{"id":73,"date":"2026-04-05T02:39:36","date_gmt":"2026-04-05T02:39:36","guid":{"rendered":"https:\/\/www.we-notes.com\/vn\/building-resilient-erd-distributed-systems\/"},"modified":"2026-04-05T02:39:36","modified_gmt":"2026-04-05T02:39:36","slug":"building-resilient-erd-distributed-systems","status":"publish","type":"post","link":"https:\/\/www.we-notes.com\/vn\/building-resilient-erd-distributed-systems\/","title":{"rendered":"X\u00e2y d\u1ef1ng c\u00e1c s\u01a1 \u0111\u1ed3 ER b\u1ec1n b\u1ec9: Chi\u1ebfn l\u01b0\u1ee3c ng\u0103n ng\u1eeba c\u00e1c s\u1ef1 c\u1ed1 lan truy\u1ec1n trong c\u00e1c h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n"},"content":{"rendered":"

Trong h\u1ea1 t\u1ea7ng hi\u1ec7n \u0111\u1ea1i, d\u1eef li\u1ec7u kh\u00f4ng ch\u1ec9 \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef m\u00e0 c\u00f2n \u0111ang l\u01b0u th\u00f4ng. Ki\u1ebfn tr\u00fac l\u01b0\u1ee3c \u0111\u1ed3 c\u01a1 s\u1edf d\u1eef li\u1ec7u c\u1ee7a b\u1ea1n tr\u1ef1c ti\u1ebfp \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh c\u1ee7a to\u00e0n b\u1ed9 h\u1ec7 sinh th\u00e1i ph\u00e2n t\u00e1n. Khi m\u1ed9t s\u01a1 \u0111\u1ed3 quan h\u1ec7 th\u1ef1c th\u1ec3 (ERD) \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf m\u00e0 kh\u00f4ng t\u00ednh \u0111\u1ebfn nh\u1eefng chi ti\u1ebft tinh t\u1ebf c\u1ee7a t\u00ednh to\u00e1n ph\u00e2n t\u00e1n, k\u1ebft qu\u1ea3 th\u01b0\u1eddng l\u00e0 d\u1ec5 g\u00e3y. M\u1ed9t s\u1ef1 c\u1ed1 \u1edf m\u1ed9t n\u00fat c\u00f3 th\u1ec3 lan r\u1ed9ng ra ngo\u00e0i, g\u00e2y ra th\u1eddi gian ng\u1eebng ho\u1ea1t \u0111\u1ed9ng r\u1ed9ng r\u00e3i ho\u1eb7c h\u1ecfng d\u1eef li\u1ec7u. H\u01b0\u1edbng d\u1eabn n\u00e0y kh\u00e1m ph\u00e1 c\u00e1ch x\u00e2y d\u1ef1ng c\u00e1c m\u00f4 h\u00ecnh d\u1eef li\u1ec7u c\u00f3 th\u1ec3 ch\u1ecbu \u0111\u1ef1ng \u0111\u01b0\u1ee3c s\u1ef1 b\u1ea5t \u1ed5n v\u1ed1n c\u00f3 trong m\u00f4i tr\u01b0\u1eddng ph\u00e2n t\u00e1n.<\/p>\n

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\"Hand-drawn<\/figure>\n<\/div>\n

\ud83e\udde9 Hi\u1ec3u r\u00f5 m\u1ed1i li\u00ean h\u1ec7 gi\u1eefa l\u01b0\u1ee3c \u0111\u1ed3 v\u00e0 \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh<\/h2>\n

S\u01a1 \u0111\u1ed3 ER \u0111\u00f3ng vai tr\u00f2 nh\u01b0 b\u1ea3n v\u1ebd thi\u1ebft k\u1ebf cho c\u00e1ch d\u1eef li\u1ec7u li\u00ean k\u1ebft v\u1edbi nhau. Trong c\u1ea5u h\u00ecnh \u0111\u01a1n th\u1ec3, c\u00e1c m\u1ed1i quan h\u1ec7 n\u00e0y \u0111\u01b0\u1ee3c qu\u1ea3n l\u00fd ch\u1eb7t ch\u1ebd trong m\u1ed9t ranh gi\u1edbi giao d\u1ecbch duy nh\u1ea5t. Tuy nhi\u00ean, c\u00e1c h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n ph\u00e1 v\u1ee1 nh\u1eefng ranh gi\u1edbi n\u00e0y. C\u00e1c d\u1ecbch v\u1ee5 ho\u1ea1t \u0111\u1ed9ng \u0111\u1ed9c l\u1eadp, th\u01b0\u1eddng s\u1edf h\u1eefu c\u00e1c kho d\u1eef li\u1ec7u ri\u00eang c\u1ee7a ch\u00fang. Khi b\u1ea1n k\u1ebft n\u1ed1i c\u00e1c d\u1ecbch v\u1ee5 n\u00e0y th\u00f4ng qua c\u00e1c m\u00f4 h\u00ecnh d\u1eef li\u1ec7u chung, b\u1ea1n s\u1ebd t\u1ea1o ra s\u1ef1 ph\u1ee5 thu\u1ed9c l\u1eabn nhau.<\/p>\n

