\u00f9 h\u1ee3p trong c\u00e1c tr\u01b0\u1eddng h\u1ee3p y\u00eau c\u1ea7u \u01b0u ti\u00ean hi\u1ec7u su\u1ea5t ghi v\u00e0 x\u1eed l\u00fd d\u1eef li\u1ec7u, \u0111\u1eb7c bi\u1ec7t l\u00e0 khi h\u1ec7 th\u1ed1ng c\u1ea7n gi\u1ea3m s\u1ed1 l\u01b0\u1ee3ng k\u1ebft n\u1ed1i ho\u1eb7c thao t\u00e1c truy v\u1ea5n \u0111\u1ebfn c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/span><\/p>\n<h4><b>C\u00e1c tr\u01b0\u1eddng h\u1ee3p n\u00ean s\u1eed d\u1ee5ng Batch Processing<\/b><\/h4>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>X\u1eed l\u00fd kh\u1ed1i l\u01b0\u1ee3ng l\u1edbn d\u1eef li\u1ec7u<\/b><span style=\"font-weight: 400;\">:<\/span> <span style=\"font-weight: 400;\">Khi c\u1ea7n nh\u1eadp ho\u1eb7c ghi h\u00e0ng tri\u1ec7u b\u1ea3n ghi v\u00e0o c\u01a1 s\u1edf d\u1eef li\u1ec7u, nh\u01b0 t\u1ea3i d\u1eef li\u1ec7u t\u1eeb file log, backup, ho\u1eb7c h\u1ec7 th\u1ed1ng ETL. Batch processing cho ph\u00e9p t\u1ed1i \u01b0u h\u00f3a vi\u1ec7c x\u1eed l\u00fd s\u1ed1 l\u01b0\u1ee3ng l\u1edbn d\u1eef li\u1ec7u m\u00e0 kh\u00f4ng l\u00e0m h\u1ec7 th\u1ed1ng b\u1ecb qu\u00e1 t\u1ea3i.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>T\u1ed1i \u01b0u h\u00f3a hi\u1ec7u su\u1ea5t ghi<\/b><span style=\"font-weight: 400;\">: Trong h\u1ec7 th\u1ed1ng write-heavy, batch processing gi\u00fap gi\u1ea3m s\u1ed1 l\u01b0\u1ee3ng thao t\u00e1c ghi \u0111\u01a1n l\u1ebb, t\u1eeb \u0111\u00f3 gi\u1ea3m chi ph\u00ed I\/O v\u00e0 t\u0103ng t\u1ed1c \u0111\u1ed9 ghi d\u1eef li\u1ec7u.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Gi\u1ea3m chi ph\u00ed m\u1ea1ng<\/b><span style=\"font-weight: 400;\">: N\u1ebfu c\u01a1 s\u1edf d\u1eef li\u1ec7u NoSQL \u0111\u01b0\u1ee3c tri\u1ec3n khai tr\u00ean nhi\u1ec1u n\u00fat ho\u1eb7c tr\u00ean \u0111\u00e1m m\u00e2y (cloud), batch processing gi\u00fap gi\u1ea3m s\u1ed1 l\u01b0\u1ee3ng y\u00eau c\u1ea7u qua m\u1ea1ng b\u1eb1ng c\u00e1ch g\u1ed9p nhi\u1ec1u thao t\u00e1c trong m\u1ed9t k\u1ebft n\u1ed1i.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>X\u1eed l\u00fd d\u1eef li\u1ec7u \u0111\u1ecbnh k\u1ef3 ho\u1eb7c kh\u00f4ng th\u1eddi gian th\u1ef1c<\/b><span style=\"font-weight: 400;\">: Ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng kh\u00f4ng y\u00eau c\u1ea7u d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c x\u1eed l\u00fd ngay l\u1eadp t\u1ee9c, nh\u01b0 t\u1ed5ng h\u1ee3p d\u1eef li\u1ec7u h\u00e0ng ng\u00e0y, x\u1eed l\u00fd log ho\u1eb7c ph\u00e2n t\u00edch d\u1eef li\u1ec7u l\u1ecbch s\u1eed.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Khi c\u1ea7n duy tr\u00ec t\u00ednh nh\u1ea5t qu\u00e1n t\u1ea1m th\u1eddi<\/b><span style=\"font-weight: 400;\">: Batch processing cho ph\u00e9p h\u1ec7 th\u1ed1ng th\u1ef1c hi\u1ec7n nhi\u1ec1u thay \u0111\u1ed5i c\u00f9ng m\u1ed9t l\u00fac, gi\u00fap gi\u1ea3m kh\u1ea3 n\u0103ng x\u1ea3y ra xung \u0111\u1ed9t d\u1eef li\u1ec7u khi c\u00f3 nhi\u1ec1u thao t\u00e1c ghi \u0111\u1ed3ng th\u1eddi.<\/span><\/li>\n<\/ul>\n<h3><b>So s\u00e1nh NoSQL v\u00e0 SQL v\u1ec1 kh\u1ea3 n\u0103ng backup d\u1eef li\u1ec7u<\/b><\/h3>\n<table>\n<tbody>\n<tr>\n<td><b>Ti\u00eau ch\u00ed<\/b><\/td>\n<td><b>SQL<\/b><\/td>\n<td><b>NoSQL<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">C\u01a1 ch\u1ebf ho\u1ea1t \u0111\u1ed9ng<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Sao l\u01b0u to\u00e0n b\u1ed9 ho\u1eb7c t\u1eebng b\u1ea3ng v\u1edbi c\u00f4ng c\u1ee5 t\u00edch h\u1ee3p.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">&#8211; Sao l\u01b0u theo shard ho\u1eb7c c\u1ee5m (cluster).<\/span><\/p>\n<p><span style=\"font-weight: 400;\">&#8211; Backup ph\u00e2n t\u00e1n theo t\u1eebng n\u00fat.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">C\u00e1ch l\u01b0u tr\u1eef<\/span><\/td>\n<td><span style=\"font-weight: 400;\">D\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u01b0u t\u1eadp trung d\u01b0\u1edbi d\u1ea1ng file SQL ho\u1eb7c snapshot.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">L\u01b0u tr\u1eef d\u1eef li\u1ec7u ph\u00e2n t\u00e1n, th\u01b0\u1eddng l\u00e0 file binary ho\u1eb7c snapshot c\u1ee7a t\u1eebng n\u00fat.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Th\u1eddi gian backup<\/span><\/td>\n<td><span style=\"font-weight: 400;\">&#8211; Sao l\u01b0u nhanh v\u1edbi d\u1eef li\u1ec7u nh\u1ecf.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">&#8211; V\u1edbi d\u1eef li\u1ec7u l\u1edbn, c\u1ea7n nhi\u1ec1u th\u1eddi gian h\u01a1n.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">&#8211; Backup di\u1ec5n ra \u0111\u1ed3ng th\u1eddi tr\u00ean nhi\u1ec1u n\u00fat, nhanh h\u01a1n khi d\u1eef li\u1ec7u l\u1edbn.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Downtime khi backup<\/span><\/td>\n<td><span style=\"font-weight: 400;\">&#8211; C\u00f3 th\u1ec3 c\u1ea7n downtime \u0111\u1ec3 tr\u00e1nh xung \u0111\u1ed9t trong qu\u00e1 tr\u00ecnh sao l\u01b0u.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">&#8211; Kh\u00f4ng c\u1ea7n downtime, backup song song gi\u1eefa c\u00e1c n\u00fat trong h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">T\u00ednh nh\u1ea5t qu\u00e1n<\/span><\/td>\n<td><span style=\"font-weight: 400;\">&#8211; \u0110\u1ea3m b\u1ea3o nh\u1ea5t qu\u00e1n nh\u1edd giao d\u1ecbch ACID.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">&#8211; Ph\u1ee5 thu\u1ed9c v\u00e0o lo\u1ea1i NoSQL (strong ho\u1eb7c eventual consistency).<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">C\u00f4ng c\u1ee5 h\u1ed7 tr\u1ee3<\/span><\/td>\n<td><span style=\"font-weight: 400;\">&#8211; MySQL: <\/span><span style=\"font-weight: 400;\">mysqldump<\/span><span style=\"font-weight: 400;\">,<\/span><span style=\"font-weight: 400;\"> mysqlhotcopy<\/span><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">&#8211; PostgreSQL: <\/span><span style=\"font-weight: 400;\">pg_dump<\/span><span style=\"font-weight: 400;\">.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">&#8211; MongoDB: <\/span><span style=\"font-weight: 400;\">mongodump<\/span><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">&#8211; Cassandra: snapshot qua nodetool.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Chi ph\u00ed l\u01b0u tr\u1eef<\/span><\/td>\n<td><span style=\"font-weight: 400;\">T\u1ed1n dung l\u01b0\u1ee3ng l\u1edbn do backup t\u1eadp trung.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">L\u01b0u tr\u1eef hi\u1ec7u qu\u1ea3 h\u01a1n nh\u1edd n\u00e9n v\u00e0 ph\u00e2n m\u1ea3nh d\u1eef li\u1ec7u tr\u00ean nhi\u1ec1u n\u00fat.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">T\u1ef1 \u0111\u1ed9ng h\u00f3a<\/span><\/td>\n<td><span style=\"font-weight: 400;\">D\u1ec5 d\u00e0ng l\u00ean l\u1ecbch backup \u0111\u1ecbnh k\u1ef3 v\u1edbi c\u00f4ng c\u1ee5 t\u00edch h\u1ee3p (v\u00ed d\u1ee5 <\/span><span style=\"font-weight: 400;\">cron<\/span><span style=\"font-weight: 400;\">).<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Ph\u1ee5 thu\u1ed9c v\u00e0o d\u1ecbch v\u1ee5 ho\u1eb7c c\u00f4ng c\u1ee5 t\u00edch h\u1ee3p (v\u00ed d\u1ee5: MongoDB Ops Manager).<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Kh\u00f3 kh\u0103n v\u1edbi d\u1eef li\u1ec7u l\u1edbn ho\u1eb7c h\u1ec7 th\u1ed1ng ph\u1ee9c t\u1ea1p.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">D\u1ec5 m\u1edf r\u1ed9ng nh\u1edd backup ph\u00e2n t\u00e1n v\u00e0 \u0111\u1ed3ng th\u1eddi tr\u00ean nhi\u1ec1u m\u00e1y ch\u1ee7.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><b>So s\u00e1nh NoSQL v\u00e0 SQL v\u1ec1 kh\u1ea3 n\u0103ng restore d\u1eef li\u1ec7u<\/b><\/h3>\n<table>\n<tbody>\n<tr>\n<td><b>Ti\u00eau ch\u00ed<\/b><\/td>\n<td><b>SQL<\/b><\/td>\n<td><b>NoSQL<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">C\u01a1 ch\u1ebf ho\u1ea1t \u0111\u1ed9ng<\/span><\/td>\n<td><span style=\"font-weight: 400;\">D\u1ec5 d\u00e0ng b\u1eb1ng c\u00e1ch ch\u1ea1y file SQL ho\u1eb7c snapshot to\u00e0n b\u1ed9 c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">&#8211; Restore theo t\u1eebng shard ho\u1eb7c n\u00fat.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">&#8211; Y\u00eau c\u1ea7u \u0111\u1ed3ng b\u1ed9 h\u00f3a d\u1eef li\u1ec7u sau khi restore.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Th\u1eddi gian<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Nhanh n\u1ebfu d\u1eef li\u1ec7u nh\u1ecf, nh\u01b0ng v\u1edbi d\u1eef li\u1ec7u l\u1edbn c\u00f3 th\u1ec3 m\u1ea5t nhi\u1ec1u th\u1eddi gian.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">&#8211; Ph\u1ee5 thu\u1ed9c v\u00e0o s\u1ed1 l\u01b0\u1ee3ng n\u00fat v\u00e0 kh\u1ed1i l\u01b0\u1ee3ng d\u1eef li\u1ec7u ph\u00e2n t\u00e1n.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">&#8211; Th\u1eddi gian \u0111\u1ed3ng b\u1ed9 l\u00e2u h\u01a1n trong h\u1ec7 th\u1ed1ng l\u1edbn.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">T\u00ednh nh\u1ea5t qu\u00e1n<\/span><\/td>\n<td><span style=\"font-weight: 400;\">&#8211; \u0110\u1ea3m b\u1ea3o to\u00e0n v\u1eb9n d\u1eef li\u1ec7u nh\u1edd ACID.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">&#8211; D\u1ef1a v\u00e0o m\u1ee9c \u0111\u1ed9 nh\u1ea5t qu\u00e1n thi\u1ebft l\u1eadp tr\u01b0\u1edbc (strong ho\u1eb7c eventual consistency).<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Downtime khi restore<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Th\u01b0\u1eddng y\u00eau c\u1ea7u downtime khi kh\u00f4i ph\u1ee5c to\u00e0n b\u1ed9 c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Restore kh\u00f4ng c\u1ea7n downtime nh\u01b0ng y\u00eau c\u1ea7u th\u1eddi gian \u0111\u1ec3 \u0111\u1ed3ng b\u1ed9 d\u1eef li\u1ec7u.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Ph\u1ee5c h\u1ed3i t\u1eebng ph\u1ea7n<\/span><\/td>\n<td><span style=\"font-weight: 400;\">H\u1ed7 tr\u1ee3 t\u1ed1t, c\u00f3 th\u1ec3 ph\u1ee5c h\u1ed3i b\u1ea3ng ho\u1eb7c giao d\u1ecbch c\u1ee5 th\u1ec3.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Th\u01b0\u1eddng ph\u1ee5c h\u1ed3i theo shard ho\u1eb7c n\u00fat, kh\u00f3 kh\u0103n h\u01a1n khi ph\u1ee5c h\u1ed3i t\u1eebng ph\u1ea7n.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">C\u00f4ng c\u1ee5 h\u1ed7 tr\u1ee3<\/span><\/td>\n<td><span style=\"font-weight: 400;\">&#8211; MySQL: <\/span><span style=\"font-weight: 400;\">mysql &lt; backup.sql<\/span><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">&#8211; PostgreSQL: <\/span><span style=\"font-weight: 400;\">pg_restore<\/span><span style=\"font-weight: 400;\">.