{"id":476742,"date":"2023-08-09T07:35:16","date_gmt":"2023-08-09T07:35:16","guid":{"rendered":""},"modified":"2023-09-05T11:13:20","modified_gmt":"2023-09-05T11:13:20","slug":"database-transaction","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/vn\/wiki\/database-transaction\/","title":{"rendered":"Giao d\u1ecbch c\u01a1 s\u1edf d\u1eef li\u1ec7u"},"content":{"rendered":"<p>Giao d\u1ecbch c\u01a1 s\u1edf d\u1eef li\u1ec7u l\u00e0 th\u00e0nh ph\u1ea7n thi\u1ebft y\u1ebfu c\u1ee7a m\u00f4i tr\u01b0\u1eddng \u0111i\u1ec7n to\u00e1n hi\u1ec7n \u0111\u1ea1i, \u0111\u1ea1i di\u1ec7n cho m\u1ed9t \u0111\u01a1n v\u1ecb c\u00f4ng vi\u1ec7c \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n trong h\u1ec7 th\u1ed1ng qu\u1ea3n l\u00fd c\u01a1 s\u1edf d\u1eef li\u1ec7u (DBMS) ho\u1eb7c h\u1ec7 th\u1ed1ng t\u01b0\u01a1ng t\u1ef1, \u0111\u01b0\u1ee3c x\u1eed l\u00fd m\u1ed9t c\u00e1ch m\u1ea1ch l\u1ea1c v\u00e0 \u0111\u00e1ng tin c\u1eady, \u0111\u1ed9c l\u1eadp v\u1edbi c\u00e1c giao d\u1ecbch kh\u00e1c.<\/p>\n<h2>Ngu\u1ed3n g\u1ed1c v\u00e0 nh\u1eefng \u0111\u1ec1 c\u1eadp ban \u0111\u1ea7u v\u1ec1 giao d\u1ecbch c\u01a1 s\u1edf d\u1eef li\u1ec7u<\/h2>\n<p>Kh\u00e1i ni\u1ec7m giao d\u1ecbch trong b\u1ed1i c\u1ea3nh c\u01a1 s\u1edf d\u1eef li\u1ec7u l\u1ea7n \u0111\u1ea7u ti\u00ean \u0111\u01b0\u1ee3c gi\u1edbi thi\u1ec7u v\u00e0o nh\u1eefng n\u0103m 1960 v\u1edbi s\u1ef1 ra \u0111\u1eddi c\u1ee7a h\u1ec7 th\u1ed1ng qu\u1ea3n l\u00fd c\u01a1 s\u1edf d\u1eef li\u1ec7u. System R c\u1ee7a IBM, m\u1ed9t trong nh\u1eefng h\u1ec7 th\u1ed1ng \u0111\u1ea7u ti\u00ean tri\u1ec3n khai ng\u00f4n ng\u1eef SQL, th\u01b0\u1eddng \u0111\u01b0\u1ee3c ghi nh\u1eadn l\u00e0 \u0111\u00e3 ph\u00e1t tri\u1ec3n v\u00e0 ph\u1ed5 bi\u1ebfn kh\u00e1i ni\u1ec7m giao d\u1ecbch nguy\u00ean t\u1eed v\u00e0o nh\u1eefng n\u0103m 1970.<\/p>\n<p>Giao d\u1ecbch c\u01a1 s\u1edf d\u1eef li\u1ec7u, nh\u01b0 ch\u00fang ta bi\u1ebft ng\u00e0y nay, \u0111\u00e3 \u0111\u01b0\u1ee3c c\u1ea3i ti\u1ebfn th\u00eam trong m\u1ed9t b\u00e0i b\u00e1o chuy\u00ean \u0111\u1ec1 n\u0103m 1983 c\u1ee7a c\u00e1c nh\u00e0 khoa h\u1ecdc m\u00e1y t\u00ednh Jim Gray v\u00e0 Andreas Reuter, n\u01a1i h\u1ecd \u0111\u01b0a ra c\u00e1c thu\u1ed9c t\u00ednh ACID (T\u00ednh nguy\u00ean t\u1eed, T\u00ednh nh\u1ea5t qu\u00e1n, S\u1ef1 c\u00f4 l\u1eadp, \u0110\u1ed9 b\u1ec1n) \u0111\u1eb7c tr\u01b0ng cho m\u1ed9t giao d\u1ecbch \u0111\u00e1ng tin c\u1eady.<\/p>\n<h2>Giao d\u1ecbch c\u01a1 s\u1edf d\u1eef li\u1ec7u l\u00e0 g\u00ec?