Kh\u1ea3 n\u0103ng ph\u1ee5c h\u1ed3i trong b\u1ed1i c\u1ea3nh n\u00e0y c\u00f3 ngh\u0129a l\u00e0 thi\u1ebft k\u1ebf c\u00e1c l\u01b0\u1ee3c \u0111\u1ed3 cho ph\u00e9p m\u1ed9t ph\u1ea7n h\u1ec7 th\u1ed1ng b\u1ecb l\u1ed7i m\u00e0 kh\u00f4ng l\u00e0m s\u1eadp to\u00e0n b\u1ed9 h\u1ec7 th\u1ed1ng. \u0110i\u1ec1u n\u00e0y \u0111\u00f2i h\u1ecfi s\u1ef1 thay \u0111\u1ed5i trong c\u00e1ch nh\u00ecn nh\u1eadn: s\u01a1 \u0111\u1ed3 ER kh\u00f4ng c\u00f2n ch\u1ec9 l\u00e0 h\u00ecnh \u1ea3nh minh h\u1ecda v\u1ec1 c\u1ea5u tr\u00fac n\u1eefa; m\u00e0 l\u00e0 m\u1ed9t h\u1ee3p \u0111\u1ed3ng v\u1ec1 h\u00e0nh vi. N\u1ebfu r\u00e0ng bu\u1ed9c kh\u00f3a ngo\u1ea1i \u0111\u01b0\u1ee3c th\u1ef1c thi nghi\u00eam ng\u1eb7t qua m\u1ea1ng, m\u1ed9t s\u1ef1 ng\u1eaft k\u1ebft n\u1ed1i m\u1ea1ng t\u1ea1m th\u1eddi c\u00f3 th\u1ec3 g\u00e2y ra m\u1ed9t chu\u1ed7i l\u1ed7i lan truy\u1ec1n. Do \u0111\u00f3, thi\u1ebft k\u1ebf ph\u1ea3i t\u00ednh \u0111\u1ebfn s\u1ef1 nh\u1ea5t qu\u00e1n cu\u1ed1i c\u00f9ng, \u0111\u1ed9 tr\u1ec5 v\u00e0 c\u00e1c l\u1ed7i m\u1ed9t ph\u1ea7n.<\/p>\n

\ud83d\udd11 Nh\u1eefng kh\u00e1i ni\u1ec7m ch\u00ednh c\u1ea7n xem x\u00e9t<\/h3>\n
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  • T\u00ednh ph\u1ee5 thu\u1ed9c:<\/strong>T\u00ednh ph\u1ee5 thu\u1ed9c cao gi\u1eefa c\u00e1c th\u1ef1c th\u1ec3 c\u00f3 ngh\u0129a l\u00e0 thay \u0111\u1ed5i ho\u1eb7c l\u1ed7i \u1edf m\u1ed9t th\u1ef1c th\u1ec3 s\u1ebd \u1ea3nh h\u01b0\u1edfng \u0111\u00e1ng k\u1ec3 \u0111\u1ebfn th\u1ef1c th\u1ec3 kia.<\/li>\n
  • T\u00ednh nh\u1ea5t qu\u00e1n:<\/strong>T\u00ednh nh\u1ea5t qu\u00e1n m\u1ea1nh (ACID) \u0111\u1ea3m b\u1ea3o d\u1eef li\u1ec7u \u0111\u00fang nh\u01b0ng c\u00f3 th\u1ec3 l\u00e0m gi\u1ea3m kh\u1ea3 n\u0103ng s\u1eb5n s\u00e0ng khi x\u1ea3y ra s\u1ef1 c\u1ed1 m\u1ea1ng.<\/li>\n
  • Kh\u1ea3 n\u0103ng s\u1eb5n s\u00e0ng:<\/strong>Kh\u1ea3 n\u0103ng s\u1eb5n s\u00e0ng cao \u01b0u ti\u00ean th\u1eddi gian ho\u1ea1t \u0111\u1ed9ng, th\u01b0\u1eddng y\u00eau c\u1ea7u c\u00e1c quy t\u1eafc nh\u1ea5t qu\u00e1n l\u1ecfng l\u1ebbo h\u01a1n.<\/li>\n
  • Quy\u1ec1n s\u1edf h\u1eefu d\u1eef li\u1ec7u:<\/strong>C\u00e1c ranh gi\u1edbi r\u00f5 r\u00e0ng v\u1ec1 d\u1ecbch v\u1ee5 n\u00e0o s\u1edf h\u1eefu d\u1eef li\u1ec7u n\u00e0o gi\u00fap ng\u0103n ch\u1eb7n c\u00e1c ph\u1ee5 thu\u1ed9c v\u00f2ng tr\u00f2n.<\/li>\n<\/ul>\n

    \ud83d\udee1\ufe0f Chi\u1ebfn l\u01b0\u1ee3c m\u00f4 h\u00ecnh h\u00f3a m\u1ed1i quan h\u1ec7<\/h2>\n

    C\u00e1ch b\u1ea1n \u0111\u1ecbnh ngh\u0129a c\u00e1c m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c th\u1ef1c th\u1ec3 l\u00e0 y\u1ebfu t\u1ed1 ch\u00ednh th\u00fac \u0111\u1ea9y kh\u1ea3 n\u0103ng ph\u1ee5c h\u1ed3i. Trong m\u00f4i tr\u01b0\u1eddng ph\u00e2n t\u00e1n, m\u1ed7i m\u1ed1i quan h\u1ec7 \u0111\u1ec1u l\u00e0 m\u1ed9t cu\u1ed9c g\u1ecdi m\u1ea1ng ti\u1ec1m n\u0103ng. Vi\u1ec7c gi\u1ea3m thi\u1ec3u c\u00e1c cu\u1ed9c g\u1ecdi n\u00e0y v\u00e0 x\u1eed l\u00fd c\u00e1c ch\u1ebf \u0111\u1ed9 l\u1ed7i l\u00e0 \u0111i\u1ec1u then ch\u1ed1t.<\/p>\n