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">&#8211; MongoDB: <\/span><span style=\"font-weight: 400;\">mongorestore<\/span><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">&#8211; Cassandra: <\/span><span style=\"font-weight: 400;\">nodetool refresh<\/span><span style=\"font-weight: 400;\">.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">\u0110\u1ed9 ph\u1ee9c t\u1ea1p<\/span><\/td>\n<td><span style=\"font-weight: 400;\">D\u1ec5 d\u00e0ng nh\u1edd c\u00e1c c\u00f4ng c\u1ee5 chu\u1ea9n h\u00f3a.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Ph\u1ee9c t\u1ea1p h\u01a1n do d\u1eef li\u1ec7u ph\u00e2n t\u00e1n, c\u1ea7n qu\u1ea3n l\u00fd \u0111\u1ed3ng b\u1ed9 gi\u1eefa c\u00e1c n\u00fat.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"font-weight: 400;\">SQL d\u1ec5 d\u00e0ng h\u01a1n trong vi\u1ec7c backup v\u00e0 restore nh\u1edd c\u00e1c c\u00f4ng c\u1ee5 chu\u1ea9n h\u00f3a v\u00e0 giao d\u1ecbch ACID, ph\u00f9 h\u1ee3p cho h\u1ec7 th\u1ed1ng d\u1eef li\u1ec7u t\u1eadp trung.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Trong khi \u0111\u00f3, NoSQL \u01b0u ti\u00ean kh\u1ea3 n\u0103ng x\u1eed l\u00fd d\u1eef li\u1ec7u l\u1edbn v\u00e0 ph\u00e2n t\u00e1n, nh\u01b0ng vi\u1ec7c backup v\u00e0 restore \u0111\u00f2i h\u1ecfi k\u1ef9 thu\u1eadt ph\u1ee9c t\u1ea1p h\u01a1n \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00ednh nh\u1ea5t qu\u00e1n v\u00e0 \u0111\u1ed3ng b\u1ed9. M\u1ed7i h\u1ec7 th\u1ed1ng c\u00f3 \u01b0u v\u00e0 nh\u01b0\u1ee3c \u0111i\u1ec3m ri\u00eang n\u00ean vi\u1ec7c l\u1ef1a ch\u1ecdn h\u1ec7 th\u1ed1ng n\u00e0o c\u1ea7n c\u00e2n nh\u1eafc v\u1ec1 y\u00eau c\u1ea7u v\u1ec1 quy m\u00f4 v\u00e0 t\u00ednh ch\u1ea5t d\u1eef li\u1ec7u.<\/span><\/p>\n<h3><b>Khi n\u00e0o n\u00ean d\u00f9ng caching trong NoSQL?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Caching l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt l\u01b0u tr\u1eef t\u1ea1m th\u1eddi d\u1eef li\u1ec7u trong b\u1ed9 nh\u1edb \u0111\u1ec7m (cache) \u0111\u1ec3 truy c\u1eadp nhanh h\u01a1n khi c\u1ea7n. D\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u01b0u trong cache th\u01b0\u1eddng l\u00e0 c\u00e1c k\u1ebft qu\u1ea3 truy v\u1ea5n ho\u1eb7c n\u1ed9i dung th\u01b0\u1eddng xuy\u00ean \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u, gi\u00fap gi\u1ea3m t\u1ea3i cho h\u1ec7 th\u1ed1ng l\u01b0u tr\u1eef ch\u00ednh ho\u1eb7c c\u01a1 s\u1edf d\u1eef li\u1ec7u. Caching th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c tr\u01b0\u1eddng h\u1ee3p sau:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>H\u1ec7 th\u1ed1ng c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng truy v\u1ea5n cao (High Read Load)<\/b><span style=\"font-weight: 400;\">: Khi h\u1ec7 th\u1ed1ng c\u00f3 nhi\u1ec1u y\u00eau c\u1ea7u \u0111\u1ecdc l\u1eb7p l\u1ea1i t\u1eeb ng\u01b0\u1eddi d\u00f9ng ho\u1eb7c \u1ee9ng d\u1ee5ng, caching gi\u00fap gi\u1ea3m s\u1ed1 l\u01b0\u1ee3ng truy v\u1ea5n tr\u1ef1c ti\u1ebfp \u0111\u1ebfn c\u01a1 s\u1edf d\u1eef li\u1ec7u, gi\u1ea3m t\u1ea3i v\u00e0 c\u1ea3i thi\u1ec7n t\u1ed1c \u0111\u1ed9 ph\u1ea3n h\u1ed3i.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>D\u1eef li\u1ec7u \u00edt thay \u0111\u1ed5i (Static or Semi-static Data)<\/b><span style=\"font-weight: 400;\">: V\u1edbi c\u00e1c lo\u1ea1i d\u1eef li\u1ec7u \u00edt thay \u0111\u1ed5i nh\u01b0 danh s\u00e1ch s\u1ea3n ph\u1ea9m, th\u00f4ng tin ng\u01b0\u1eddi d\u00f9ng ho\u1eb7c c\u1ea5u h\u00ecnh h\u1ec7 th\u1ed1ng, caching \u0111\u1ea3m b\u1ea3o ph\u1ea3n h\u1ed3i nhanh m\u00e0 kh\u00f4ng c\u1ea7n truy v\u1ea5n l\u1ea1i c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>\u1ee8ng d\u1ee5ng y\u00eau c\u1ea7u \u0111\u1ed9 tr\u1ec5 th\u1ea5p (Low-latency Applications)<\/b><span style=\"font-weight: 400;\">: Caching gi\u00fap \u0111\u00e1p \u1ee9ng c\u00e1c \u1ee9ng d\u1ee5ng th\u1eddi gian th\u1ef1c nh\u01b0 m\u1ea1ng x\u00e3 h\u1ed9i, h\u1ec7 th\u1ed1ng g\u1ee3i \u00fd ho\u1eb7c giao d\u1ecbch tr\u1ef1c tuy\u1ebfn c\u1ea7n ph\u1ea3n h\u1ed3i nhanh ch\u00f3ng.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>T\u0103ng hi\u1ec7u su\u1ea5t khi truy c\u1eadp d\u1eef li\u1ec7u ph\u1ee9c t\u1ea1p<\/b><span style=\"font-weight: 400;\">: Khi truy v\u1ea5n y\u00eau c\u1ea7u x\u1eed l\u00fd nhi\u1ec1u t\u00ednh to\u00e1n ho\u1eb7c k\u1ebft h\u1ee3p d\u1eef li\u1ec7u ph\u1ee9c t\u1ea1p, l\u01b0u k\u1ebft qu\u1ea3 truy v\u1ea5n trong cache gi\u00fap tr\u00e1nh th\u1ef1c hi\u1ec7n l\u1ea1i c\u00e1c t\u00e1c v\u1ee5 n\u1eb7ng.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Gi\u1ea3m chi ph\u00ed v\u00e0 t\u1ed1i \u01b0u t\u00e0i nguy\u00ean<\/b><span style=\"font-weight: 400;\">: S\u1eed d\u1ee5ng caching gi\u00fap gi\u1ea3m s\u1ed1 l\u01b0\u1ee3ng truy v\u1ea5n tr\u1ef1c ti\u1ebfp \u0111\u1ebfn c\u01a1 s\u1edf d\u1eef li\u1ec7u, gi\u1ea3m chi ph\u00ed t\u00e0i nguy\u00ean tr\u00ean c\u00e1c m\u00e1y ch\u1ee7 NoSQL, \u0111\u1eb7c bi\u1ec7t trong c\u00e1c h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n ho\u1eb7c cloud-based.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Ph\u00e2n ph\u1ed1i t\u1ea3i trong h\u1ec7 th\u1ed1ng l\u1edbn<\/b><span style=\"font-weight: 400;\">: Trong c\u00e1c h\u1ec7 th\u1ed1ng NoSQL write-heavy, caching cho ph\u00e9p ghi d\u1eef li\u1ec7u v\u00e0o l\u1edbp \u0111\u1ec7m t\u1ea1m th\u1eddi tr\u01b0\u1edbc khi \u0111\u1ed3ng b\u1ed9 v\u00e0o c\u01a1 s\u1edf d\u1eef li\u1ec7u ch\u00ednh, gi\u00fap gi\u1ea3m t\u1ea3i cho m\u00e1y ch\u1ee7 l\u01b0u tr\u1eef.<\/span><\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Cac_cau_hoi_phong_van_NoSQL_ve_bao_mat\"><\/span><b>C\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NoSQL v\u1ec1 b\u1ea3o m\u1eadt<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><b>NoSQL injection l\u00e0 g\u00ec? Gi\u1ea3i th\u00edch v\u1ec1 c\u00e1ch ho\u1ea1t \u0111\u1ed9ng v\u00e0 c\u00e1ch ph\u00f2ng ng\u1eeba<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">T\u01b0\u01a1ng t\u1ef1 v\u1edbi SQL Injection, NoSQL Injection l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt t\u1ea5n c\u00f4ng trong \u0111\u00f3 k\u1ebb x\u00e2m nh\u1eadp ch\u00e8n c\u00e1c \u0111o\u1ea1n m\u00e3 \u0111\u1ed9c h\u1ea1i ho\u1eb7c truy v\u1ea5n kh\u00f4ng mong mu\u1ed1n v\u00e0o h\u1ec7 th\u1ed1ng NoSQL th\u00f4ng qua \u0111\u1ea7u v\u00e0o ng\u01b0\u1eddi d\u00f9ng kh\u00f4ng \u0111\u01b0\u1ee3c ki\u1ec3m so\u00e1t ch\u1eb7t ch\u1ebd. M\u1ee5c ti\u00eau c\u1ee7a NoSQL Injection l\u00e0 truy c\u1eadp, s\u1eeda \u0111\u1ed5i ho\u1eb7c ph\u00e1 h\u1ee7y d\u1eef li\u1ec7u trong c\u01a1 s\u1edf d\u1eef li\u1ec7u NoSQL m\u00e0 kh\u00f4ng c\u1ea7n c\u00f3 quy\u1ec1n h\u1ee3p l\u1ec7.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">NoSQL Injection \u0111\u1eb7c bi\u1ec7t nguy hi\u1ec3m v\u00ec c\u01a1 s\u1edf d\u1eef li\u1ec7u NoSQL th\u01b0\u1eddng kh\u00f4ng c\u00f3 chu\u1ea9n h\u00f3a v\u1ec1 ng\u00f4n ng\u1eef truy v\u1ea5n v\u00e0 c\u00e1c c\u01a1 ch\u1ebf b\u1ea3o v\u1ec7 t\u00edch h\u1ee3p s\u1eb5n th\u01b0\u1eddng kh\u00f4ng \u0111\u1ee7 m\u1ea1nh n\u1ebfu kh\u00f4ng \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp \u0111\u00fang c\u00e1ch.<\/span><\/p>\n<h4><b>C\u00e1ch ho\u1ea1t \u0111\u1ed9ng c\u1ee7a NoSQL Injection<\/b><\/h4>\n<p><span style=\"font-weight: 400;\">NoSQL Injection x\u1ea3y ra khi \u1ee9ng d\u1ee5ng cho ph\u00e9p \u0111\u1ea7u v\u00e0o c\u1ee7a ng\u01b0\u1eddi d\u00f9ng \u0111\u01b0\u1ee3c \u0111\u01b0a tr\u1ef1c ti\u1ebfp v\u00e0o truy v\u1ea5n c\u01a1 s\u1edf d\u1eef li\u1ec7u m\u00e0 kh\u00f4ng \u0111\u01b0\u1ee3c ki\u1ec3m tra ho\u1eb7c x\u1eed l\u00fd \u0111\u00fang c\u00e1ch. C\u00f3 ba h\u00ecnh th\u1ee9c ph\u1ed5 bi\u1ebfn:<\/span><\/p>\n<pre><b>Syntax Injection (Ch\u00e8n c\u00fa ph\u00e1p)<\/b><\/pre>\n<p><span style=\"font-weight: 400;\">K\u1ebb t\u1ea5n c\u00f4ng s\u1ebd ph\u00e1 v\u1ee1 c\u1ea5u tr\u00fac truy v\u1ea5n c\u1ee7a h\u1ec7 th\u1ed1ng b\u1eb1ng c\u00e1ch ch\u00e8n c\u00e1c \u0111i\u1ec1u ki\u1ec7n lu\u00f4n \u0111\u00fang \u0111\u1ec3 l\u1ea5y \u0111\u01b0\u1ee3c d\u1eef li\u1ec7u tr\u00e1i ph\u00e9p ho\u1eb7c \u201cqua m\u1eb7t\u201d (bypass) ph\u1ea7n x\u00e1c th\u1ef1c.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">C\u00e1ch th\u1ee9c hi\u1ec7n: K\u1ebb t\u1ea5n c\u00f4ng s\u1ebd ch\u00e8n v\u00e0o c\u00e1c \u0111i\u1ec1u ki\u1ec7n logic lu\u00f4n \u0111\u00fang nh\u01b0:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">1==1<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">&#8216;a&#8217;==&#8217;a&#8217;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">&#8221;==&#8221;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">true || false<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">V\u00ed d\u1ee5 trong MongoDb: M\u1ed9t \u1ee9ng d\u1ee5ng cho ph\u00e9p ng\u01b0\u1eddi d\u00f9ng \u0111\u0103ng nh\u1eadp b\u1eb1ng c\u00e1ch nh\u1eadp t\u00ean t\u00e0i kho\u1ea3n v\u00e0 m\u1eadt kh\u1ea9u. Khi nh\u1eadn \u0111\u01b0\u1ee3c th\u00f4ng tin, h\u1ec7 th\u1ed1ng t\u1ea1o truy v\u1ea5n:<\/span><\/p>\n<pre><span style=\"font-weight: 400;\">db.users.find({ \"username\": input.username, \"password\": input.password });<\/span><\/pre>\n<p><span style=\"font-weight: 400;\">Trong \u0111\u00f3, <\/span><span style=\"font-weight: 400;\">input.username<\/span><span style=\"font-weight: 400;\"> v\u00e0 <\/span><span style=\"font-weight: 400;\">input.password<\/span><span style=\"font-weight: 400;\"> l\u00e0 d\u1eef li\u1ec7u do ng\u01b0\u1eddi d\u00f9ng nh\u1eadp.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">N\u1ebfu k\u1ebb t\u1ea5n c\u00f4ng nh\u1eadp chu\u1ed7i nh\u01b0 sau v\u00e0o <\/span><span style=\"font-weight: 400;\">input.username<\/span><span style=\"font-weight: 400;\">:<\/span><\/p>\n<pre><span style=\"font-weight: 400;\">{ \"$or\": [ { \"username\": \"admin\" }, { \"1\": { \"$eq\": \"1\" } } ] }<\/span><\/pre>\n<p><span style=\"font-weight: 400;\">Truy v\u1ea5n s\u1ebd tr\u1edf th\u00e0nh:<\/span><\/p>\n<pre><span style=\"font-weight: 400;\">db.users.find({<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0\"username\": {<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\"$or\": [<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{ \"username\": \"admin\" },<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{ \"1\": { \"$eq\": \"1\" } }<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0]<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0},<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\"password\": input.password });<\/span><\/pre>\n<p><span style=\"font-weight: 400;\">Trong truy v\u1ea5n n\u00e0y, \u0111i\u1ec1u ki\u1ec7n <\/span><span style=\"font-weight: 400;\">&#8216;1&#8217;==&#8217;1&#8242;<\/span><span style=\"font-weight: 400;\"> lu\u00f4n \u0111\u00fang, d\u1eabn \u0111\u1ebfn vi\u1ec7c h\u1ec7 th\u1ed1ng tr\u1ea3 v\u1ec1 t\u1ea5t c\u1ea3 t\u00e0i kho\u1ea3n, bao g\u1ed3m c\u1ea3 t\u00e0i kho\u1ea3n qu\u1ea3n tr\u1ecb.