<\/h2>\n<p>Giao d\u1ecbch c\u01a1 s\u1edf d\u1eef li\u1ec7u l\u00e0 m\u1ed9t chu\u1ed7i g\u1ed3m m\u1ed9t ho\u1eb7c nhi\u1ec1u thao t\u00e1c \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n d\u01b0\u1edbi d\u1ea1ng m\u1ed9t \u0111\u01a1n v\u1ecb c\u00f4ng vi\u1ec7c logic duy nh\u1ea5t. N\u00f3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 cung c\u1ea5p \u0111\u1ed9 tin c\u1eady v\u00e0 t\u00ednh to\u00e0n v\u1eb9n cao h\u01a1n khi thao t\u00e1c d\u1eef li\u1ec7u trong c\u01a1 s\u1edf d\u1eef li\u1ec7u. C\u00e1c ho\u1ea1t \u0111\u1ed9ng c\u00f3 trong m\u1ed9t giao d\u1ecbch c\u00f3 th\u1ec3 bao g\u1ed3m t\u1eeb \u0111\u1ecdc d\u1eef li\u1ec7u (c\u00e2u l\u1ec7nh CH\u1eccN trong SQL) \u0111\u1ebfn s\u1eeda \u0111\u1ed5i d\u1eef li\u1ec7u hi\u1ec7n c\u00f3 (c\u00e2u l\u1ec7nh C\u1eacP NH\u1eacT ho\u1eb7c X\u00d3A) ho\u1eb7c ch\u00e8n d\u1eef li\u1ec7u m\u1edbi (c\u00e2u l\u1ec7nh INSERT).<\/p>\n<p>C\u00e1c giao d\u1ecbch trong m\u00f4i tr\u01b0\u1eddng c\u01a1 s\u1edf d\u1eef li\u1ec7u c\u00f3 hai m\u1ee5c \u0111\u00edch ch\u00ednh:<\/p>\n<ol>\n<li>\n<p>\u0110\u1ec3 cung c\u1ea5p c\u00e1c \u0111\u01a1n v\u1ecb c\u00f4ng vi\u1ec7c \u0111\u00e1ng tin c\u1eady cho ph\u00e9p kh\u00f4i ph\u1ee5c ch\u00ednh x\u00e1c sau c\u00e1c l\u1ed7i v\u00e0 gi\u1eef cho c\u01a1 s\u1edf d\u1eef li\u1ec7u nh\u1ea5t qu\u00e1n ngay c\u1ea3 trong tr\u01b0\u1eddng h\u1ee3p l\u1ed7i h\u1ec7 th\u1ed1ng, khi qu\u00e1 tr\u00ecnh th\u1ef1c thi d\u1eebng (ho\u00e0n to\u00e0n ho\u1eb7c m\u1ed9t ph\u1ea7n) v\u00e0 nhi\u1ec1u thao t\u00e1c tr\u00ean c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u1eabn ch\u01b0a ho\u00e0n th\u00e0nh, v\u1edbi tr\u1ea1ng th\u00e1i kh\u00f4ng r\u00f5 r\u00e0ng.<\/p>\n<\/li>\n<li>\n<p>\u0110\u1ec3 cung c\u1ea5p s\u1ef1 c\u00e1ch ly gi\u1eefa c\u00e1c ch\u01b0\u01a1ng tr\u00ecnh truy c\u1eadp c\u01a1 s\u1edf d\u1eef li\u1ec7u \u0111\u1ed3ng th\u1eddi. N\u1ebfu s\u1ef1 c\u00f4 l\u1eadp n\u00e0y kh\u00f4ng \u0111\u01b0\u1ee3c cung c\u1ea5p th\u00ec k\u1ebft qu\u1ea3 c\u1ee7a ch\u01b0\u01a1ng tr\u00ecnh c\u00f3 th\u1ec3 b\u1ecb sai.<\/p>\n<\/li>\n<\/ol>\n<h2>C\u1ea5u tr\u00fac b\u00ean trong v\u00e0 ch\u1ee9c n\u0103ng c\u1ee7a c\u00e1c giao d\u1ecbch c\u01a1 s\u1edf d\u1eef li\u1ec7u<\/h2>\n<p>M\u1ecdi giao d\u1ecbch c\u01a1 s\u1edf d\u1eef li\u1ec7u \u0111\u1ec1u tu\u00e2n theo c\u00e1c nguy\u00ean t\u1eafc ACID c\u01a1 b\u1ea3n:<\/p>\n<ol>\n<li>\n<p><strong>T\u00ednh nguy\u00ean t\u1eed:<\/strong> T\u00ednh nguy\u00ean t\u1eed \u0111\u1ea3m b\u1ea3o r\u1eb1ng m\u1ed9t giao d\u1ecbch \u0111\u01b0\u1ee3c coi l\u00e0 m\u1ed9t \u0111\u01a1n v\u1ecb duy nh\u1ea5t, kh\u00f4ng th\u1ec3 chia c\u1eaft, th\u00e0nh c\u00f4ng ho\u00e0n to\u00e0n ho\u1eb7c th\u1ea5t b\u1ea1i ho\u00e0n to\u00e0n. N\u1ebfu b\u1ea5t k\u1ef3 ph\u1ea7n n\u00e0o c\u1ee7a giao d\u1ecbch kh\u00f4ng th\u00e0nh c\u00f4ng th\u00ec to\u00e0n b\u1ed9 giao d\u1ecbch s\u1ebd kh\u00f4ng th\u00e0nh c\u00f4ng v\u00e0 tr\u1ea1ng th\u00e1i c\u01a1 s\u1edf d\u1eef li\u1ec7u kh\u00f4ng thay \u0111\u1ed5i.