    1. Tr\u00e1nh c\u00e1c chu\u1ed7i n\u1ed1i s\u00e2u<\/h3>\n

    C\u00e1c l\u01b0\u1ee3c \u0111\u1ed3 \u0111\u01b0\u1ee3c chu\u1ea9n h\u00f3a s\u00e2u r\u1ea5t t\u1ed1t cho t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u nh\u01b0ng c\u00f3 th\u1ec3 g\u00e2y th\u1ea3m h\u1ecda v\u1ec1 hi\u1ec7u su\u1ea5t trong c\u00e1c h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n. M\u1ed9t truy v\u1ea5n \u0111\u01a1n l\u1ebb y\u00eau c\u1ea7u n\u0103m ph\u00e9p n\u1ed1i qua c\u00e1c d\u1ecbch v\u1ee5 kh\u00e1c nhau c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn th\u1eddi gian ch\u1edd qu\u00e1 l\u00e2u v\u00e0 c\u00e1c s\u1ef1 c\u1ed1 lan truy\u1ec1n. Thay v\u00e0o \u0111\u00f3, h\u00e3y c\u00e2n nh\u1eafc vi\u1ec7c phi chu\u1ea9n h\u00f3a khi \u0111i\u1ec1u \u0111\u00f3 gi\u00fap gi\u1ea3m nhu c\u1ea7u truy v\u1ea5n \u0111\u1ed3ng b\u1ed9 gi\u1eefa c\u00e1c d\u1ecbch v\u1ee5.<\/p>\n

      \n
    • Sao ch\u00e9p d\u1eef li\u1ec7u \u0111\u1ecdc:<\/strong>L\u01b0u tr\u1eef d\u1eef li\u1ec7u th\u01b0\u1eddng xuy\u00ean truy c\u1eadp m\u1ed9t c\u00e1ch d\u01b0 th\u1eeba \u0111\u1ec3 tr\u00e1nh c\u00e1c cu\u1ed9c g\u1ecdi t\u1eeb xa.<\/li>\n
    • Phi chu\u1ea9n h\u00f3a cho c\u00e1c \u0111\u01b0\u1eddng d\u1eabn \u0111\u1ecdc:<\/strong>Ch\u1ea5p nh\u1eadn \u0111\u1ed9 ph\u1ee9c t\u1ea1p khi ghi \u0111\u1ec3 \u0111\u1ed5i l\u1ea5y t\u1ed1c \u0111\u1ed9 v\u00e0 \u0111\u1ed9 tin c\u1eady khi \u0111\u1ecdc.<\/li>\n
    • D\u00f9ng b\u1ed9 nh\u1edb \u0111\u1ec7m cho c\u00e1c t\u1ed5ng h\u1ee3p:<\/strong>T\u00ednh to\u00e1n tr\u01b0\u1edbc c\u00e1c t\u1ed5ng ho\u1eb7c t\u00f3m t\u1eaft \u0111\u1ec3 gi\u1ea3m t\u1ea3i x\u1eed l\u00fd th\u1eddi gian th\u1ef1c.<\/li>\n<\/ul>\n

      2. Kh\u00f3a ngo\u1ea1i nh\u01b0 m\u1ed9t h\u1ee3p \u0111\u1ed3ng, ch\u1ee9 kh\u00f4ng ph\u1ea3i l\u00e0 bi\u1ec7n ph\u00e1p c\u01b0\u1ee1ng ch\u1ebf<\/h3>\n

      Trong m\u1ed9t c\u01a1 s\u1edf d\u1eef li\u1ec7u duy nh\u1ea5t, kh\u00f3a ngo\u1ea1i ng\u0103n ch\u1eb7n c\u00e1c b\u1ea3n ghi b\u1ecb b\u1ecf r\u01a1i. Trong h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n, vi\u1ec7c th\u1ef1c thi \u0111i\u1ec1u n\u00e0y th\u00f4ng qua r\u00e0ng bu\u1ed9c c\u01a1 s\u1edf d\u1eef li\u1ec7u qua c\u00e1c ranh gi\u1edbi m\u1ea1ng l\u00e0 r\u1ee7i ro. N\u1ebfu D\u1ecbch v\u1ee5 A b\u1ecb l\u1ed7i, D\u1ecbch v\u1ee5 B kh\u00f4ng th\u1ec3 x\u00e1c minh m\u1ed1i quan h\u1ec7, c\u00f3 th\u1ec3 l\u00e0m ch\u1eb7n c\u00e1c thao t\u00e1c.<\/p>\n

      Th\u01b0\u1eddng an to\u00e0n h\u01a1n khi \u0111\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n tham chi\u1ebfu \u1edf c\u1ea5p \u0111\u1ed9 \u1ee9ng d\u1ee5ng b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng logic x\u00e1c th\u1ef1c ho\u1eb7c ki\u1ec3m tra t\u00ednh nh\u1ea5t qu\u00e1n cu\u1ed1i c\u00f9ng.<\/p>\n

        \n
      • Ki\u1ec3m tra \u1edf c\u1ea5p \u0111\u1ed9 \u1ee9ng d\u1ee5ng:<\/strong>X\u00e1c minh ID t\u1ed3n t\u1ea1i tr\u01b0\u1edbc khi ghi, nh\u01b0ng cho ph\u00e9p x\u1ea3y ra \u0111i\u1ec1u ki\u1ec7n c\u1ea1nh tranh.<\/li>\n
      • T\u00ednh nh\u1ea5t qu\u00e1n cu\u1ed1i c\u00f9ng:<\/strong>S\u1eed d\u1ee5ng c\u00e1c c\u00f4ng vi\u1ec7c n\u1ec1n \u0111\u1ec3 d\u1ecdn d\u1eb9p c\u00e1c b\u1ea3n ghi b\u1ecb b\u1ecf r\u01a1i thay v\u00ec ch\u1eb7n giao d\u1ecbch ch\u00ednh.<\/li>\n
      • C\u00e1c r\u00e0ng bu\u1ed9c m\u1ec1m:<\/strong>Xem c\u00e1c kh\u00f3a ngo\u1ea1i nh\u01b0 c\u00e1c li\u00ean k\u1ebft logic thay v\u00ec c\u00e1c kh\u00f3a c\u01a1 s\u1edf d\u1eef li\u1ec7u c\u1ee9ng nh\u1eafc.<\/li>\n<\/ul>\n