<\/span><\/p>\n<h4><b>Operator Injection (Ch\u00e8n to\u00e1n t\u1eed)<\/b><\/h4>\n<p><span style=\"font-weight: 400;\">K\u1ebb t\u1ea5n c\u00f4ng s\u1eed d\u1ee5ng c\u00e1c to\u00e1n t\u1eed \u0111\u1eb7c bi\u1ec7t trong NoSQL \u0111\u1ec3 thao t\u00fang truy v\u1ea5n, thay \u0111\u1ed5i logic ki\u1ec3m tra \u0111\u1ea7u v\u00e0o c\u1ee7a h\u1ec7 th\u1ed1ng.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">C\u00e1ch th\u1ee9c hi\u1ec7n: Thay v\u00ec nh\u1eadp gi\u00e1 tr\u1ecb b\u00ecnh th\u01b0\u1eddng, k\u1ebb t\u1ea5n c\u00f4ng s\u1ebd ch\u00e8n c\u00e1c to\u00e1n t\u1eed nh\u01b0:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">$ne<\/span><span style=\"font-weight: 400;\"> (not equal &#8211; kh\u00e1c v\u1edbi): Tr\u1ea3 v\u1ec1 t\u1ea5t c\u1ea3 c\u00e1c b\u1ea3n ghi kh\u00e1c gi\u00e1 tr\u1ecb \u0111\u01b0\u1ee3c ki\u1ec3m tra.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">$gt<\/span><span style=\"font-weight: 400;\">\/<\/span><span style=\"font-weight: 400;\">$lt<\/span><span style=\"font-weight: 400;\"> (greater than\/less than): So s\u00e1nh v\u1edbi gi\u00e1 tr\u1ecb r\u1ed7ng ho\u1eb7c nh\u1ecf h\u01a1n\/l\u1edbn h\u01a1n m\u1ed9t \u0111i\u1ec1u ki\u1ec7n c\u1ee5 th\u1ec3.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">$regex <\/span><span style=\"font-weight: 400;\">(regular expression &#8211; kh\u1edbp bi\u1ec3u th\u1ee9c ch\u00ednh quy): So kh\u1edbp m\u1ecdi gi\u00e1 tr\u1ecb theo bi\u1ec3u th\u1ee9c ch\u00ednh quy.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">V\u00ed d\u1ee5 v\u1edbi c\u00e2u truy v\u1ea5n tr\u00ean, n\u1ebfu\u00a0 <\/span><span style=\"font-weight: 400;\">input.username<\/span><span style=\"font-weight: 400;\"> ch\u1ee9a:<\/span><\/p>\n<pre><span style=\"font-weight: 400;\">{ \"$ne\": null }<\/span><\/pre>\n<p><span style=\"font-weight: 400;\">V\u00e0 <\/span><span style=\"font-weight: 400;\">input.username<\/span><span style=\"font-weight: 400;\"> ch\u1ee9a:<\/span><\/p>\n<pre><span style=\"font-weight: 400;\">{ \"$regex\": \".*\" }<\/span><\/pre>\n<p><span style=\"font-weight: 400;\">Truy v\u1ea5n s\u1ebd tr\u1edf th\u00e0nh:<\/span><\/p>\n<pre><span style=\"font-weight: 400;\">db.users.find({ \"username\": { \"$ne\": null }, \"password\": { \"$regex\": \".*\" } });<\/span><\/pre>\n<p><span style=\"font-weight: 400;\">Trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y, \u0111i\u1ec1u ki\u1ec7n <\/span><span style=\"font-weight: 400;\">$ne<\/span><span style=\"font-weight: 400;\"> \u0111\u1ea3m b\u1ea3o tr\u1ea3 v\u1ec1 t\u1ea5t c\u1ea3 t\u00e0i kho\u1ea3n c\u00f3 <\/span><span style=\"font-weight: 400;\">username<\/span><span style=\"font-weight: 400;\"> kh\u00f4ng r\u1ed7ng, b\u1ea5t k\u1ec3 <\/span><span style=\"font-weight: 400;\">password<\/span><span style=\"font-weight: 400;\"> l\u00e0 g\u00ec.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">V\u00ed d\u1ee5: N\u1ebfu <\/span><span style=\"font-weight: 400;\">input.password<\/span><span style=\"font-weight: 400;\"> \u0111\u01b0\u1ee3c nh\u1eadp l\u00e0:\u00a0<\/span><\/p>\n<pre><span style=\"font-weight: 400;\">{ \"$gt\": \"\" }<\/span><\/pre>\n<p><span style=\"font-weight: 400;\">Truy v\u1ea5n s\u1ebd tr\u1edf th\u00e0nh:<\/span><\/p>\n<pre><span style=\"font-weight: 400;\">db.users.find({ \"username\": input.username, \"password\": { \"$gt\": \"\" } });<\/span><\/pre>\n<p><span style=\"font-weight: 400;\">C\u00e2u truy v\u1ea5n tr\u00ean c\u00f3 th\u1ec3 tr\u1ea3 v\u1ec1 t\u1ea5t c\u1ea3 c\u00e1c t\u00e0i kho\u1ea3n c\u00f3 m\u1eadt kh\u1ea9u l\u1edbn h\u01a1n chu\u1ed7i r\u1ed7ng, b\u1ecf qua x\u00e1c th\u1ef1c.<\/span><\/p>\n<h4><b>Exploitation via JavaScript Injection (Ti\u00eam m\u00e3 JavaScript)<\/b><\/h4>\n<p><span style=\"font-weight: 400;\">M\u1ed9t s\u1ed1 c\u01a1 s\u1edf d\u1eef li\u1ec7u NoSQL nh\u01b0 MongoDB h\u1ed7 tr\u1ee3 ch\u00e8n m\u00e3 JavaScript v\u00e0o truy v\u1ea5n, k\u1ebb t\u1ea5n c\u00f4ng c\u00f3 th\u1ec3 th\u1ef1c thi m\u00e3 \u0111\u1ed9c tr\u00ean c\u01a1 s\u1edf d\u1eef li\u1ec7u th\u00f4ng qua \u0111\u1ea7u v\u00e0o ng\u01b0\u1eddi d\u00f9ng \u0111\u1ec3 truy xu\u1ea5t d\u1eef li\u1ec7u nh\u1ea1y c\u1ea3m, g\u00e2y gi\u00e1n \u0111o\u1ea1n h\u1ec7 th\u1ed1ng, ho\u1eb7c khai th\u00e1c th\u00eam l\u1ed7 h\u1ed5ng b\u1ea3o m\u1eadt.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">K\u1ebb t\u1ea5n c\u00f4ng th\u01b0\u1eddng d\u00f9ng:<\/span><\/p>\n<ul>\n<li><span style=\"font-weight: 400;\">To\u00e1n t\u1eed <\/span><span style=\"font-weight: 400;\">$where<\/span><span style=\"font-weight: 400;\"> \u0111\u1ec3 ph\u00e9p ch\u00e8n m\u00e3 JavaScript tr\u1ef1c ti\u1ebfp.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">C\u00e1c h\u00e0m JavaScript ph\u1ed5 bi\u1ebfn nh\u01b0 <\/span><span style=\"font-weight: 400;\">startsWith()<\/span><span style=\"font-weight: 400;\">, <\/span><span style=\"font-weight: 400;\">match()<\/span><span style=\"font-weight: 400;\"> ho\u1eb7c v\u00f2ng l\u1eb7p <\/span><span style=\"font-weight: 400;\">for<\/span><span style=\"font-weight: 400;\"> \u0111\u1ec3 t\u1ea1o ra \u0111i\u1ec1u ki\u1ec7n t\u00f9y ch\u1ec9nh nh\u1eb1m d\u00f2 t\u00ecm d\u1eef li\u1ec7u nh\u1ea1y c\u1ea3m.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">V\u00ed d\u1ee5 v\u1edbi c\u00e2u truy v\u1ea5n tr\u00ean, n\u1ebfu k\u1ebb t\u1ea5n c\u00f4ng nh\u1eadp:<\/span><\/p>\n<pre><span style=\"font-weight: 400;\">input = { \"$where\": \"this.password.startsWith('admin')\" };<\/span><\/pre>\n<p><span style=\"font-weight: 400;\">Truy v\u1ea5n s\u1ebd tr\u1edf th\u00e0nh:<\/span><\/p>\n<pre><span style=\"font-weight: 400;\">db.users.find({\u00a0<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\"username\": input.username, \"$where\": \"this.password.startsWith('admin')\"\u00a0<\/span>\r\n\r\n<span style=\"font-weight: 400;\">});<\/span><\/pre>\n<p><span style=\"font-weight: 400;\">Trong \u0111\u00f3:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">M\u00e3 JavaScript <\/span><span style=\"font-weight: 400;\">&#8220;this.password.startsWith(&#8216;admin&#8217;)&#8221;<\/span><span style=\"font-weight: 400;\"> ki\u1ec3m tra t\u1ea5t c\u1ea3 c\u00e1c t\u00e0i kho\u1ea3n c\u00f3 m\u1eadt kh\u1ea9u b\u1eaft \u0111\u1ea7u b\u1eb1ng <\/span><span style=\"font-weight: 400;\">&#8220;admin&#8221;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">K\u1ebb t\u1ea5n c\u00f4ng c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng c\u00e1ch n\u00e0y \u0111\u1ec3 d\u00f2 t\u00ecm m\u1eadt kh\u1ea9u ho\u1eb7c t\u00e0i kho\u1ea3n h\u1ee3p l\u1ec7.<\/span><\/li>\n<\/ul>\n<h4><b>T\u00e1c \u0111\u1ed9ng c\u1ee7a NoSQL Injection<\/b><\/h4>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Truy c\u1eadp tr\u00e1i ph\u00e9p:<\/b><span style=\"font-weight: 400;\"> K\u1ebb t\u1ea5n c\u00f4ng c\u00f3 th\u1ec3 v\u01b0\u1ee3t qua c\u00e1c b\u01b0\u1edbc x\u00e1c th\u1ef1c v\u00e0 \u0111\u0103ng nh\u1eadp v\u00e0o h\u1ec7 th\u1ed1ng m\u00e0 kh\u00f4ng c\u1ea7n th\u00f4ng tin h\u1ee3p l\u1ec7.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>R\u00f2 r\u1ec9 d\u1eef li\u1ec7u:<\/b><span style=\"font-weight: 400;\"> C\u00e1c th\u00f4ng tin nh\u1ea1y c\u1ea3m nh\u01b0 m\u1eadt kh\u1ea9u, th\u00f4ng tin c\u00e1 nh\u00e2n c\u00f3 th\u1ec3 b\u1ecb truy xu\u1ea5t.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Ph\u00e1 h\u1ee7y ho\u1eb7c s\u1eeda \u0111\u1ed5i d\u1eef li\u1ec7u:<\/b><span style=\"font-weight: 400;\"> D\u1eef li\u1ec7u quan tr\u1ecdng c\u00f3 th\u1ec3 b\u1ecb thay \u0111\u1ed5i ho\u1eb7c x\u00f3a, g\u00e2y thi\u1ec7t h\u1ea1i l\u1edbn.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>T\u1ea5n c\u00f4ng t\u1eeb ch\u1ed1i d\u1ecbch v\u1ee5 (DoS):<\/b><span style=\"font-weight: 400;\"> C\u00e1c truy v\u1ea5n \u0111\u1ed9c h\u1ea1i c\u00f3 th\u1ec3 l\u00e0m qu\u00e1 t\u1ea3i c\u01a1 s\u1edf d\u1eef li\u1ec7u, g\u00e2y gi\u00e1n \u0111o\u1ea1n ho\u1ea1t \u0111\u1ed9ng c\u1ee7a h\u1ec7 th\u1ed1ng.<\/span><\/li>\n<\/ul>\n<h3><b>N\u00eau m\u1ed9t s\u1ed1 c\u00e1ch ph\u00f2ng ng\u1eeba NoSQL Injection<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">H\u1eadu qu\u1ea3 c\u1ee7a m\u1ed9t cu\u1ed9c t\u1ea5n c\u00f4ng NoSQL Injection c\u00f3 th\u1ec3 r\u1ea5t nghi\u00eam tr\u1ecdng, bao g\u1ed3m vi\u1ec7c k\u1ebb t\u1ea5n c\u00f4ng truy c\u1eadp tr\u00e1i ph\u00e9p v\u00e0o d\u1eef li\u1ec7u nh\u1ea1y c\u1ea3m, thay \u0111\u1ed5i ho\u1eb7c x\u00f3a d\u1eef li\u1ec7u quan tr\u1ecdng ho\u1eb7c th\u1eadm ch\u00ed l\u00e0m gi\u00e1n \u0111o\u1ea1n to\u00e0n b\u1ed9 h\u1ec7 th\u1ed1ng th\u00f4ng qua c\u00e1c truy v\u1ea5n \u0111\u1ed9c h\u1ea1i. Nh\u1eefng thi\u1ec7t h\u1ea1i n\u00e0y kh\u00f4ng ch\u1ec9 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn uy t\u00edn c\u1ee7a t\u1ed5 ch\u1ee9c m\u00e0 c\u00f2n d\u1eabn \u0111\u1ebfn m\u1ea5t m\u00e1t t\u00e0i ch\u00ednh ho\u1eb7c vi ph\u1ea1m c\u00e1c quy \u0111\u1ecbnh v\u1ec1 b\u1ea3o m\u1eadt d\u1eef li\u1ec7u.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">V\u00ec v\u1eady, \u0111\u1ec3 b\u1ea3o v\u1ec7 h\u1ec7 th\u1ed1ng v\u00e0 gi\u1ea3m thi\u1ec3u r\u1ee7i ro t\u1eeb NoSQL Injection, c\u1ea7n \u00e1p d\u1ee5ng c\u00e1c bi\u1ec7n ph\u00e1p ph\u00f2ng ng\u1eeba m\u1ed9t c\u00e1ch to\u00e0n di\u1ec7n nh\u01b0 sau:<\/span><\/p>\n<ul>\n<li><b>Ki\u1ec3m tra v\u00e0 l\u00e0m s\u1ea1ch d\u1eef li\u1ec7u \u0111\u1ea7u v\u00e0o: <\/b><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng danh s\u00e1ch k\u00fd t\u1ef1 h\u1ee3p l\u1ec7 (allowlist); Lo\u1ea1i b\u1ecf c\u00e1c k\u00fd t\u1ef1 \u0111\u1eb7c bi\u1ec7t nh\u01b0 &#8216;, &#8220;, $, {, }<\/span><\/li>\n<li><b>H\u1ea1n ch\u1ebf s\u1eed d\u1ee5ng c\u00e1c t\u00ednh n\u0103ng nguy hi\u1ec3m:<\/b><span style=\"font-weight: 400;\"> nh\u01b0 c\u00e1c to\u00e1n t\u1eed <\/span><span style=\"font-weight: 400;\">$where<\/span><span style=\"font-weight: 400;\"> ho\u1eb7c <\/span><span style=\"font-weight: 400;\">$regex<\/span><span style=\"font-weight: 400;\"> n\u1ebfu kh\u00f4ng c\u1ea7n thi\u1ebft.