        \ud83d\uddc3\ufe0f Qu\u1ea3n l\u00fd c\u00e1c m\u00f4 h\u00ecnh nh\u1ea5t qu\u00e1n d\u1eef li\u1ec7u<\/h2>\n

        C\u00e1c h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n ph\u1ea3i v\u01b0\u1ee3t qua \u0111\u1ecbnh l\u00fd CAP. Vi\u1ec7c l\u1ef1a ch\u1ecdn m\u00f4 h\u00ecnh nh\u1ea5t qu\u00e1n ph\u00f9 h\u1ee3p cho c\u00e1c th\u1ef1c th\u1ec3 c\u1ee7a b\u1ea1n l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 ng\u0103n ng\u1eeba l\u1ed7i d\u1eef li\u1ec7u trong c\u00e1c t\u00ecnh hu\u1ed1ng s\u1ef1 c\u1ed1.<\/p>\n\n\n\n\n\n
        M\u00f4 h\u00ecnh nh\u1ea5t qu\u00e1n<\/th>\nTr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng<\/th>\nT\u00e1c \u0111\u1ed9ng \u0111\u1ebfn kh\u1ea3 n\u0103ng ph\u1ee5c h\u1ed3i<\/th>\n<\/tr>\n
        Nh\u1ea5t qu\u00e1n m\u1ea1nh<\/td>\nGiao d\u1ecbch t\u00e0i ch\u00ednh, \u0110\u1ebfm t\u1ed3n kho<\/td>\n\u0110\u1ed9 tin c\u1eady cao, kh\u1ea3 n\u0103ng s\u1eb5n s\u00e0ng th\u1ea5p trong c\u00e1c t\u00ecnh hu\u1ed1ng chia t\u00e1ch<\/td>\n<\/tr>\n
        Nh\u1ea5t qu\u00e1n cu\u1ed1i c\u00f9ng<\/td>\nH\u1ed3 s\u01a1 ng\u01b0\u1eddi d\u00f9ng, B\u1ea3n tin x\u00e3 h\u1ed9i, Nh\u1eadt k\u00fd<\/td>\nKh\u1ea3 n\u0103ng s\u1eb5n s\u00e0ng cao, s\u1ef1 ph\u00e2n k\u1ef3 d\u1eef li\u1ec7u t\u1ea1m th\u1eddi<\/td>\n<\/tr>\n
        \u0110\u1ecdc nh\u1eefng g\u00ec b\u1ea1n \u0111\u00e3 vi\u1ebft<\/td>\nD\u1eef li\u1ec7u phi\u00ean, Gi\u1ecf h\u00e0ng<\/td>\nTr\u1ea3i nghi\u1ec7m ng\u01b0\u1eddi d\u00f9ng c\u00e2n b\u1eb1ng v\u1edbi \u0111\u1ed9 ph\u1ee9c t\u1ea1p v\u1eeba ph\u1ea3i<\/td>\n<\/tr>\n<\/table>\n

        Khi thi\u1ebft k\u1ebf s\u01a1 \u0111\u1ed3 ERD c\u1ee7a b\u1ea1n, h\u00e3y ghi ch\u00fa nh\u1eefng th\u1ef1c th\u1ec3 n\u00e0o y\u00eau c\u1ea7u nh\u1ea5t qu\u00e1n m\u1ea1nh v\u00e0 th\u1ef1c th\u1ec3 n\u00e0o c\u00f3 th\u1ec3 ch\u1ea5p nh\u1eadn c\u1eadp nh\u1eadt cu\u1ed1i c\u00f9ng. S\u1ef1 ph\u00e2n bi\u1ec7t n\u00e0y s\u1ebd \u0111\u1ecbnh h\u01b0\u1edbng c\u00e1ch b\u1ea1n tri\u1ec3n khai c\u00e1c kh\u00f3a, giao d\u1ecbch v\u00e0 chi\u1ebfn l\u01b0\u1ee3c sao ch\u00e9p.<\/p>\n

        \ud83d\udd04 X\u1eed l\u00fd s\u1ef1 ti\u1ebfn h\u00f3a c\u1ee7a l\u01b0\u1ee3c \u0111\u1ed3<\/h2>\n

        H\u1ec7 th\u1ed1ng thay \u0111\u1ed5i. C\u00e1c tr\u01b0\u1eddng \u0111\u01b0\u1ee3c th\u00eam v\u00e0o, ki\u1ec3u d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c s\u1eeda \u0111\u1ed5i v\u00e0 c\u00e1c m\u1ed1i quan h\u1ec7 thay \u0111\u1ed5i. Trong ki\u1ebfn tr\u00fac ph\u00e2n t\u00e1n, b\u1ea1n kh\u00f4ng th\u1ec3 \u0111\u01a1n gi\u1ea3n thay \u0111\u1ed5i l\u01b0\u1ee3c \u0111\u1ed3 tr\u00ean t\u1ea5t c\u1ea3 c\u00e1c n\u00fat c\u00f9ng m\u1ed9t l\u00fac. S\u1ef1 kh\u00f4ng kh\u1edbp gi\u1eefa m\u1ed9t d\u1ecbch v\u1ee5 v\u00e0 phi\u00ean b\u1ea3n c\u01a1 s\u1edf d\u1eef li\u1ec7u c\u1ee7a n\u00f3 c\u00f3 th\u1ec3 g\u00e2y s\u1eadp h\u1ec7 th\u1ed1ng.<\/p>\n

        C\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t cho vi\u1ec7c qu\u1ea3n l\u00fd phi\u00ean b\u1ea3n<\/h3>\n
          \n
        • T\u00ednh t\u01b0\u01a1ng th\u00edch ng\u01b0\u1ee3c:<\/strong>C\u00e1c phi\u00ean b\u1ea3n l\u01b0\u1ee3c \u0111\u1ed3 m\u1edbi ph\u1ea3i c\u00f3 th\u1ec3 \u0111\u1ecdc \u0111\u01b0\u1ee3c b\u1edfi c\u00e1c phi\u00ean b\u1ea3n d\u1ecbch v\u1ee5 c\u0169.<\/li>\n
        • Th\u1eddi gian lo\u1ea1i b\u1ecf:<\/strong>Gi\u1eef c\u00e1c tr\u01b0\u1eddng c\u0169 trong c\u01a1 s\u1edf d\u1eef li\u1ec7u trong th\u1eddi gian d\u00e0i ngay c\u1ea3 khi ch\u00fang kh\u00f4ng c\u00f2n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng.<\/li>\n
        • C\u1edd t\u00ednh n\u0103ng:<\/strong>\u0110\u1eb7t c\u00e1c c\u1ea5u tr\u00fac d\u1eef li\u1ec7u m\u1edbi ph\u00eda sau c\u00e1c c\u1edd \u0111\u1ec3 ki\u1ec3m so\u00e1t vi\u1ec7c tri\u1ec3n khai.<\/li>\n
        • M\u1edf r\u1ed9ng v\u00e0 thu h\u1eb9p:<\/strong>Tr\u01b0\u1edbc ti\u00ean th\u00eam tr\u01b0\u1eddng m\u1edbi (m\u1edf r\u1ed9ng), di chuy\u1ec3n d\u1eef li\u1ec7u, sau \u0111\u00f3 x\u00f3a tr\u01b0\u1eddng c\u0169 (thu h\u1eb9p).<\/li>\n<\/ul>\n

          Vi\u1ec7c ghi ch\u00e9p nh\u1eefng thay \u0111\u1ed5i n\u00e0y trong s\u01a1 \u0111\u1ed3 ERD l\u00e0 thi\u1ebft y\u1ebfu. S\u1eed d\u1ee5ng ch\u00fa th\u00edch ho\u1eb7c c\u00e1c s\u01a1 \u0111\u1ed3 ri\u00eang bi\u1ec7t \u0111\u1ec3 th\u1ec3 hi\u1ec7n m\u1ed1i quan h\u1ec7 \u0111\u00e3 b\u1ecb lo\u1ea1i b\u1ecf so v\u1edbi c\u00e1c m\u1ed1i quan h\u1ec7 \u0111ang ho\u1ea1t \u0111\u1ed9ng. \u0110i\u1ec1u n\u00e0y ng\u0103n c\u1ea3n c\u00e1c k\u1ef9 s\u01b0 ph\u1ee5 thu\u1ed9c v\u00e0o c\u00e1c c\u1ea5u tr\u00fac l\u1ed7i th\u1eddi.<\/p>\n

          \ud83d\uded1 Ng\u0103n ch\u1eb7n c\u00e1c s\u1ef1 c\u1ed1 lan truy\u1ec1n<\/h2>\n

          M\u1ed9t s\u1ef1 c\u1ed1 lan truy\u1ec1n x\u1ea3y ra khi m\u1ed9t s\u1ef1 c\u1ed1 c\u1ee5c b\u1ed9 k\u00edch ho\u1ea1t m\u1ed9t ph\u1ea3n \u1ee9ng d\u00e2y chuy\u1ec1n \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn to\u00e0n b\u1ed9 h\u1ec7 th\u1ed1ng. Thi\u1ebft k\u1ebf d\u1eef li\u1ec7u \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c ki\u1ec3m so\u00e1t nh\u1eefng s\u1ef1 ki\u1ec7n n\u00e0y.<\/p>\n

          1. Ng\u1eaft m\u1ea1ch \u1edf l\u1edbp d\u1eef li\u1ec7u<\/h3>\n

          Gi\u1ed1ng nh\u01b0 b\u1ea1n tri\u1ec3n khai b\u1ed9 ng\u1eaft m\u1ea1ch trong c\u00e1c l\u1eddi g\u1ecdi d\u1ecbch v\u1ee5, b\u1ea1n n\u00ean thi\u1ebft k\u1ebf l\u1edbp d\u1eef li\u1ec7u \u0111\u1ec3 x\u1eed l\u00fd th\u1eddi gian ch\u1edd m\u1ed9t c\u00e1ch tr\u01a1n tru. N\u1ebfu m\u1ed9t truy v\u1ea5n \u0111\u1ecdc b\u1ecb treo, h\u1ec7 th\u1ed1ng kh\u00f4ng n\u00ean ch\u1edd \u0111\u1ee3i v\u00f4 h\u1ea1n.<\/p>\n

            \n
          • \u0110\u1eb7t th\u1eddi gian ch\u1edd:<\/strong> X\u00e1c \u0111\u1ecbnh c\u00e1c kho\u1ea3ng th\u1eddi gian t\u1ed1i \u0111a nghi\u00eam ng\u1eb7t cho c\u00e1c giao d\u1ecbch c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/li>\n
          • Gi\u00e1 tr\u1ecb d\u1ef1 ph\u00f2ng:<\/strong> N\u1ebfu d\u1eef li\u1ec7u kh\u00f4ng th\u1ec3 truy xu\u1ea5t \u0111\u01b0\u1ee3c, h\u00e3y tr\u1ea3 v\u1ec1 m\u1ed9t gi\u00e1 tr\u1ecb m\u1eb7c \u0111\u1ecbnh an to\u00e0n ho\u1eb7c gi\u00e1 tr\u1ecb \u0111\u00e3 \u0111\u01b0\u1ee3c l\u01b0u t\u1ea1m.<\/li>\n
          • H\u1ea1n ch\u1ebf t\u1ed1c \u0111\u1ed9:<\/strong> Ng\u0103n ch\u1eb7n m\u1ed9t truy v\u1ea5n n\u1eb7ng duy nh\u1ea5t ti\u00eau th\u1ee5 to\u00e0n b\u1ed9 t\u00e0i nguy\u00ean c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/li>\n<\/ul>\n