<\/span><\/li>\n<li><b>\u1ea8n th\u00f4ng tin l\u1ed7i<\/b><span style=\"font-weight: 400;\">: Kh\u00f4ng hi\u1ec3n th\u1ecb l\u1ed7i chi ti\u1ebft \u0111\u1ec3 tr\u00e1nh b\u1ecb khai th\u00e1c.<\/span><\/li>\n<li><b>Gi\u1edbi h\u1ea1n quy\u1ec1n<\/b><span style=\"font-weight: 400;\">: Ch\u1ec9 c\u1ea5p quy\u1ec1n t\u1ed1i thi\u1ec3u cho t\u00e0i kho\u1ea3n truy v\u1ea5n c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/span><\/li>\n<li><b>Ki\u1ec3m tra v\u00e0 c\u1eadp nh\u1eadt th\u01b0\u1eddng xuy\u00ean<\/b><span style=\"font-weight: 400;\">: b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng c\u00e1c c\u00f4ng c\u1ee5 qu\u00e9t b\u1ea3o m\u1eadt \u0111\u1ec3 ph\u00e1t hi\u1ec7n l\u1ed7 h\u1ed5ng v\u00e0 \u0111\u1ea3m b\u1ea3o c\u01a1 s\u1edf d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt b\u1ea3n v\u00e1 b\u1ea3o m\u1eadt m\u1edbi nh\u1ea5t.<\/span><\/li>\n<\/ul>\n<h3><b>Nh\u1eefng th\u00e1ch th\u1ee9c b\u1ea3o m\u1eadt trong NoSQL l\u00e0 g\u00ec?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">M\u1eb7c d\u00f9 NoSQL \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 x\u1eed l\u00fd d\u1eef li\u1ec7u l\u1edbn v\u00e0 h\u1ed7 tr\u1ee3 h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n hi\u1ec7u qu\u1ea3, n\u00f3 c\u0169ng \u0111\u1ed1i m\u1eb7t v\u1edbi nhi\u1ec1u th\u00e1ch th\u1ee9c b\u1ea3o m\u1eadt do ki\u1ebfn tr\u00fac phi truy\u1ec1n th\u1ed1ng v\u00e0 s\u1ef1 \u0111a d\u1ea1ng trong c\u00e1c lo\u1ea1i c\u01a1 s\u1edf d\u1eef li\u1ec7u. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 nh\u1eefng th\u00e1ch th\u1ee9c b\u1ea3o m\u1eadt ph\u1ed5 bi\u1ebfn trong NoSQL:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Thi\u1ebfu ki\u1ec3m so\u00e1t truy c\u1eadp ch\u1eb7t ch\u1ebd<\/b><span style=\"font-weight: 400;\">: M\u1ed9t s\u1ed1 c\u01a1 s\u1edf d\u1eef li\u1ec7u NoSQL kh\u00f4ng c\u00f3 ho\u1eb7c ch\u1ec9 cung c\u1ea5p c\u00e1c c\u01a1 ch\u1ebf ki\u1ec3m so\u00e1t truy c\u1eadp c\u01a1 b\u1ea3n, nh\u01b0 x\u00e1c th\u1ef1c ng\u01b0\u1eddi d\u00f9ng v\u00e0 ph\u00e2n quy\u1ec1n, d\u1eabn \u0111\u1ebfn vi\u1ec7c d\u1eef li\u1ec7u b\u1ecb truy c\u1eadp tr\u00e1i ph\u00e9p.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>M\u00e3 h\u00f3a d\u1eef li\u1ec7u kh\u00f4ng \u0111\u1ea7y \u0111\u1ee7<\/b><span style=\"font-weight: 400;\">: Nhi\u1ec1u h\u1ec7 th\u1ed1ng NoSQL kh\u00f4ng m\u1eb7c \u0111\u1ecbnh h\u1ed7 tr\u1ee3 m\u00e3 h\u00f3a d\u1eef li\u1ec7u khi l\u01b0u tr\u1eef (encryption at rest) ho\u1eb7c khi truy\u1ec1n qua m\u1ea1ng (encryption in transit), l\u00e0m t\u0103ng r\u1ee7i ro r\u00f2 r\u1ec9 d\u1eef li\u1ec7u n\u1ebfu h\u1ec7 th\u1ed1ng b\u1ecb t\u1ea5n c\u00f4ng.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>T\u00ednh nh\u1ea5t qu\u00e1n v\u00e0 kh\u1ea3 n\u0103ng ch\u1ecbu l\u1ed7i<\/b><span style=\"font-weight: 400;\">: C\u00e1c c\u01a1 ch\u1ebf nh\u01b0 eventual consistency c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn t\u00ecnh tr\u1ea1ng d\u1eef li\u1ec7u t\u1ea1m th\u1eddi kh\u00f4ng \u0111\u1ed3ng b\u1ed9, l\u00e0m t\u0103ng nguy c\u01a1 t\u1ea5n c\u00f4ng v\u00e0o c\u00e1c \u0111i\u1ec3m y\u1ebfu trong qu\u00e1 tr\u00ecnh \u0111\u1ed3ng b\u1ed9 h\u00f3a d\u1eef li\u1ec7u.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>T\u1ea5n c\u00f4ng injection<\/b><span style=\"font-weight: 400;\">: Gi\u1ed1ng nh\u01b0 SQL injection, NoSQL c\u0169ng d\u1ec5 b\u1ecb NoSQL injection, trong \u0111\u00f3 k\u1ebb t\u1ea5n c\u00f4ng ch\u00e8n c\u00e1c \u0111o\u1ea1n m\u00e3 \u0111\u1ed9c v\u00e0o truy v\u1ea5n \u0111\u1ec3 truy c\u1eadp ho\u1eb7c thay \u0111\u1ed5i d\u1eef li\u1ec7u tr\u00e1i ph\u00e9p.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Thi\u1ebfu nh\u1eadt k\u00fd (logging) v\u00e0 gi\u00e1m s\u00e1t b\u1ea3o m\u1eadt<\/b><span style=\"font-weight: 400;\">: M\u1ed9t s\u1ed1 h\u1ec7 th\u1ed1ng NoSQL kh\u00f4ng h\u1ed7 tr\u1ee3 \u0111\u1ea7y \u0111\u1ee7 t\u00ednh n\u0103ng ghi nh\u1eadt k\u00fd ho\u1eb7c gi\u00e1m s\u00e1t c\u00e1c ho\u1ea1t \u0111\u1ed9ng truy c\u1eadp, khi\u1ebfn vi\u1ec7c ph\u00e1t hi\u1ec7n v\u00e0 \u1ee9ng ph\u00f3 v\u1edbi s\u1ef1 c\u1ed1 b\u1ea3o m\u1eadt kh\u00f3 kh\u0103n h\u01a1n.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>C\u00e1c bi\u1ec7n ph\u00e1p tri\u1ec3n khai ph\u1ee9c t\u1ea1p<\/b><span style=\"font-weight: 400;\">: Do d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c ph\u00e2n t\u00e1n tr\u00ean nhi\u1ec1u n\u00fat ho\u1eb7c shard, vi\u1ec7c \u0111\u1ea3m b\u1ea3o b\u1ea3o m\u1eadt nh\u1ea5t qu\u00e1n tr\u00ean to\u00e0n b\u1ed9 h\u1ec7 th\u1ed1ng tr\u1edf n\u00ean ph\u1ee9c t\u1ea1p h\u01a1n, \u0111\u1eb7c bi\u1ec7t khi sao l\u01b0u ho\u1eb7c di chuy\u1ec3n d\u1eef li\u1ec7u.<\/span><\/li>\n<\/ul>\n<h3><b>Vai tr\u00f2 c\u1ee7a ACL (Access Control List) trong NoSQL?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">ACL (Access Control List) l\u00e0 m\u1ed9t danh s\u00e1ch c\u00e1c quy t\u1eafc \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 ki\u1ec3m so\u00e1t quy\u1ec1n truy c\u1eadp v\u00e0o t\u00e0i nguy\u00ean trong m\u1ed9t h\u1ec7 th\u1ed1ng, ch\u1eb3ng h\u1ea1n nh\u01b0 c\u01a1 s\u1edf d\u1eef li\u1ec7u, t\u1ec7p tin ho\u1eb7c \u1ee9ng d\u1ee5ng. M\u1ed7i m\u1ee5c trong danh s\u00e1ch (entry) x\u00e1c \u0111\u1ecbnh:<\/span><\/p>\n<ol>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Ai<\/b><span style=\"font-weight: 400;\"> c\u00f3 quy\u1ec1n truy c\u1eadp (v\u00ed d\u1ee5: ng\u01b0\u1eddi d\u00f9ng, nh\u00f3m ng\u01b0\u1eddi d\u00f9ng ho\u1eb7c vai tr\u00f2).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>H\u00e0nh \u0111\u1ed9ng n\u00e0o<\/b><span style=\"font-weight: 400;\"> \u0111\u01b0\u1ee3c ph\u00e9p th\u1ef1c hi\u1ec7n tr\u00ean t\u00e0i nguy\u00ean (v\u00ed d\u1ee5: \u0111\u1ecdc, ghi, s\u1eeda, x\u00f3a).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>T\u00e0i nguy\u00ean<\/b><span style=\"font-weight: 400;\"> \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng quy t\u1eafc (v\u00ed d\u1ee5: m\u1ed9t t\u1ec7p tin c\u1ee5 th\u1ec3, b\u1ea3ng d\u1eef li\u1ec7u ho\u1eb7c URL).<\/span><\/li>\n<\/ol>\n<p><span style=\"font-weight: 400;\">Khi l\u00e0m vi\u1ec7c v\u1edbi c\u01a1 s\u1edf d\u1eef li\u1ec7u NoSQL, \u0111\u1eb7c bi\u1ec7t trong c\u00e1c d\u1ef1 \u00e1n y\u00eau c\u1ea7u qu\u1ea3n l\u00fd d\u1eef li\u1ec7u ng\u01b0\u1eddi d\u00f9ng nh\u1ea1y c\u1ea3m, k\u1ef9 n\u0103ng thi\u1ebft l\u1eadp ACL (Access Control List) l\u00e0 m\u1ed9t trong nh\u1eefng y\u1ebfu t\u1ed1 c\u1ed1t l\u00f5i \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o b\u1ea3o m\u1eadt.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">ACL gi\u00fap ki\u1ec3m so\u00e1t quy\u1ec1n truy c\u1eadp v\u00e0o t\u00e0i nguy\u00ean d\u1eef li\u1ec7u, \u0111\u1ea3m b\u1ea3o r\u1eb1ng ch\u1ec9 nh\u1eefng ng\u01b0\u1eddi ho\u1eb7c h\u1ec7 th\u1ed1ng \u0111\u01b0\u1ee3c \u1ee7y quy\u1ec1n m\u1edbi c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n c\u00e1c thao t\u00e1c tr\u00ean d\u1eef li\u1ec7u.<\/span><\/p>\n<h4><b>Vai tr\u00f2 c\u1ee7a ACL trong b\u1ea3o m\u1eadt NoSQL<\/b><\/h4>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Ki\u1ec3m so\u00e1t truy c\u1eadp linh ho\u1ea1t: <\/b><span style=\"font-weight: 400;\">V\u1edbi NoSQL, d\u1eef li\u1ec7u th\u01b0\u1eddng kh\u00f4ng c\u00f3 c\u1ea5u tr\u00fac ch\u1eb7t ch\u1ebd nh\u01b0 SQL, do \u0111\u00f3 ACL c\u1ea7n \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf linh ho\u1ea1t \u0111\u1ec3 ph\u00f9 h\u1ee3p v\u1edbi t\u1eebng t\u00e0i nguy\u00ean (collections, documents, etc.).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Ph\u00e2n quy\u1ec1n d\u1ef1a tr\u00ean vai tr\u00f2: <\/b><span style=\"font-weight: 400;\">ACL trong NoSQL th\u01b0\u1eddng \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp d\u1ef1a tr\u00ean c\u00e1c vai tr\u00f2 (roles) nh\u01b0 Admin, User, ho\u1eb7c Service. \u0110i\u1ec1u n\u00e0y \u0111\u1ea3m b\u1ea3o m\u1ed7i nh\u00f3m ch\u1ec9 c\u00f3 quy\u1ec1n truy c\u1eadp c\u1ea7n thi\u1ebft, gi\u1ea3m thi\u1ec3u nguy c\u01a1 b\u1ecb l\u1ea1m d\u1ee5ng.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>T\u0103ng c\u01b0\u1eddng b\u1ea3o m\u1eadt<\/b><span style=\"font-weight: 400;\">: ACL gi\u00fap gi\u1ea3m thi\u1ec3u quy\u1ec1n kh\u00f4ng c\u1ea7n thi\u1ebft, h\u1ea1n ch\u1ebf quy\u1ec1n ghi ho\u1eb7c x\u00f3a d\u1eef li\u1ec7u \u1edf c\u00e1c c\u1ea5p truy c\u1eadp kh\u00f4ng ph\u00f9 h\u1ee3p, b\u1ea3o v\u1ec7 h\u1ec7 th\u1ed1ng tr\u01b0\u1edbc c\u00e1c t\u1ea5n c\u00f4ng nh\u01b0 NoSQL Injection.<\/span><\/li>\n<\/ul>\n<h4><b>K\u1ef9 n\u0103ng c\u1ea7n c\u00f3 khi thi\u1ebft l\u1eadp ACL trong NoSQL<\/b><\/h4>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Hi\u1ec3u c\u1ea5u tr\u00fac NoSQL: <\/b><span style=\"font-weight: 400;\">Ph\u00e2n bi\u1ec7t gi\u1eefa c\u00e1c lo\u1ea1i c\u01a1 s\u1edf d\u1eef li\u1ec7u NoSQL nh\u01b0 MongoDB, Firebase, CouchDB v\u00e0 c\u00e1ch ACL \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef ho\u1eb7c t\u00edch h\u1ee3p trong t\u1eebng lo\u1ea1i.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>S\u1eed d\u1ee5ng c\u00f4ng c\u1ee5 b\u1ea3o m\u1eadt n\u1ed9i b\u1ed9: <\/b><span style=\"font-weight: 400;\">M\u1ed9t s\u1ed1 NoSQL (nh\u01b0 MongoDB Atlas ho\u1eb7c Firebase) cung c\u1ea5p s\u1eb5n c\u00f4ng c\u1ee5 ACL \u0111\u1ec3 thi\u1ebft l\u1eadp quy\u1ec1n. Bi\u1ebft c\u00e1ch s\u1eed d\u1ee5ng ch\u00fang l\u00e0 m\u1ed9t k\u1ef9 n\u0103ng quan tr\u1ecdng.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>X\u00e2y d\u1ef1ng logic ki\u1ec3m tra quy\u1ec1n: <\/b><span style=\"font-weight: 400;\">Trong c\u00e1c h\u1ec7 th\u1ed1ng kh\u00f4ng c\u00f3 h\u1ed7 tr\u1ee3 ACL t\u00edch h\u1ee3p, l\u1eadp tr\u00ecnh vi\u00ean c\u1ea7n thi\u1ebft k\u1ebf logic ki\u1ec3m tra quy\u1ec1n th\u1ee7 c\u00f4ng trong \u1ee9ng d\u1ee5ng. V\u00e0 vi\u1ec7c n\u00e0y \u0111\u00f2i h\u1ecfi k\u1ef9 n\u0103ng l\u1eadp tr\u00ecnh v\u00e0 qu\u1ea3n l\u00fd c\u1ea5u tr\u00fac d\u1eef li\u1ec7u ACL.