            2. C\u00e1ch ly d\u1eef li\u1ec7u quan tr\u1ecdng<\/h3>\n

            T\u00e1ch bi\u1ec7t d\u1eef li\u1ec7u quan tr\u1ecdng kh\u1ecfi d\u1eef li\u1ec7u kh\u00f4ng quan tr\u1ecdng. N\u1ebfu d\u1ecbch v\u1ee5 h\u1ed3 s\u01a1 ng\u01b0\u1eddi d\u00f9ng th\u1ea5t b\u1ea1i, n\u00f3 kh\u00f4ng n\u00ean \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn d\u1ecbch v\u1ee5 x\u1eed l\u00fd thanh to\u00e1n. S\u1ef1 t\u00e1ch bi\u1ec7t n\u00e0y \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n trong s\u01a1 \u0111\u1ed3 ERD c\u1ee7a b\u1ea1n b\u1eb1ng c\u00e1c l\u01b0\u1ee3c \u0111\u1ed3 ri\u00eang bi\u1ec7t ho\u1eb7c c\u00e1c c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u1eadt l\u00fd ri\u00eang bi\u1ec7t.<\/p>\n

              \n
            • Chia nh\u1ecf c\u01a1 s\u1edf d\u1eef li\u1ec7u:<\/strong> Chia d\u1eef li\u1ec7u tr\u00ean nhi\u1ec1u m\u00e1y ch\u1ee7 \u0111\u1ec3 gi\u1edbi h\u1ea1n ph\u1ea1m vi \u1ea3nh h\u01b0\u1edfng.<\/li>\n
            • V\u00f9ng bi\u00ean c\u01a1 s\u1edf d\u1eef li\u1ec7u d\u1ecbch v\u1ee5:<\/strong> M\u1ed7i d\u1ecbch v\u1ee5 vi m\u00f4 s\u1edf h\u1eefu c\u01a1 s\u1edf d\u1eef li\u1ec7u c\u1ee7a ri\u00eang n\u00f3 m\u1ed9t c\u00e1ch \u0111\u1ed9c quy\u1ec1n.<\/li>\n
            • T\u00e1ch bi\u1ec7t \u0111\u1ecdc\/ghi:<\/strong> S\u1eed d\u1ee5ng c\u00e1c k\u1ebft n\u1ed1i ri\u00eang bi\u1ec7t cho c\u00f4ng vi\u1ec7c b\u00e1o c\u00e1o v\u00e0 giao d\u1ecbch.<\/li>\n<\/ul>\n

              \ud83d\udcc9 X\u00f3a m\u1ec1m so v\u1edbi x\u00f3a c\u1ee9ng<\/h2>\n

              Trong c\u00e1c h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n, vi\u1ec7c x\u00f3a c\u1ee9ng l\u00e0 r\u1ee7i ro. N\u1ebfu m\u1ed9t d\u1ecbch v\u1ee5 x\u00f3a m\u1ed9t b\u1ea3n ghi v\u00e0 d\u1ecbch v\u1ee5 kh\u00e1c mong \u0111\u1ee3i n\u00f3, d\u1ecbch v\u1ee5 th\u1ee9 hai s\u1ebd s\u1eadp ho\u1eb7c t\u1ea1o ra l\u1ed7i. X\u00f3a m\u1ec1m cung c\u1ea5p m\u1ed9t l\u1edbp an to\u00e0n.<\/p>\n

              Thay v\u00ec x\u00f3a m\u1ed9t h\u00e0ng, \u0111\u00e1nh d\u1ea5u n\u00f3 l\u00e0 \u0111\u00e3 x\u00f3a b\u1eb1ng th\u1eddi gian \u0111\u00e1nh d\u1ea5u ho\u1eb7c c\u1edd. \u0110i\u1ec1u n\u00e0y b\u1ea3o to\u00e0n t\u00ednh to\u00e0n v\u1eb9n tham chi\u1ebfu cho m\u1ee5c \u0111\u00edch ki\u1ec3m to\u00e1n v\u00e0 b\u00e1o c\u00e1o, \u0111\u1ed3ng th\u1eddi cho bi\u1ebft d\u1eef li\u1ec7u kh\u00f4ng c\u00f2n ho\u1ea1t \u0111\u1ed9ng.<\/p>\n

                \n
              • D\u1ea5u v\u1ebft ki\u1ec3m to\u00e1n:<\/strong> Gi\u1eef l\u1ea1i d\u1eef li\u1ec7u l\u1ecbch s\u1eed \u0111\u1ec3 tu\u00e2n th\u1ee7 v\u00e0 g\u1ee1 l\u1ed7i.<\/li>\n
              • Kh\u00f4i ph\u1ee5c:<\/strong> C\u00e1c thao t\u00e1c x\u00f3a nh\u1ea7m c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c kh\u00f4i ph\u1ee5c m\u1ed9t c\u00e1ch d\u1ec5 d\u00e0ng.<\/li>\n
              • Hi\u1ec7u su\u1ea5t:<\/strong> Tr\u00e1nh chi ph\u00ed ph\u00e1t sinh khi x\u00f3a c\u00e1c h\u00e0ng kh\u1ecfi ch\u1ec9 m\u1ee5c, m\u1eb7c d\u00f9 \u0111i\u1ec1u n\u00e0y l\u00e0m t\u0103ng nhu c\u1ea7u l\u01b0u tr\u1eef.<\/li>\n<\/ul>\n