<\/span><\/li>\n<\/ul>\n<h3><b>T\u00ednh n\u0103ng h\u1ed7 tr\u1ee3 m\u00e3 ho\u00e1 d\u1eef li\u1ec7u trong NoSQL<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">H\u1ea7u h\u1ebft c\u00e1c h\u1ec7 qu\u1ea3n tr\u1ecb c\u01a1 s\u1edf d\u1eef li\u1ec7u NoSQL hi\u1ec7n \u0111\u1ea1i \u0111\u1ec1u h\u1ed7 tr\u1ee3 m\u00e3 h\u00f3a d\u1eef li\u1ec7u nh\u1eb1m \u0111\u1ea3m b\u1ea3o t\u00ednh b\u1ea3o m\u1eadt, \u0111\u1eb7c bi\u1ec7t trong c\u00e1c h\u1ec7 th\u1ed1ng y\u00eau c\u1ea7u l\u01b0u tr\u1eef th\u00f4ng tin nh\u1ea1y c\u1ea3m. M\u00e3 h\u00f3a d\u1eef li\u1ec7u trong NoSQL th\u01b0\u1eddng \u0111\u01b0\u1ee3c tri\u1ec3n khai \u1edf hai c\u1ea5p \u0111\u1ed9 ch\u00ednh:<\/span><\/p>\n<h4><b>M\u00e3 h\u00f3a d\u1eef li\u1ec7u khi l\u01b0u tr\u1eef (Encryption at Rest)<\/b><\/h4>\n<p><span style=\"font-weight: 400;\">D\u1eef li\u1ec7u \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a khi l\u01b0u trong \u0111\u0129a c\u1ee9ng ho\u1eb7c c\u00e1c m\u00f4i tr\u01b0\u1eddng l\u01b0u tr\u1eef nh\u01b0 SSD v\u00e0 HDD.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">M\u1ed9t s\u1ed1 h\u1ec7 qu\u1ea3n tr\u1ecb NoSQL c\u00f3 t\u00ednh n\u0103ng n\u00e0y g\u1ed3m:<\/span><\/li>\n<\/ul>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>MongoDB:<\/b><span style=\"font-weight: 400;\"> H\u1ed7 tr\u1ee3 m\u00e3 h\u00f3a d\u1eef li\u1ec7u t\u1ea1i ch\u1ed7 b\u1eb1ng Encrypted Storage Engine. Ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 b\u1eadt m\u00e3 h\u00f3a t\u1ea1i t\u1ea7ng l\u01b0u tr\u1eef th\u00f4ng qua c\u00e1c kh\u00f3a m\u00e3 h\u00f3a \u0111\u01b0\u1ee3c qu\u1ea3n l\u00fd b\u1edfi h\u1ec7 th\u1ed1ng qu\u1ea3n l\u00fd kh\u00f3a (KMS) nh\u01b0 AWS KMS, Azure Key Vault ho\u1eb7c GCP KMS.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Cassandra:<\/b><span style=\"font-weight: 400;\"> H\u1ed7 tr\u1ee3 m\u00e3 h\u00f3a d\u1eef li\u1ec7u t\u1ea1i rest b\u1eb1ng c\u00e1ch c\u1ea5u h\u00ecnh c\u00e1c encryption providers.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Firebase:<\/b><span style=\"font-weight: 400;\"> Google Cloud Firestore m\u00e3 h\u00f3a to\u00e0n b\u1ed9 d\u1eef li\u1ec7u l\u01b0u tr\u1eef b\u1eb1ng c\u00e1c ti\u00eau chu\u1ea9n AES-256.<\/span><\/li>\n<\/ul>\n<h4><b>M\u00e3 h\u00f3a d\u1eef li\u1ec7u khi truy\u1ec1n t\u1ea3i (Encryption in Transit)<\/b><\/h4>\n<p><span style=\"font-weight: 400;\">D\u1eef li\u1ec7u \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a khi truy\u1ec1n qua m\u1ea1ng, \u0111\u1ea3m b\u1ea3o kh\u00f4ng b\u1ecb \u0111\u1ecdc l\u00e9n ho\u1eb7c ch\u1ec9nh s\u1eeda trong qu\u00e1 tr\u00ecnh truy\u1ec1n t\u1ea3i.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">C\u00e1c h\u1ec7 qu\u1ea3n tr\u1ecb NoSQL nh\u01b0 MongoDB, CouchDB v\u00e0 Cassandra \u0111\u1ec1u h\u1ed7 tr\u1ee3 k\u1ebft n\u1ed1i m\u00e3 h\u00f3a th\u00f4ng qua giao th\u1ee9c TLS\/SSL (Transport Layer Security\/Secure Sockets Layer).<\/span><\/li>\n<\/ul>\n<h3><b>M\u1ed9t s\u1ed1 l\u01b0u \u00fd v\u1ec1 m\u00e3 h\u00f3a trong NoSQL<\/b><\/h3>\n<p><b>M\u00e3 h\u00f3a c\u00f3 th\u1ec3 l\u00e0m gi\u1ea3m t\u1ed1c \u0111\u1ed9 h\u1ec7 th\u1ed1ng<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Khi k\u00edch ho\u1ea1t m\u00e3 h\u00f3a, c\u01a1 s\u1edf d\u1eef li\u1ec7u ph\u1ea3i th\u1ef1c hi\u1ec7n th\u00eam c\u00e1c thao t\u00e1c m\u00e3 h\u00f3a (encrypt) v\u00e0 gi\u1ea3i m\u00e3 (decrypt) d\u1eef li\u1ec7u m\u1ed7i khi l\u01b0u tr\u1eef ho\u1eb7c truy xu\u1ea5t d\u1eabn \u0111\u1ebfn ti\u00eau t\u1ed1n t\u00e0i nguy\u00ean CPU v\u00e0 l\u00e0m t\u0103ng \u0111\u1ed9 tr\u1ec5 x\u1eed l\u00fd, \u0111\u1eb7c bi\u1ec7t v\u1edbi c\u00e1c h\u1ec7 th\u1ed1ng x\u1eed l\u00fd kh\u1ed1i l\u01b0\u1ee3ng l\u1edbn d\u1eef li\u1ec7u ho\u1eb7c y\u00eau c\u1ea7u t\u1ed1c \u0111\u1ed9 cao.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">V\u00ed d\u1ee5, khi th\u1ef1c hi\u1ec7n c\u00e1c truy v\u1ea5n ph\u1ee9c t\u1ea1p tr\u00ean d\u1eef li\u1ec7u \u0111\u00e3 m\u00e3 h\u00f3a, th\u1eddi gian x\u1eed l\u00fd c\u00f3 th\u1ec3 t\u0103ng l\u00ean \u0111\u00e1ng k\u1ec3. V\u00ec v\u1eady, tr\u01b0\u1edbc khi \u00e1p d\u1ee5ng m\u00e3 h\u00f3a to\u00e0n di\u1ec7n, l\u1eadp tr\u00ecnh vi\u00ean c\u1ea7n ki\u1ec3m tra v\u00e0 \u0111\u00e1nh gi\u00e1 hi\u1ec7u su\u1ea5t h\u1ec7 th\u1ed1ng, \u0111\u1ea3m b\u1ea3o r\u1eb1ng vi\u1ec7c m\u00e3 h\u00f3a kh\u00f4ng g\u00e2y \u1ea3nh h\u01b0\u1edfng qu\u00e1 l\u1edbn \u0111\u1ebfn tr\u1ea3i nghi\u1ec7m ng\u01b0\u1eddi d\u00f9ng ho\u1eb7c ho\u1ea1t \u0111\u1ed9ng c\u1ee7a h\u1ec7 th\u1ed1ng.<\/span><\/p>\n<p><b>Kh\u00f3a m\u00e3 h\u00f3a c\u1ea7n \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 an to\u00e0n<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Kh\u00f3a m\u00e3 h\u00f3a l\u00e0 y\u1ebfu t\u1ed1 quan tr\u1ecdng nh\u1ea5t trong c\u01a1 ch\u1ebf m\u00e3 h\u00f3a d\u1eef li\u1ec7u, v\u00ec n\u00f3 ch\u00ednh l\u00e0 ch\u00eca kh\u00f3a \u0111\u1ec3 gi\u1ea3i m\u00e3 d\u1eef li\u1ec7u. N\u1ebfu kh\u00f3a n\u00e0y b\u1ecb l\u1ed9 ho\u1eb7c b\u1ecb \u0111\u00e1nh c\u1eafp, to\u00e0n b\u1ed9 d\u1eef li\u1ec7u m\u00e3 h\u00f3a c\u00f3 th\u1ec3 b\u1ecb gi\u1ea3i m\u00e3 v\u00e0 r\u00f2 r\u1ec9. Do \u0111\u00f3, vi\u1ec7c b\u1ea3o v\u1ec7 kh\u00f3a m\u00e3 h\u00f3a c\u1ea7n \u0111\u01b0\u1ee3c \u01b0u ti\u00ean h\u00e0ng \u0111\u1ea7u.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">M\u1ed9t s\u1ed1 d\u1ecbch v\u1ee5 qu\u1ea3n l\u00fd kho\u00e1 chuy\u00ean d\u1ee5ng m\u00e0 l\u1eadp tr\u00ecnh vi\u00ean c\u00f3 th\u1ec3 c\u00e2n nh\u1eafc s\u1eed d\u1ee5ng \u0111\u1ec3 l\u01b0u tr\u1eef v\u00e0 qu\u1ea3n l\u00fd kho\u00e1 m\u1ed9t c\u00e1ch an to\u00e0n l\u00e0 AWS KMS, Azure Key Vault ho\u1eb7c Google Cloud KMS. \u0110\u1ed3ng th\u1eddi, h\u1ea1n ch\u1ebf quy\u1ec1n truy c\u1eadp v\u00e0o kh\u00f3a m\u00e3 h\u00f3a, ch\u1ec9 cho ph\u00e9p c\u00e1c d\u1ecbch v\u1ee5 ho\u1eb7c ng\u01b0\u1eddi d\u00f9ng th\u1ef1c s\u1ef1 c\u1ea7n thi\u1ebft s\u1eed d\u1ee5ng kh\u00f3a.<\/span><\/p>\n<p><b>M\u1ee9c \u0111\u1ed9 m\u00e3 h\u00f3a kh\u00e1c nhau t\u00f9y v\u00e0o nhu c\u1ea7u<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Kh\u00f4ng ph\u1ea3i t\u1ea5t c\u1ea3 d\u1eef li\u1ec7u trong c\u01a1 s\u1edf d\u1eef li\u1ec7u \u0111\u1ec1u c\u1ea7n \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a. D\u1eef li\u1ec7u nh\u1ea1y c\u1ea3m nh\u01b0 m\u1eadt kh\u1ea9u, s\u1ed1 th\u1ebb t\u00edn d\u1ee5ng ho\u1eb7c th\u00f4ng tin c\u00e1 nh\u00e2n c\u1ea7n \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a m\u1ea1nh \u0111\u1ec3 b\u1ea3o v\u1ec7 kh\u1ecfi truy c\u1eadp tr\u00e1i ph\u00e9p. Tuy nhi\u00ean, c\u00e1c d\u1eef li\u1ec7u \u00edt quan tr\u1ecdng h\u01a1n nh\u01b0 t\u00ean s\u1ea3n ph\u1ea9m, m\u00f4 t\u1ea3 ho\u1eb7c th\u00f4ng tin c\u00f4ng khai c\u00f3 th\u1ec3 kh\u00f4ng c\u1ea7n m\u00e3 h\u00f3a \u0111\u1ec3 ti\u1ebft ki\u1ec7m t\u00e0i nguy\u00ean v\u00e0 t\u1ed1i \u01b0u hi\u1ec7u su\u1ea5t.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">M\u1ed9t s\u1ed1 h\u1ec7 qu\u1ea3n tr\u1ecb NoSQL nh\u01b0 MongoDB, cung c\u1ea5p t\u00ednh n\u0103ng m\u00e3 h\u00f3a t\u1eebng tr\u01b0\u1eddng (field-level encryption), cho ph\u00e9p l\u1eadp tr\u00ecnh vi\u00ean ch\u1ec9 m\u00e3 h\u00f3a nh\u1eefng tr\u01b0\u1eddng d\u1eef li\u1ec7u quan tr\u1ecdng, tr\u00e1nh l\u00e3ng ph\u00ed t\u00e0i nguy\u00ean kh\u00f4ng c\u1ea7n thi\u1ebft.<\/span><\/p>\n<p><b>Kh\u00f4ng n\u00ean ph\u1ee5 thu\u1ed9c ho\u00e0n to\u00e0n v\u00e0o m\u00e3 h\u00f3a<\/b><\/p>\n<p><span style=\"font-weight: 400;\">M\u00e3 h\u00f3a l\u00e0 m\u1ed9t l\u1edbp b\u1ea3o m\u1eadt m\u1ea1nh m\u1ebd, nh\u01b0ng n\u00f3 kh\u00f4ng th\u1ec3 thay th\u1ebf cho c\u00e1c bi\u1ec7n ph\u00e1p b\u1ea3o m\u1eadt kh\u00e1c. N\u1ebfu h\u1ec7 th\u1ed1ng kh\u00f4ng c\u00f3 c\u01a1 ch\u1ebf ki\u1ec3m tra quy\u1ec1n truy c\u1eadp (ACL) ho\u1eb7c x\u00e1c th\u1ef1c ng\u01b0\u1eddi d\u00f9ng m\u1ea1nh (strong authentication), k\u1ebb t\u1ea5n c\u00f4ng v\u1eabn c\u00f3 th\u1ec3 truy c\u1eadp v\u00e0o d\u1eef li\u1ec7u d\u00f9 \u0111\u00e3 \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">V\u00ed d\u1ee5, n\u1ebfu \u1ee9ng d\u1ee5ng b\u1ecb t\u1ea5n c\u00f4ng b\u1eb1ng NoSQL Injection, m\u00e3 h\u00f3a c\u00f3 th\u1ec3 kh\u00f4ng ng\u0103n ch\u1eb7n \u0111\u01b0\u1ee3c k\u1ebb t\u1ea5n c\u00f4ng truy c\u1eadp v\u00e0o d\u1eef li\u1ec7u tr\u01b0\u1edbc khi n\u00f3 \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">V\u00ec v\u1eady, m\u00e3 h\u00f3a n\u00ean \u0111\u01b0\u1ee3c k\u1ebft h\u1ee3p v\u1edbi c\u00e1c l\u1edbp b\u1ea3o m\u1eadt kh\u00e1c nh\u01b0 x\u00e1c th\u1ef1c ng\u01b0\u1eddi d\u00f9ng, ph\u00e2n quy\u1ec1n v\u00e0 ki\u1ec3m tra nh\u1eadt k\u00fd truy c\u1eadp \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o to\u00e0n di\u1ec7n.<\/span><\/p>\n<p><b>Ch\u1ecdn c\u00f4ng ngh\u1ec7 m\u00e3 h\u00f3a hi\u1ec7n \u0111\u1ea1i<\/b><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u1ec3 \u0111\u1ea3m b\u1ea3o d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 hi\u1ec7u qu\u1ea3, b\u1ea1n n\u00ean s\u1eed d\u1ee5ng c\u00e1c thu\u1eadt to\u00e1n m\u00e3 h\u00f3a m\u1ea1nh m\u1ebd v\u00e0 \u0111\u01b0\u1ee3c ti\u00eau chu\u1ea9n h\u00f3a. Tr\u00e1nh s\u1eed d\u1ee5ng c\u00e1c thu\u1eadt to\u00e1n c\u0169 ho\u1eb7c \u0111\u00e3 l\u1ed7i th\u1eddi nh\u01b0 DES ho\u1eb7c RC4, v\u00ec ch\u00fang c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng b\u1ecb t\u1ea5n c\u00f4ng b\u1eb1ng c\u00e1c c\u00f4ng c\u1ee5 hi\u1ec7n \u0111\u1ea1i.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Ngo\u00e0i ra, b\u1ea1n c\u1ea7n \u0111\u1ea3m b\u1ea3o r\u1eb1ng h\u1ec7 th\u1ed1ng lu\u00f4n \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt \u0111\u1ec3 t\u1eadn d\u1ee5ng c\u00e1c c\u1ea3i ti\u1ebfn m\u1edbi nh\u1ea5t trong c\u00f4ng ngh\u1ec7 m\u00e3 h\u00f3a v\u00e0 b\u1ea3o m\u1eadt.<\/span><\/p>\n<h3><b>Ph\u00e2n bi\u1ec7t gi\u1eefa x\u00e1c th\u1ef1c m\u00e1y kh\u00e1ch v\u00e0 ng\u01b0\u1eddi d\u00f9ng trong MongoDB<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Trong MongoDB, x\u00e1c th\u1ef1c m\u00e1y kh\u00e1ch (client authentication) v\u00e0 x\u00e1c th\u1ef1c ng\u01b0\u1eddi d\u00f9ng (user authentication) l\u00e0 hai c\u01a1 ch\u1ebf quan tr\u1ecdng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 b\u1ea3o v\u1ec7 h\u1ec7 th\u1ed1ng, nh\u01b0ng ch\u00fang ph\u1ee5c v\u1ee5 c\u00e1c m\u1ee5c \u0111\u00edch v\u00e0 c\u1ea5p \u0111\u1ed9 b\u1ea3o m\u1eadt kh\u00e1c nhau.