                \ud83d\udd0d Kh\u1ea3 n\u0103ng quan s\u00e1t trong thi\u1ebft k\u1ebf d\u1eef li\u1ec7u<\/h2>\n

                Kh\u1ea3 n\u0103ng ph\u1ee5c h\u1ed3i kh\u00f4ng ch\u1ec9 l\u00e0 v\u1ec1 ph\u00f2ng ng\u1eeba; m\u00e0 c\u00f2n l\u00e0 v\u1ec1 ph\u00e1t hi\u1ec7n. S\u01a1 \u0111\u1ed3 ERD c\u1ee7a b\u1ea1n n\u00ean bao g\u1ed3m c\u00e1c tr\u01b0\u1eddng h\u1ed7 tr\u1ee3 gi\u00e1m s\u00e1t v\u00e0 g\u1ee1 l\u1ed7i.<\/p>\n

                  \n
                • M\u00e3 li\u00ean k\u1ebft:<\/strong>Th\u00eam m\u1ed9t ID duy nh\u1ea5t \u0111i k\u00e8m theo t\u1ea5t c\u1ea3 c\u00e1c th\u1ef1c th\u1ec3 li\u00ean quan \u0111\u1ec3 truy v\u1ebft m\u1ed9t y\u00eau c\u1ea7u.<\/li>\n
                • C\u00e1c b\u1ed9 phi\u00ean b\u1ea3n:<\/strong>L\u01b0u s\u1ed1 phi\u00ean b\u1ea3n \u0111\u1ec3 ph\u00e1t hi\u1ec7n s\u1ef1 l\u1ec7ch chu\u1ea9n c\u1ea5u tr\u00fac.<\/li>\n
                • C\u1edd tr\u1ea1ng th\u00e1i:<\/strong>Ghi ch\u00fa r\u00f5 r\u00e0ng c\u00e1c b\u1ea3n ghi l\u00e0 \u0111ang ch\u1edd x\u1eed l\u00fd, \u0111ang ho\u1ea1t \u0111\u1ed9ng ho\u1eb7c th\u1ea5t b\u1ea1i \u0111\u1ec3 h\u1ed7 tr\u1ee3 kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1.<\/li>\n<\/ul>\n

                  \ud83d\udcca So s\u00e1nh c\u00e1c m\u1eabu thi\u1ebft k\u1ebf<\/h2>\n\n\n\n\n\n
                  M\u1eabu<\/th>\n\u01afu \u0111i\u1ec3m<\/th>\nNh\u01b0\u1ee3c \u0111i\u1ec3m<\/th>\n<\/tr>\n
                  C\u01a1 s\u1edf d\u1eef li\u1ec7u t\u1eadp trung<\/td>\nM\u1ed1i quan h\u1ec7 \u0111\u01a1n gi\u1ea3n, d\u1ec5 duy tr\u00ec t\u00ednh nh\u1ea5t qu\u00e1n<\/td>\n\u0110i\u1ec3m l\u1ed7i duy nh\u1ea5t, gi\u1edbi h\u1ea1n kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng<\/td>\n<\/tr>\n
                  C\u01a1 s\u1edf d\u1eef li\u1ec7u cho t\u1eebng d\u1ecbch v\u1ee5<\/td>\nT\u00e1ch bi\u1ec7t, m\u1edf r\u1ed9ng \u0111\u1ed9c l\u1eadp<\/td>\nGiao d\u1ecbch ph\u1ee9c t\u1ea1p, nh\u1ea5t qu\u00e1n cu\u1ed1i c\u00f9ng<\/td>\n<\/tr>\n
                  C\u1ea5u tr\u00fac chung<\/td>\nD\u1ec5 d\u00e0ng k\u1ebft h\u1ee3p, t\u1ea7m nh\u00ecn th\u1ed1ng nh\u1ea5t<\/td>\nLi\u00ean k\u1ebft ch\u1eb7t ch\u1ebd, ph\u1ed1i h\u1ee3p tri\u1ec3n khai<\/td>\n<\/tr>\n<\/table>\n

                  \ud83e\uddea Ki\u1ec3m th\u1eed thi\u1ebft k\u1ebf c\u1ee7a b\u1ea1n<\/h2>\n

                  Sau khi s\u01a1 \u0111\u1ed3 ERD \u0111\u01b0\u1ee3c ph\u00e1c th\u1ea3o, h\u00e3y ki\u1ec3m th\u1eed n\u00f3 trong \u0111i\u1ec1u ki\u1ec7n l\u1ed7i. \u0110\u1eebng cho r\u1eb1ng m\u00f4 h\u00ecnh s\u1ebd ch\u1ecbu \u0111\u01b0\u1ee3c. M\u00f4 ph\u1ecfng c\u00e1c t\u00ecnh hu\u1ed1ng chia t\u00e1ch m\u1ea1ng v\u00e0 s\u1ef1 c\u1ed1 c\u01a1 s\u1edf d\u1eef li\u1ec7u \u0111\u1ec3 xem c\u00e1c m\u1ed1i quan h\u1ec7 ph\u1ea3n \u1ee9ng th\u1ebf n\u00e0o.<\/p>\n