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>X\u00e1c th\u1ef1c m\u00e1y kh\u00e1ch (Client Authentication):<\/b><span style=\"font-weight: 400;\"> l\u00e0 qu\u00e1 tr\u00ecnh ki\u1ec3m tra danh t\u00ednh c\u1ee7a m\u1ed9t \u1ee9ng d\u1ee5ng ho\u1eb7c h\u1ec7 th\u1ed1ng \u0111ang c\u1ed1 g\u1eafng k\u1ebft n\u1ed1i v\u1edbi MongoDB. Qu\u00e1 tr\u00ecnh n\u00e0y th\u01b0\u1eddng x\u1ea3y ra \u1edf c\u1ea5p \u0111\u1ed9 m\u1ea1ng ho\u1eb7c giao th\u1ee9c tr\u01b0\u1edbc khi b\u1ea5t k\u1ef3 truy v\u1ea5n n\u00e0o \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n tr\u00ean c\u01a1 s\u1edf d\u1eef li\u1ec7u.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>X\u00e1c th\u1ef1c ng\u01b0\u1eddi d\u00f9ng (User Authentication): <\/b><span style=\"font-weight: 400;\">X\u00e1c th\u1ef1c ng\u01b0\u1eddi d\u00f9ng ho\u1ea1t \u0111\u1ed9ng b\u00ean trong MongoDB, t\u1eadp trung v\u00e0o qu\u1ea3n l\u00fd quy\u1ec1n truy c\u1eadp d\u1eef li\u1ec7u. Sau khi m\u1ed9t k\u1ebft n\u1ed1i \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp, m\u1ed7i ng\u01b0\u1eddi d\u00f9ng c\u1ea7n \u0111\u01b0\u1ee3c x\u00e1c th\u1ef1c b\u1eb1ng t\u00ean, m\u1eadt kh\u1ea9u v\u00e0 c\u00e1c thao t\u00e1c c\u1ee7a h\u1ecd s\u1ebd b\u1ecb gi\u1edbi h\u1ea1n d\u1ef1a tr\u00ean vai tr\u00f2 (role).<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">M\u1ed9t s\u1ed1 kh\u00e1c bi\u1ec7t ch\u00ednh gi\u1eefa x\u00e1c th\u1ef1c m\u00e1y kh\u00e1ch v\u00e0 ng\u01b0\u1eddi d\u00f9ng trong MongoDB:<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><b>Ti\u00eau ch\u00ed<\/b><\/td>\n<td><b>X\u00e1c th\u1ef1c m\u00e1y kh\u00e1ch<\/b><\/td>\n<td><b>X\u00e1c th\u1ef1c ng\u01b0\u1eddi d\u00f9ng<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">\u0110\u1ed1i t\u01b0\u1ee3ng x\u00e1c th\u1ef1c<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u1ee8ng d\u1ee5ng, m\u00e1y ch\u1ee7 ho\u1eb7c h\u1ec7 th\u1ed1ng mu\u1ed1n k\u1ebft n\u1ed1i t\u1edbi MongoDB.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Ng\u01b0\u1eddi d\u00f9ng ho\u1eb7c t\u00e0i kho\u1ea3n c\u1ed1 g\u1eafng th\u1ef1c hi\u1ec7n c\u00e1c thao t\u00e1c tr\u00ean c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">M\u1ee5c \u0111\u00edch ch\u00ednh<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u0110\u1ea3m b\u1ea3o r\u1eb1ng ch\u1ec9 c\u00e1c \u1ee9ng d\u1ee5ng ho\u1eb7c m\u00e1y ch\u1ee7 \u0111\u01b0\u1ee3c \u1ee7y quy\u1ec1n m\u1edbi \u0111\u01b0\u1ee3c ph\u00e9p k\u1ebft n\u1ed1i v\u1edbi MongoDB.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">\u0110\u1ea3m b\u1ea3o r\u1eb1ng ch\u1ec9 nh\u1eefng ng\u01b0\u1eddi d\u00f9ng h\u1ee3p l\u1ec7 m\u1edbi c\u00f3 th\u1ec3 truy c\u1eadp v\u00e0 thao t\u00e1c tr\u00ean t\u00e0i nguy\u00ean c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">C\u1ea5p \u0111\u1ed9 b\u1ea3o m\u1eadt<\/span><\/td>\n<td><span style=\"font-weight: 400;\">B\u1ea3o m\u1eadt \u1edf c\u1ea5p \u0111\u1ed9 k\u1ebft n\u1ed1i m\u1ea1ng, x\u00e1c minh danh t\u00ednh tr\u01b0\u1edbc khi truy c\u1eadp c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">B\u1ea3o m\u1eadt \u1edf c\u1ea5p \u0111\u1ed9 truy c\u1eadp d\u1eef li\u1ec7u, x\u00e1c minh quy\u1ec1n thao t\u00e1c tr\u00ean c\u00e1c t\u00e0i nguy\u00ean c\u1ee5 th\u1ec3.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Ph\u01b0\u01a1ng ph\u00e1p x\u00e1c th\u1ef1c<\/span><\/td>\n<td><span style=\"font-weight: 400;\">&#8211; D\u1ef1a tr\u00ean ch\u1ee9ng ch\u1ec9 s\u1ed1 (TLS\/SSL \u0111\u1ec3 b\u1ea3o m\u1eadt v\u00e0 x\u00e1c th\u1ef1c k\u1ebft n\u1ed1i, X.509 certificates \u0111\u1ec3 \u0111\u1ecbnh danh m\u00e1y kh\u00e1ch).<\/span><\/td>\n<td><span style=\"font-weight: 400;\">&#8211; D\u1ef1a tr\u00ean t\u00ean ng\u01b0\u1eddi d\u00f9ng v\u00e0 m\u1eadt kh\u1ea9u ho\u1eb7c qua d\u1ecbch v\u1ee5 x\u00e1c th\u1ef1c b\u00ean ngo\u00e0i nh\u01b0 LDAP ho\u1eb7c Kerberos.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">&#8211; Ph\u00e2n quy\u1ec1n cho ng\u01b0\u1eddi d\u00f9ng b\u1eb1ng Role-Based Access Control (RBAC)<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">C\u00e1ch thi\u1ebft l\u1eadp<\/span><\/td>\n<td><span style=\"font-weight: 400;\">&#8211; C\u1ea5u h\u00ecnh m\u00e1y ch\u1ee7 MongoDB y\u00eau c\u1ea7u ch\u1ee9ng ch\u1ec9 h\u1ee3p l\u1ec7 khi k\u1ebft n\u1ed1i.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">&#8211; K\u00edch ho\u1ea1t ch\u1ebf \u0111\u1ed9 TLS\/SSL \u0111\u1ec3 m\u00e3 h\u00f3a v\u00e0 x\u00e1c th\u1ef1c k\u1ebft n\u1ed1i.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">&#8211; T\u1ea1o ng\u01b0\u1eddi d\u00f9ng trong c\u01a1 s\u1edf d\u1eef li\u1ec7u MongoDB v\u1edbi vai tr\u00f2 c\u1ee5 th\u1ec3.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">&#8211; G\u00e1n quy\u1ec1n h\u1ea1n cho t\u1eebng vai tr\u00f2 d\u1ef1a tr\u00ean RBAC.<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Quy\u1ec1n truy c\u1eadp d\u1eef li\u1ec7u<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Kh\u00f4ng cung c\u1ea5p quy\u1ec1n truy c\u1eadp d\u1eef li\u1ec7u, ch\u1ec9 \u0111\u1ea3m b\u1ea3o k\u1ebft n\u1ed1i \u0111\u1ebfn m\u00e1y ch\u1ee7 MongoDB l\u00e0 h\u1ee3p l\u1ec7.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Quy\u1ec1n truy c\u1eadp c\u1ee5 th\u1ec3 v\u00e0o d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c g\u00e1n d\u1ef1a tr\u00ean vai tr\u00f2 (Admin, ReadOnly, ReadWrite, \u2026).<\/span><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">B\u1ea3o m\u1eadt n\u00e2ng cao<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Ng\u0103n k\u1ebb t\u1ea5n c\u00f4ng truy c\u1eadp tr\u00e1i ph\u00e9p t\u1eeb m\u00e1y kh\u00e1ch kh\u00f4ng \u0111\u01b0\u1ee3c x\u00e1c th\u1ef1c ho\u1eb7c kh\u00f4ng c\u00f3 ch\u1ee9ng ch\u1ec9 h\u1ee3p l\u1ec7.<\/span><\/td>\n<td><span style=\"font-weight: 400;\">Ng\u0103n ng\u01b0\u1eddi d\u00f9ng th\u1ef1c hi\u1ec7n c\u00e1c thao t\u00e1c tr\u00e1i ph\u00e9p tr\u00ean c\u01a1 s\u1edf d\u1eef li\u1ec7u ho\u1eb7c v\u01b0\u1ee3t qu\u00e1 quy\u1ec1n h\u1ea1n \u0111\u01b0\u1ee3c c\u1ea5p.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><span class=\"ez-toc-section\" id=\"Cac_cau_hoi_phong_van_%E2%80%8B%E2%80%8BNoSQL_Integration_tich_hop_NoSQL\"><\/span><b>C\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n \u200b\u200bNoSQL Integration (t\u00edch h\u1ee3p NoSQL)<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><b>Polyglot Persistence l\u00e0 g\u00ec?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Polyglot Persistence l\u00e0 kh\u00e1i ni\u1ec7m s\u1eed d\u1ee5ng nhi\u1ec1u lo\u1ea1i c\u01a1 s\u1edf d\u1eef li\u1ec7u kh\u00e1c nhau trong c\u00f9ng m\u1ed9t h\u1ec7 th\u1ed1ng \u0111\u1ec3 t\u1eadn d\u1ee5ng \u01b0u \u0111i\u1ec3m c\u1ee7a t\u1eebng lo\u1ea1i c\u01a1 s\u1edf d\u1eef li\u1ec7u cho c\u00e1c t\u00e1c v\u1ee5 c\u1ee5 th\u1ec3. Thay v\u00ec ch\u1ec9 d\u1ef1a v\u00e0o m\u1ed9t lo\u1ea1i c\u01a1 s\u1edf d\u1eef li\u1ec7u duy nh\u1ea5t, Polyglot Persistence cho ph\u00e9p b\u1ea1n ch\u1ecdn c\u01a1 s\u1edf d\u1eef li\u1ec7u ph\u00f9 h\u1ee3p nh\u1ea5t v\u1edbi t\u1eebng tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng, ch\u1eb3ng h\u1ea1n nh\u01b0:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng MongoDB cho l\u01b0u tr\u1eef d\u1eef li\u1ec7u t\u00e0i li\u1ec7u.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng Cassandra cho d\u1eef li\u1ec7u ph\u00e2n t\u00e1n.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng SQL Server cho d\u1eef li\u1ec7u giao d\u1ecbch.<\/span><\/li>\n<\/ul>\n<h4><b>L\u1ee3i \u00edch v\u00e0 th\u00e1ch th\u1ee9c c\u1ee7a Polyglot Persistence<\/b><\/h4>\n<table>\n<tbody>\n<tr>\n<td><b>L\u1ee3i \u00edch<\/b><\/td>\n<td><b>Th\u00e1ch th\u1ee9c<\/b><\/td>\n<\/tr>\n<tr>\n<td><b>T\u1ed1i \u01b0u h\u00f3a hi\u1ec7u su\u1ea5t:<\/b><span style=\"font-weight: 400;\"> T\u1eadn d\u1ee5ng \u0111i\u1ec3m m\u1ea1nh c\u1ee7a t\u1eebng lo\u1ea1i c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/span><\/td>\n<td><b>Qu\u1ea3n l\u00fd ph\u1ee9c t\u1ea1p<\/b><span style=\"font-weight: 400;\">: Ph\u1ea3i thi\u1ebft l\u1eadp, v\u1eadn h\u00e0nh v\u00e0 b\u1ea3o tr\u00ec nhi\u1ec1u lo\u1ea1i c\u01a1 s\u1edf d\u1eef li\u1ec7u c\u00f9ng l\u00fac, \u0111\u00f2i h\u1ecfi \u0111\u1ed9i ng\u0169 k\u1ef9 thu\u1eadt c\u00f3 ki\u1ebfn th\u1ee9c \u0111a d\u1ea1ng.<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Linh ho\u1ea1t:<\/b><span style=\"font-weight: 400;\"> Ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng \u0111a d\u1ea1ng v\u1edbi nhi\u1ec1u y\u00eau c\u1ea7u l\u01b0u tr\u1eef kh\u00e1c nhau.<\/span><\/td>\n<td><b>Chi ph\u00ed cao<\/b><span style=\"font-weight: 400;\">: Chi ph\u00ed ph\u00e1t tri\u1ec3n, tri\u1ec3n khai v\u00e0 b\u1ea3o tr\u00ec c\u00f3 th\u1ec3 cao h\u01a1n so v\u1edbi vi\u1ec7c s\u1eed d\u1ee5ng m\u1ed9t lo\u1ea1i c\u01a1 s\u1edf d\u1eef li\u1ec7u duy nh\u1ea5t.<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>T\u0103ng kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng:<\/b><span style=\"font-weight: 400;\"> M\u1ed7i c\u01a1 s\u1edf d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a cho m\u1ed9t nhi\u1ec7m v\u1ee5 c\u1ee5 th\u1ec3.<\/span><\/td>\n<td rowspan=\"2\"><b>Ph\u1ee9c t\u1ea1p trong<\/b> <b>\u0111\u1ed3ng b\u1ed9 h\u00f3a d\u1eef li\u1ec7u<\/b><span style=\"font-weight: 400;\">: \u0110\u1ea3m b\u1ea3o d\u1eef li\u1ec7u nh\u1ea5t qu\u00e1n gi\u1eefa c\u00e1c c\u01a1 s\u1edf d\u1eef li\u1ec7u kh\u00e1c nhau l\u00e0 m\u1ed9t th\u00e1ch th\u1ee9c l\u1edbn, \u0111\u1eb7c bi\u1ec7t trong c\u00e1c h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>C\u1ea3i thi\u1ec7n b\u1ea3o m\u1eadt:<\/b><span style=\"font-weight: 400;\"> Gi\u1ea3m r\u1ee7i ro b\u1eb1ng c\u00e1ch ph\u00e2n t\u00e1n d\u1eef li\u1ec7u nh\u1ea1y c\u1ea3m v\u00e0o c\u00e1c h\u1ec7 qu\u1ea3n tr\u1ecb an to\u00e0n.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><b>Khi n\u00e0o s\u1eed d\u1ee5ng Polyglot Persistence?