                    \n
                  • K\u1ef9 thu\u1eadt h\u1ed7n lo\u1ea1n:<\/strong>Ti\u00eam l\u1ed7i v\u00e0o c\u00e1c n\u00fat d\u1eef li\u1ec7u \u0111\u1ec3 quan s\u00e1t qu\u00e1 tr\u00ecnh ph\u1ee5c h\u1ed3i.<\/li>\n
                  • Ki\u1ec3m th\u1eed t\u1ea3i:<\/strong>Th\u1eed th\u00e1ch h\u1ec7 th\u1ed1ng \u0111\u1ec3 xem c\u00e1c m\u1ed1i quan h\u1ec7 c\u00f3 b\u1ecb ph\u00e1 v\u1ee1 d\u01b0\u1edbi \u00e1p l\u1ef1c hay kh\u00f4ng.<\/li>\n
                  • Ki\u1ec3m th\u1eed h\u1ee3p \u0111\u1ed3ng:<\/strong>X\u00e1c minh r\u1eb1ng \u0111\u1ecbnh d\u1ea1ng d\u1eef li\u1ec7u kh\u1edbp nhau gi\u1eefa c\u00e1c d\u1ecbch v\u1ee5.<\/li>\n<\/ul>\n

                    \ud83d\udcdd Nh\u1eefng suy ngh\u0129 cu\u1ed1i c\u00f9ng v\u1ec1 ki\u1ebfn tr\u00fac d\u1eef li\u1ec7u<\/h2>\n

                    X\u00e2y d\u1ef1ng h\u1ec7 th\u1ed1ng b\u1ec1n b\u1ec9 \u0111\u00f2i h\u1ecfi ph\u1ea3i th\u1eeba nh\u1eadn r\u1eb1ng s\u1ef1 c\u1ed1 l\u00e0 \u0111i\u1ec1u kh\u00f4ng th\u1ec3 tr\u00e1nh kh\u1ecfi. S\u01a1 \u0111\u1ed3 ER c\u1ee7a b\u1ea1n l\u00e0 tuy\u1ebfn ph\u00f2ng th\u1ee7 \u0111\u1ea7u ti\u00ean ch\u1ed1ng l\u1ea1i h\u1ed7n lo\u1ea1n. B\u1eb1ng c\u00e1ch \u01b0u ti\u00ean t\u00e1ch bi\u1ec7t, qu\u1ea3n l\u00fd t\u00ednh nh\u1ea5t qu\u00e1n m\u1ed9t c\u00e1ch r\u00f5 r\u00e0ng v\u00e0 l\u00ean k\u1ebf ho\u1ea1ch cho s\u1ef1 ph\u00e1t tri\u1ec3n, b\u1ea1n s\u1ebd t\u1ea1o n\u00ean n\u1ec1n t\u1ea3ng h\u1ed7 tr\u1ee3 s\u1ef1 \u1ed5n \u0111\u1ecbnh l\u00e2u d\u00e0i. M\u1ee5c ti\u00eau kh\u00f4ng ph\u1ea3i l\u00e0 ho\u00e0n h\u1ea3o, m\u00e0 l\u00e0 suy gi\u1ea3m m\u1ed9t c\u00e1ch tr\u01a1n tru. Khi c\u00e1c th\u00e0nh ph\u1ea7n g\u1eb7p s\u1ef1 c\u1ed1, l\u1edbp d\u1eef li\u1ec7u c\u1ea7n b\u1ea3o v\u1ec7 logic kinh doanh kh\u1ecfi s\u1ee5p \u0111\u1ed5 ho\u00e0n to\u00e0n.<\/p>\n

                    \u00c1p d\u1ee5ng c\u00e1c chi\u1ebfn l\u01b0\u1ee3c n\u00e0y \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o m\u00f4 h\u00ecnh d\u1eef li\u1ec7u c\u1ee7a b\u1ea1n \u0111\u00f3ng g\u00f3p v\u00e0o h\u1ea1 t\u1ea7ng v\u1eefng ch\u1eafc. Vi\u1ec7c xem x\u00e9t li\u00ean t\u1ee5c c\u1ea5u tr\u00fac d\u1eef li\u1ec7u c\u1ee7a b\u1ea1n tr\u01b0\u1edbc c\u00e1c m\u1eabu s\u1ef1 c\u1ed1 th\u1ef1c t\u1ebf s\u1ebd gi\u00fap h\u1ec7 th\u1ed1ng c\u1ee7a b\u1ea1n lu\u00f4n kh\u1ecfe m\u1ea1nh v\u00e0 ph\u1ea3n h\u1ed3i t\u1ed1t.<\/p>\n","protected":false},"excerpt":{"rendered":"

                    Trong h\u1ea1 t\u1ea7ng hi\u1ec7n \u0111\u1ea1i, d\u1eef li\u1ec7u kh\u00f4ng ch\u1ec9 \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef m\u00e0 c\u00f2n \u0111ang l\u01b0u th\u00f4ng. Ki\u1ebfn tr\u00fac l\u01b0\u1ee3c \u0111\u1ed3 c\u01a1 s\u1edf d\u1eef li\u1ec7u c\u1ee7a b\u1ea1n tr\u1ef1c ti\u1ebfp \u1ea3nh…<\/p>\n","protected":false},"author":1,"featured_media":74,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"S\u01a1 \u0111\u1ed3 ER b\u1ec1n b\u1ec9: Ng\u0103n ng\u1eeba s\u1ef1 c\u1ed1 trong h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n","_yoast_wpseo_metadesc":"H\u1ecdc c\u00e1c chi\u1ebfn l\u01b0\u1ee3c \u0111\u1ec3 x\u00e2y d\u1ef1ng c\u00e1c s\u01a1 \u0111\u1ed3 ER b\u1ec1n b\u1ec9, ng\u0103n ng\u1eeba c\u00e1c s\u1ef1 c\u1ed1 lan truy\u1ec1n trong c\u00e1c h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n. 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