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">M\u1eb7c d\u00f9 Polyglot Persistence c\u00f3 th\u1ec3 g\u00e2y ra m\u1ed9t s\u1ed1 h\u1ea1n ch\u1ebf nh\u1ea5t \u0111\u1ecbnh nh\u01b0ng v\u1edbi kh\u1ea3 n\u0103ng t\u1eadn d\u1ee5ng t\u1ed1i \u0111a th\u1ebf m\u1ea1nh ri\u00eang c\u1ee7a t\u1eebng c\u00f4ng c\u1ee5, n\u00f3 tr\u1edf th\u00e0nh m\u1ed9t gi\u1ea3i ph\u00e1p ph\u00f9 h\u1ee3p cho c\u00e1c h\u1ec7 th\u1ed1ng l\u1edbn v\u00e0 \u0111a d\u1ea1ng v\u1edbi m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p nh\u01b0:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>\u1ee8ng d\u1ee5ng y\u00eau c\u1ea7u hi\u1ec7u su\u1ea5t cao<\/b><span style=\"font-weight: 400;\">: Khi c\u1ea7n t\u0103ng t\u1ed1c \u0111\u1ed9 truy xu\u1ea5t d\u1eef li\u1ec7u ho\u1eb7c gi\u1ea3m \u0111\u1ed9 tr\u1ec5 trong c\u00e1c th\u00e0nh ph\u1ea7n kh\u00e1c nhau c\u1ee7a h\u1ec7 th\u1ed1ng. V\u00ed d\u1ee5 Redis \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng l\u00e0m b\u1ed9 nh\u1edb \u0111\u1ec7m \u0111\u1ec3 gi\u1ea3m t\u1ea3i cho c\u01a1 s\u1edf d\u1eef li\u1ec7u ch\u00ednh trong c\u00e1c \u1ee9ng d\u1ee5ng th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>H\u1ec7 th\u1ed1ng ph\u1ee9c t\u1ea1p v\u00e0 \u0111a ch\u1ee9c n\u0103ng<\/b><span style=\"font-weight: 400;\">: C\u00e1c h\u1ec7 th\u1ed1ng l\u1edbn nh\u01b0 th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed ho\u1eb7c m\u1ea1ng x\u00e3 h\u1ed9i th\u01b0\u1eddng c\u1ea7n t\u00edch h\u1ee3p nhi\u1ec1u lo\u1ea1i c\u01a1 s\u1edf d\u1eef li\u1ec7u \u0111\u1ec3 x\u1eed l\u00fd c\u00e1c t\u00e1c v\u1ee5 kh\u00e1c nhau (g\u1ee3i \u00fd s\u1ea3n ph\u1ea9m, qu\u1ea3n l\u00fd \u0111\u01a1n h\u00e0ng, ph\u00e2n t\u00edch h\u00e0nh vi ng\u01b0\u1eddi d\u00f9ng) v\u00e0 x\u1eed l\u00fd \u0111a d\u1ea1ng lo\u1ea1i d\u1eef li\u1ec7u. V\u00ed d\u1ee5 v\u1edbi m\u1ed9t h\u1ec7 th\u1ed1ng th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng SQL (MySQL, PostgreSQL) \u0111\u1ec3 l\u01b0u th\u00f4ng tin giao d\u1ecbch, kh\u00e1ch h\u00e0ng, s\u1eed d\u1ee5ng (NoSQL (MongoDB) \u0111\u1ec3 l\u01b0u th\u00f4ng tin s\u1ea3n ph\u1ea9m v\u1edbi c\u1ea5u tr\u00fac linh ho\u1ea1t v\u00e0 s\u1eed d\u1ee5ng Key-Value Store (Redis) l\u01b0u tr\u1eef gi\u1ecf h\u00e0ng \u0111\u1ec3 t\u0103ng t\u1ed1c \u0111\u1ed9 truy c\u1eadp.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>\u1ee8ng d\u1ee5ng c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng d\u1eef li\u1ec7u l\u1edbn v\u00e0 y\u00eau c\u1ea7u kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng linh ho\u1ea1t<\/b><span style=\"font-weight: 400;\">: Khi c\u1ea7n l\u01b0u tr\u1eef d\u1eef li\u1ec7u kh\u1ed5ng l\u1ed3 v\u00e0 y\u00eau c\u1ea7u m\u1edf r\u1ed9ng theo chi\u1ec1u ngang m\u00e0 kh\u00f4ng l\u00e0m gi\u1ea3m hi\u1ec7u su\u1ea5t.V\u00ed d\u1ee5 DynamoDB \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 l\u01b0u tr\u1eef d\u1eef li\u1ec7u IoT v\u1edbi kh\u1ea3 n\u0103ng x\u1eed l\u00fd write-heavy v\u00e0 k\u1ebft h\u1ee3p v\u1edbi HDFS \u0111\u1ec3 l\u01b0u tr\u1eef l\u00e2u d\u00e0i.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Khi h\u1ec7 th\u1ed1ng c\u1ea7n t\u00edch h\u1ee3p nhi\u1ec1u ngu\u1ed3n d\u1eef li\u1ec7u<\/b><span style=\"font-weight: 400;\">: N\u1ebfu h\u1ec7 th\u1ed1ng ph\u1ea3i thu th\u1eadp v\u00e0 t\u00edch h\u1ee3p d\u1eef li\u1ec7u t\u1eeb nhi\u1ec1u ngu\u1ed3n (API, logs, d\u1eef li\u1ec7u ng\u01b0\u1eddi d\u00f9ng, d\u1eef li\u1ec7u b\u00ean ngo\u00e0i) th\u00ec Polyglot Persistence l\u00e0 gi\u1ea3i ph\u00e1p ph\u00f9 h\u1ee3p. V\u00ed d\u1ee5 b\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng MongoDB \u0111\u1ec3 l\u01b0u tr\u1eef d\u1eef li\u1ec7u ng\u01b0\u1eddi d\u00f9ng, s\u1eed d\u1ee5ng Redis l\u00e0m b\u1ed9 nh\u1edb \u0111\u1ec7m cho d\u1eef li\u1ec7u t\u1ea1m th\u1eddi v\u00e0 s\u1eed d\u1ee5ng PostgreSQL qu\u1ea3n l\u00fd c\u00e1c b\u1ea3ng b\u00e1o c\u00e1o.<\/span><\/li>\n<\/ul>\n<h3><b>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 di chuy\u1ec3n d\u1eef li\u1ec7u t\u1eeb SQL sang NoSQL?\u00a0<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Vi\u1ec7c chuy\u1ec3n d\u1eef li\u1ec7u t\u1eeb SQL sang NoSQL \u0111\u00f2i h\u1ecfi s\u1ef1 chuy\u1ec3n \u0111\u1ed5i c\u1ea3 v\u1ec1 d\u1eef li\u1ec7u l\u1eabn t\u01b0 duy thi\u1ebft k\u1ebf v\u00ec c\u00e1ch l\u01b0u tr\u1eef d\u1eef li\u1ec7u \u1edf SQL v\u00e0 NoSQL ho\u00e0n to\u00e0n kh\u00e1c nhau. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 c\u00e1c b\u01b0\u1edbc ch\u00ednh:<\/span><\/p>\n<h4><b>Ph\u00e2n t\u00edch d\u1eef li\u1ec7u<\/b><\/h4>\n<p><span style=\"font-weight: 400;\">Ph\u00e2n t\u00edch d\u1eef li\u1ec7u hi\u1ec7n t\u1ea1i: Tr\u01b0\u1edbc khi di chuy\u1ec3n d\u1eef li\u1ec7u, c\u1ea7n ph\u00e2n t\u00edch k\u1ef9 l\u01b0\u1ee1ng c\u1ea5u tr\u00fac d\u1eef li\u1ec7u hi\u1ec7n t\u1ea1i trong SQL \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh c\u00e1ch t\u1ed5 ch\u1ee9c d\u1eef li\u1ec7u trong NoSQL. C\u00e1c \u0111\u1eb7c tr\u01b0ng c\u1ea7n ph\u00e2n t\u00edch l\u01b0u \u00fd nh\u01b0:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">X\u00e1c \u0111\u1ecbnh b\u1ea3ng v\u00e0 vai tr\u00f2 c\u1ee7a ch\u00fang<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Ph\u00e2n t\u00edch c\u00e1c m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c b\u1ea3ng<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Ph\u00e2n lo\u1ea1i ki\u1ec3u d\u1eef li\u1ec7u \u0111\u1ec3 ch\u1ecdn c\u00e1ch chuy\u1ec3n \u0111\u1ed5i cho ph\u00f9 h\u1ee3p<\/span><\/li>\n<\/ul>\n<h4><b>Thi\u1ebft k\u1ebf c\u1ea5u tr\u00fac m\u1edbi<\/b><\/h4>\n<p><span style=\"font-weight: 400;\">Sau khi hi\u1ec3u \u0111\u01b0\u1ee3c \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a d\u1eef li\u1ec7u v\u00e0 tu\u1ef3 v\u00e0o lo\u1ea1i d\u1eef li\u1ec7u m\u00e0 \u0111\u01b0a ra l\u1ef1a ch\u1ecdn lo\u1ea1i c\u01a1 s\u1edf d\u1eef li\u1ec7u NoSQL v\u1edbi c\u00e1c y\u1ebfu t\u1ed1 nh\u01b0:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Lo\u1ea1i c\u01a1 s\u1edf d\u1eef li\u1ec7u NoSQL ph\u00f9 h\u1ee3p:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Document-based (MongoDB): Ph\u00f9 h\u1ee3p v\u1edbi d\u1eef li\u1ec7u b\u00e1n c\u1ea5u tr\u00fac ho\u1eb7c phi c\u1ea5u tr\u00fac.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Key-Value Store (Redis): T\u1ed1t cho caching ho\u1eb7c l\u01b0u tr\u1eef d\u1eef li\u1ec7u t\u1ea1m th\u1eddi.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Columnar Store (Cassandra): Ph\u00f9 h\u1ee3p v\u1edbi d\u1eef li\u1ec7u chu\u1ed7i th\u1eddi gian ho\u1eb7c x\u1eed l\u00fd kh\u1ed1i l\u01b0\u1ee3ng l\u1edbn d\u1eef li\u1ec7u.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Graph Database (Neo4j): Ph\u00e2n t\u00edch m\u1ed1i quan h\u1ec7 ph\u1ee9c t\u1ea1p gi\u1eefa c\u00e1c th\u1ef1c th\u1ec3.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">X\u00e1c \u0111\u1ecbnh c\u00e1ch t\u1ed5 ch\u1ee9c d\u1eef li\u1ec7u:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Nh\u00fang d\u1eef li\u1ec7u (Embedding): L\u01b0u tr\u1eef th\u00f4ng tin li\u00ean quan trong c\u00f9ng m\u1ed9t t\u00e0i li\u1ec7u. V\u00ed d\u1ee5 m\u1ed9t ng\u01b0\u1eddi d\u00f9ng c\u00f9ng danh s\u00e1ch \u0111\u01a1n h\u00e0ng c\u1ee7a h\u1ecd \u0111\u01b0\u1ee3c l\u01b0u trong m\u1ed9t t\u00e0i li\u1ec7u MongoDB.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Tham chi\u1ebfu d\u1eef li\u1ec7u (Referencing): S\u1eed d\u1ee5ng ID \u0111\u1ec3 li\u00ean k\u1ebft c\u00e1c t\u00e0i li\u1ec7u ri\u00eang bi\u1ec7t. V\u00ed d\u1ee5 nh\u01b0 l\u01b0u th\u00f4ng tin ng\u01b0\u1eddi d\u00f9ng trong m\u1ed9t t\u00e0i li\u1ec7u v\u00e0 c\u00e1c \u0111\u01a1n h\u00e0ng trong m\u1ed9t t\u00e0i li\u1ec7u kh\u00e1c.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">V\u00ed d\u1ee5 ta c\u00f3 2 b\u1ea3ng <\/span><i><span style=\"font-weight: 400;\">users<\/span><\/i><span style=\"font-weight: 400;\"> v\u00e0 <\/span><i><span style=\"font-weight: 400;\">orders<\/span><\/i><span style=\"font-weight: 400;\"> nh\u01b0 sau trong SQL:<\/span><\/p>\n<pre><span style=\"font-weight: 400;\">users:<\/span>\r\n\r\n<span style=\"font-weight: 400;\">| user_id |\u00a0 \u00a0 name\u00a0 |\u00a0<\/span>\r\n\r\n<span style=\"font-weight: 400;\">|---------|----------|\u00a0<\/span>\r\n\r\n<span style=\"font-weight: 400;\">|\u00a0 \u00a0 1\u00a0 \u00a0 | John Doe |\u00a0<\/span>\r\n\r\n<span style=\"font-weight: 400;\">orders:\u00a0<\/span>\r\n\r\n<span style=\"font-weight: 400;\">| order_id | user_id | amount |<\/span>\r\n\r\n<span style=\"font-weight: 400;\">|----------|---------|--------|\u00a0<\/span>\r\n\r\n<span style=\"font-weight: 400;\">|101 \u00a0 \u00a0 \u00a0 | 1 \u00a0 \u00a0 \u00a0 | 50 \u00a0 \u00a0 |\u00a0<\/span>\r\n\r\n<span style=\"font-weight: 400;\">| 102\u00a0 \u00a0 \u00a0 | 1 \u00a0 \u00a0 \u00a0 | 100\u00a0 \u00a0 |<\/span><\/pre>\n<p><span style=\"font-weight: 400;\">N\u1ebfu ta chuy\u1ec3n th\u00e0nh t\u00e0i li\u1ec7u NoSQL v\u1edbi c\u1ea5u tr\u00fac nh\u00fang (embedded) th\u00ec s\u1ebd c\u00f3 d\u1ea1ng sau:<\/span><\/p>\n<pre><span style=\"font-weight: 400;\">{<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0\"user_id\": \"1\",<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0\"name\": \"John Doe\",<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0\"orders\": [<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0{ \"order_id\": \"101\", \"amount\": 50 },\u00a0<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0{ \"order_id\": \"102\", \"amount\": 100}\u00a0<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0]\u00a0<\/span>\r\n\r\n<span style=\"font-weight: 400;\">}<\/span><\/pre>\n<h4><b>Xu\u1ea5t d\u1eef li\u1ec7u t\u1eeb SQL<\/b><\/h4>\n<p><span style=\"font-weight: 400;\">D\u1eef li\u1ec7u t\u1eeb c\u01a1 s\u1edf d\u1eef li\u1ec7u SQL \u0111\u01b0\u1ee3c xu\u1ea5t sang c\u00e1c \u0111\u1ecbnh d\u1ea1ng ph\u00f9 h\u1ee3p nh\u01b0 CSV, JSON ho\u1eb7c XML. V\u00ed d\u1ee5 trong MySQL s\u1ebd c\u00f3 c\u00fa ph\u00e1p nh\u01b0 sau:<\/span><\/p>\n<pre><span style=\"font-weight: 400;\">mysqldump -u root -p --no-create-info --tab=\/path\/to\/export mydatabase<\/span><\/pre>\n<p><span style=\"font-weight: 400;\">V\u1edbi c\u00fa ph\u00e1p tr\u00ean ta s\u1ebd \u0111\u01b0\u1ee3c 2 file l\u00e0 users.csv ch\u1ee9a th\u00f4ng tin ng\u01b0\u1eddi d\u00f9ng v\u00e0 orders.csv ch\u1ee9a th\u00f4ng tin \u0111\u01a1n h\u00e0ng.<\/span><\/p>\n<h4><b>Chuy\u1ec3n \u0111\u1ed5i d\u1eef li\u1ec7u sang \u0111\u1ecbnh d\u1ea1ng NoSQL<\/b><\/h4>\n<p><span style=\"font-weight: 400;\">Ti\u1ebfp theo ta s\u1ebd chuy\u1ec3n \u0111\u1ed5i d\u1eef li\u1ec7u SQL \u0111\u1ec3 t\u01b0\u01a1ng th\u00edch v\u1edbi c\u1ea5u tr\u00fac NoSQL.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">V\u00ed d\u1ee5 n\u1ebfu b\u1ea1n s\u1eed d\u1ee5ng Python \u0111\u1ec3 chuy\u1ec3n \u0111\u1ed5i th\u00ec s\u1ebd c\u00f3 c\u00fa ph\u00e1p nh\u01b0 sau:<\/span><\/p>\n<pre><span style=\"font-weight: 400;\">import json<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0# Chuy\u1ec3n \u0111\u1ed5i d\u1eef li\u1ec7u t\u1eeb SQL sang JSON\u00a0<\/span>\r\n\r\n<span style=\"font-weight: 400;\">sql_data = {\u00a0<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\"user_id\": 1,<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\"name\": \"John Doe\",<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\"orders\": [\u00a0<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{\"order_id\": 101, \"amount\": 50},<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{\"order_id\": 102, \"amount\": 100} ]\u00a0<\/span>\r\n\r\n<span style=\"font-weight: 400;\">\u00a0\u00a0\u00a0\u00a0\u00a0}\u00a0<\/span>\r\n\r\n<span style=\"font-weight: 400;\">json_data = json.dumps(sql_data)\u00a0<\/span><\/pre>\n<h4><b>Nh\u1eadp d\u1eef li\u1ec7u v\u00e0o NoSQL<\/b><\/h4>\n<p><span style=\"font-weight: 400;\">Ti\u1ebfp theo, ta s\u1ebd s\u1eed d\u1ee5ng c\u00e1c c\u00f4ng c\u1ee5 ho\u1eb7c API c\u1ee7a NoSQL \u0111\u1ec3 nh\u1eadp d\u1eef li\u1ec7u<\/span><\/p>\n<p><span style=\"font-weight: 400;\">V\u00ed d\u1ee5 trong MongoDb, ta s\u1ebd s\u1eed d\u1ee5ng <\/span><span style=\"font-weight: 400;\">mongoimport<\/span><span style=\"font-weight: 400;\"> \u0111\u1ec3 nh\u1eadp t\u1ec7p JSON v\u1edbi c\u00fa ph\u00e1p nh\u01b0 sau:<\/span><\/p>\n<pre><span style=\"font-weight: 400;\">mongoimport --db mydatabase --collection users --file users.json --jsonArray<\/span><\/pre>\n<p><span style=\"font-weight: 400;\">V\u00ed d\u1ee5 trong Cassandra, ta s\u1ebd s\u1eed d\u1ee5ng CQLSH \u0111\u1ec3 nh\u1eadp d\u1eef li\u1ec7u t\u1eeb t\u1ec7p CSV v\u1edbi c\u00fa ph\u00e1p nh\u01b0 sau:<\/span><\/p>\n<pre><span style=\"font-weight: 400;\">COPY users (user_id, name) FROM 'users.csv' WITH HEADER = TRUE;<\/span><\/pre>\n<h4><b>Ki\u1ec3m tra v\u00e0 x\u00e1c th\u1ef1c d\u1eef li\u1ec7u<\/b><\/h4>\n<p><span style=\"font-weight: 400;\">Cu\u1ed1i c\u00f9ng, ta s\u1ebd so s\u00e1nh d\u1eef li\u1ec7u trong NoSQL v\u1edbi d\u1eef li\u1ec7u g\u1ed1c t\u1eeb SQL \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o d\u1eef li\u1ec7u kh\u00f4ng b\u1ecb m\u1ea5t ho\u1eb7c sai l\u1ec7ch. \u0110\u1ec3 c\u1ea9n th\u1eadn h\u01a1n th\u00ec b\u1ea1n c\u00f3 th\u1ec3 th\u1eed nghi\u1ec7m m\u1ed9t s\u1ed1 truy v\u1ea5n tr\u00ean NoSQL \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c t\u1ed5 ch\u1ee9c v\u00e0 truy xu\u1ea5t \u0111\u00fang c\u00e1ch.<\/span><\/p>\n<h3><b>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 t\u1ed1i \u01b0u h\u00f3a v\u00e0 b\u1ea3o tr\u00ec sau khi di chuy\u1ec3n?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Sau khi ho\u00e0n t\u1ea5t vi\u1ec7c di chuy\u1ec3n, c\u1ea7n th\u1ef1c hi\u1ec7n t\u1ed1i \u01b0u h\u00f3a v\u00e0 b\u1ea3o tr\u00ec \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o h\u1ec7 th\u1ed1ng ho\u1ea1t \u0111\u1ed9ng hi\u1ec7u qu\u1ea3 v\u00e0 \u1ed5n \u0111\u1ecbnh:<\/span><\/p>\n<h4><b>T\u1ed1i \u01b0u h\u00f3a truy v\u1ea5n<\/b><\/h4>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Ph\u00e2n t\u00edch c\u00e1c truy v\u1ea5n th\u1ef1c t\u1ebf tr\u00ean NoSQL \u0111\u1ec3 ph\u00e1t hi\u1ec7n \u0111i\u1ec3m y\u1ebfu.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">T\u1ea1o ch\u1ec9 m\u1ee5c ph\u00f9 h\u1ee3p cho c\u00e1c tr\u01b0\u1eddng th\u01b0\u1eddng xuy\u00ean \u0111\u01b0\u1ee3c truy v\u1ea5n \u0111\u1ec3 t\u0103ng t\u1ed1c \u0111\u1ed9 \u0111\u1ecdc.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Tr\u00e1nh l\u1ea1m d\u1ee5ng ch\u1ec9 m\u1ee5c v\u00ec c\u00f3 th\u1ec3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u1ed1c \u0111\u1ed9 ghi.<\/span><\/li>\n<\/ul>\n<h4><b>Ph\u00e2n b\u1ed5 v\u00e0 c\u00e2n b\u1eb1ng d\u1eef li\u1ec7u<\/b><\/h4>\n<p><span style=\"font-weight: 400;\">\u0110\u1ed1i v\u1edbi c\u01a1 s\u1edf d\u1eef li\u1ec7u ph\u00e2n t\u00e1n nh\u01b0 MongoDB ho\u1eb7c Cassandra, c\u1ea7n \u0111\u1ea3m b\u1ea3o d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c ph\u00e2n m\u1ea3nh (sharding) v\u00e0 ph\u00e2n ph\u1ed1i \u0111\u1ed3ng \u0111\u1ec1u gi\u1eefa c\u00e1c n\u00fat.<\/span><\/p>\n<h4><b>T\u1ed1i \u01b0u h\u00f3a dung l\u01b0\u1ee3ng l\u01b0u tr\u1eef<\/b><\/h4>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">S\u1eed d\u1ee5ng c\u01a1 ch\u1ebf TTL (Time-to-Live) \u0111\u1ec3 t\u1ef1 \u0111\u1ed9ng x\u00f3a d\u1eef li\u1ec7u c\u0169 ho\u1eb7c kh\u00f4ng c\u00f2n c\u1ea7n thi\u1ebft.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Ki\u1ec3m tra v\u00e0 d\u1ecdn d\u1eb9p c\u00e1c b\u1ea3n ghi d\u01b0 th\u1eeba \u0111\u1ec3 ti\u1ebft ki\u1ec7m t\u00e0i nguy\u00ean.<\/span><\/li>\n<\/ul>\n<h4><b>Gi\u00e1m s\u00e1t v\u00e0 b\u1ea3o tr\u00ec h\u1ec7 th\u1ed1ng<\/b><\/h4>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Tri\u1ec3n khai c\u00e1c c\u00f4ng c\u1ee5 gi\u00e1m s\u00e1t \u0111\u1ec3 theo d\u00f5i hi\u1ec7u su\u1ea5t \u0111\u1ecdc\/ghi v\u00e0 ph\u00e1t hi\u1ec7n c\u00e1c v\u1ea5n \u0111\u1ec1 nh\u01b0 bottleneck ho\u1eb7c l\u1ed7i h\u1ec7 th\u1ed1ng.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">L\u00ean k\u1ebf ho\u1ea1ch sao l\u01b0u \u0111\u1ecbnh k\u1ef3 \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o an to\u00e0n d\u1eef li\u1ec7u.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Ki\u1ec3m tra v\u00e0 c\u1eadp nh\u1eadt c\u00e1c phi\u00ean b\u1ea3n ph\u1ea7n m\u1ec1m NoSQL \u0111\u1ec3 t\u1eadn d\u1ee5ng t\u00ednh n\u0103ng m\u1edbi v\u00e0 v\u00e1 l\u1ed7i b\u1ea3o m\u1eadt.<\/span><\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Tong_ket_cau_hoi_phong_van_NoSQL\"><\/span><b>T\u1ed5ng k\u1ebft c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NoSQL<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">NoSQL kh\u00f4ng ch\u1ec9 l\u00e0 m\u1ed9t xu h\u01b0\u1edbng, m\u00e0 c\u00f2n l\u00e0 c\u00f4ng c\u1ee5 m\u1ea1nh m\u1ebd \u0111\u1ec3 x\u1eed l\u00fd d\u1eef li\u1ec7u l\u1edbn v\u00e0 t\u1ed1i \u01b0u h\u00f3a h\u1ec7 th\u1ed1ng. V\u00e0 kh\u00f4ng ch\u1ec9 d\u1eebng l\u1ea1i \u1edf l\u00fd thuy\u1ebft, vi\u1ec7c ch\u1ee9ng minh b\u1ea1n \u0111\u00e3 th\u1ef1c s\u1ef1 s\u1eed d\u1ee5ng v\u00e0 gi\u1ea3i quy\u1ebft c\u00e1c th\u00e1ch th\u1ee9c li\u00ean quan \u0111\u1ebfn NoSQL qua c\u00e1c v\u00ed d\u1ee5 c\u1ee5 th\u1ec3 v\u00e0 kinh nghi\u1ec7m s\u1eed d\u1ee5ng th\u1ef1c t\u1ebf s\u1ebd gi\u00fap b\u1ea1n ghi \u0111i\u1ec3m trong m\u1eaft nh\u00e0 tuy\u1ec3n d\u1ee5ng.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">ITviec hy v\u1ecdng b\u00e0i vi\u1ebft tr\u00ean \u0111\u00e3 cung c\u1ea5p cho b\u1ea1n nh\u1eefng c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NoSQL h\u1eefu \u00edch \u0111\u1ec3 s\u1eb5n s\u00e0ng cho bu\u1ed5i ph\u1ecfng v\u1ea5n NoSQL.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>V\u1edbi kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng linh ho\u1ea1t, hi\u1ec7u su\u1ea5t cao, NoSQL \u0111\u00e3 tr\u1edf th\u00e0nh l\u1ef1a ch\u1ecdn h\u00e0ng \u0111\u1ea7u cho nhi\u1ec1u doanh nghi\u1ec7p hi\u1ec7n \u0111\u1ea1i v\u00e0 l\u00e0 k\u1ef9 n\u0103ng c\u1ea7n c\u00f3 cho nhi\u1ec1u v\u1ecb tr\u00ed ngh\u1ec1 nghi\u1ec7p. Ch\u00ednh v\u00ec th\u1ebf, \u0111\u1ec3 chu\u1ea9n b\u1ecb cho bu\u1ed5i ph\u1ecfng v\u1ea5n chuy\u00ean m\u00f4n s\u1eafp t\u1edbi, sau \u0111\u00e2y l\u00e0 30+ c\u00e2u [&hellip;]<\/p>\n","protected":false},"author":209,"featured_media":83584,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_gspb_post_css":"","footnotes":""},"categories":[109,105],"tags":[],"class_list":["post-83254","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-chuyen-mon-it","category-phong-van-it"],"blocksy_meta":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.8 (Yoast SEO v27.7) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Top 30+ c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NoSQL th\u01b0\u1eddng g\u1eb7p nh\u1ea5t - ITviec Blog<\/title>\n<meta name=\"description\" content=\"Kh\u00e1m ph\u00e1 c\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NoSQL ph\u1ed5 bi\u1ebfn, t\u1eeb ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n \u0111\u1ebfn chuy\u00ean s\u00e2u, c\u00f9ng c\u00e2u tr\u1ea3 l\u1eddi chi ti\u1ebft gi\u00fap b\u1ea1n t\u1ef1 tin chinh ph\u1ee5c.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/itviec.com\/blog\/cau-hoi-phong-van-nosql\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Top 30+ c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NoSQL th\u01b0\u1eddng g\u1eb7p nh\u1ea5t\" \/>\n<meta property=\"og:description\" content=\"V\u1edbi kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng linh ho\u1ea1t, hi\u1ec7u su\u1ea5t cao, NoSQL \u0111\u00e3 tr\u1edf th\u00e0nh l\u1ef1a ch\u1ecdn h\u00e0ng \u0111\u1ea7u cho nhi\u1ec1u doanh nghi\u1ec7p hi\u1ec7n \u0111\u1ea1i v\u00e0 l\u00e0 k\u1ef9 n\u0103ng c\u1ea7n c\u00f3 cho nhi\u1ec1u v\u1ecb tr\u00ed\" \/>\n<meta property=\"og:url\" content=\"https:\/\/itviec.com\/blog\/cau-hoi-phong-van-nosql\/\" \/>\n<meta property=\"og:site_name\" content=\"ITviec Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/ITviec\" \/>\n<meta property=\"article:published_time\" content=\"2024-12-30T09:30:06+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/itviec.com\/blog\/wp-content\/uploads\/2024\/12\/cau-hoi-phong-van-NoSQL-vippro.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1500\" \/>\n\t<meta property=\"og:image:height\" content=\"790\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"M\u1ef9 Duy\u00ean\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@ITviec\" \/>\n<meta name=\"twitter:site\" content=\"@ITviec\" \/>\n<meta name=\"twitter:label1\" content=\"\u0110\u01b0\u1ee3c vi\u1ebft b\u1edfi\" \/>\n\t<meta name=\"twitter:data1\" content=\"M\u1ef9 Duy\u00ean\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u01af\u1edbc t\u00ednh th\u1eddi gian \u0111\u1ecdc\" \/>\n\t<meta name=\"twitter:data2\" content=\"86 ph\u00fat\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Top 30+ c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NoSQL th\u01b0\u1eddng g\u1eb7p nh\u1ea5t - 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