<\/p>\n<\/li>\n<li>\n<p><strong>T\u00ednh nh\u1ea5t qu\u00e1n:<\/strong> Thu\u1ed9c t\u00ednh nh\u1ea5t qu\u00e1n \u0111\u1ea3m b\u1ea3o r\u1eb1ng m\u1ecdi giao d\u1ecbch \u0111\u1ec1u \u0111\u01b0a c\u01a1 s\u1edf d\u1eef li\u1ec7u t\u1eeb tr\u1ea1ng th\u00e1i h\u1ee3p l\u1ec7 n\u00e0y sang tr\u1ea1ng th\u00e1i h\u1ee3p l\u1ec7 kh\u00e1c. C\u01a1 s\u1edf d\u1eef li\u1ec7u ph\u1ea3i \u0111\u00e1p \u1ee9ng m\u1ed9t t\u1eadp h\u1ee3p c\u00e1c r\u00e0ng bu\u1ed9c c\u1ee5 th\u1ec3 v\u00e0 c\u00e1c giao d\u1ecbch l\u00e0 m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c \u0111\u1ec3 chuy\u1ec3n \u0111\u1ed5i tr\u1ea1ng th\u00e1i.<\/p>\n<\/li>\n<li>\n<p><strong>S\u1ef1 c\u00e1ch ly:<\/strong> Thu\u1ed9c t\u00ednh c\u00e1ch ly \u0111\u1ea3m b\u1ea3o r\u1eb1ng vi\u1ec7c th\u1ef1c hi\u1ec7n \u0111\u1ed3ng th\u1eddi c\u00e1c giao d\u1ecbch s\u1ebd khi\u1ebfn c\u01a1 s\u1edf d\u1eef li\u1ec7u \u1edf c\u00f9ng tr\u1ea1ng th\u00e1i nh\u01b0 khi c\u00e1c giao d\u1ecbch \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n tu\u1ea7n t\u1ef1.<\/p>\n<\/li>\n<li>\n<p><strong>\u0110\u1ed9 b\u1ec1n:<\/strong> \u0110\u1ed9 b\u1ec1n \u0111\u1ea3m b\u1ea3o r\u1eb1ng m\u1ed9t khi giao d\u1ecbch \u0111\u00e3 \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n, n\u00f3 s\u1ebd v\u1eabn \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n ngay c\u1ea3 trong tr\u01b0\u1eddng h\u1ee3p h\u1ec7 th\u1ed1ng b\u1ecb l\u1ed7i.<\/p>\n<\/li>\n<\/ol>\n<h2>C\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a giao d\u1ecbch c\u01a1 s\u1edf d\u1eef li\u1ec7u<\/h2>\n<p>C\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a giao d\u1ecbch c\u01a1 s\u1edf d\u1eef li\u1ec7u, \u0111\u1eb7c tr\u01b0ng nh\u1ea5t l\u00e0 thu\u1ed9c t\u00ednh ACID, bao g\u1ed3m t\u00ednh ch\u1ea5t nguy\u00ean t\u1eed c\u1ee7a ch\u00fang, kh\u1ea3 n\u0103ng duy tr\u00ec t\u00ednh nh\u1ea5t qu\u00e1n tr\u00ean c\u00e1c c\u01a1 s\u1edf d\u1eef li\u1ec7u, th\u1ef1c thi ri\u00eang bi\u1ec7t v\u00e0 k\u1ebft qu\u1ea3 l\u00e2u d\u00e0i.<\/p>\n<ul>\n<li>T\u00ednh nguy\u00ean t\u1eed gi\u00fap kh\u1eafc ph\u1ee5c l\u1ed7i v\u00e0 \u0111\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a c\u01a1 s\u1edf d\u1eef li\u1ec7u b\u1eb1ng c\u00e1ch \u0111\u1ea3m b\u1ea3o r\u1eb1ng n\u1ebfu m\u1ed9t giao d\u1ecbch kh\u00f4ng th\u1ec3 ho\u00e0n th\u00e0nh th\u00ec kh\u00f4ng c\u00f3 t\u00e1c \u0111\u1ed9ng n\u00e0o c\u1ee7a n\u00f3 \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng.<\/li>\n<li>T\u00ednh nh\u1ea5t qu\u00e1n b\u1ea3o v\u1ec7 c\u00e1c r\u00e0ng bu\u1ed9c to\u00e0n v\u1eb9n c\u1ee7a c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u00e0 ng\u0103n ng\u1eeba tham nh\u0169ng.<\/li>\n<li>S\u1ef1 c\u00f4 l\u1eadp \u0111\u1ea3m b\u1ea3o r\u1eb1ng c\u00e1c giao d\u1ecbch \u0111\u1ed3ng th\u1eddi kh\u00f4ng can thi\u1ec7p l\u1eabn nhau.<\/li>\n<li>\u0110\u1ed9 b\u1ec1n \u0111\u1ea3m b\u1ea3o r\u1eb1ng nh\u1eefng thay \u0111\u1ed5i c\u1ee7a giao d\u1ecbch th\u00e0nh c\u00f4ng v\u1eabn t\u1ed3n t\u1ea1i ngay c\u1ea3 khi c\u00f3 l\u1ed7i h\u1ec7 th\u1ed1ng.<\/li>\n<\/ul>\n<h2>C\u00e1c lo\u1ea1i giao d\u1ecbch c\u01a1 s\u1edf d\u1eef li\u1ec7u<\/h2>\n<p>C\u00f3 hai lo\u1ea1i giao d\u1ecbch c\u01a1 s\u1edf d\u1eef li\u1ec7u ch\u00ednh: giao d\u1ecbch ph\u1eb3ng (ho\u1eb7c ti\u00eau chu\u1ea9n) v\u00e0 giao d\u1ecbch l\u1ed3ng nhau.<\/p>\n<table>\n<thead>\n<tr>\n<th>Lo\u1ea1i giao d\u1ecbch<\/th>\n<th>S\u1ef1 mi\u00eau t\u1ea3<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Giao d\u1ecbch c\u1ed1 \u0111\u1ecbnh<\/td>\n<td>\u0110\u00e2y l\u00e0 nh\u1eefng giao d\u1ecbch ph\u1ed5 bi\u1ebfn nh\u1ea5t trong \u0111\u00f3 t\u1ea5t c\u1ea3 c\u00e1c ho\u1ea1t \u0111\u1ed9ng \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n c\u00f9ng m\u1ed9t l\u00fac v\u00e0 kh\u00f4ng c\u00f3 c\u1ea5u tr\u00fac l\u1ed3ng nhau.<\/td>\n<\/tr>\n<tr>\n<td>Giao d\u1ecbch l\u1ed3ng nhau<\/td>\n<td>Ch\u00fang ph\u1ee9c t\u1ea1p h\u01a1n v\u00e0 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c nh\u00fang trong c\u00e1c giao d\u1ecbch kh\u00e1c. Ch\u00fang cung c\u1ea5p t\u00ednh linh ho\u1ea1t v\u00e0 kh\u1ea3 n\u0103ng ki\u1ec3m so\u00e1t cao h\u01a1n \u0111\u1ed1i v\u1edbi c\u00e1c ho\u1ea1t \u0111\u1ed9ng c\u1ee7a c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u00e0 cho ph\u00e9p x\u00e1c nh\u1eadn m\u1ed9t ph\u1ea7n.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>S\u1eed d\u1ee5ng giao d\u1ecbch c\u01a1 s\u1edf d\u1eef li\u1ec7u: Nh\u1eefng th\u00e1ch th\u1ee9c v\u00e0 gi\u1ea3i ph\u00e1p chung<\/h2>\n<p>M\u1ed9t trong nh\u1eefng th\u00e1ch th\u1ee9c ph\u1ed5 bi\u1ebfn nh\u1ea5t v\u1edbi c\u00e1c giao d\u1ecbch c\u01a1 s\u1edf d\u1eef li\u1ec7u l\u00e0 x\u1eed l\u00fd vi\u1ec7c ki\u1ec3m so\u00e1t \u0111\u1ed3ng th\u1eddi. C\u00e1c giao d\u1ecbch \u0111\u1ed3ng th\u1eddi c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn nhi\u1ec1u xung \u0111\u1ed9t v\u00e0 v\u1ea5n \u0111\u1ec1 kh\u00e1c nhau, ch\u1eb3ng h\u1ea1n nh\u01b0 \u0111\u1ecdc sai, \u0111\u1ecdc kh\u00f4ng l\u1eb7p l\u1ea1i v\u00e0 \u0111\u1ecdc \u1ea3o.<\/p>\n<p>Gi\u1ea3i ph\u00e1p cho nh\u1eefng v\u1ea5n \u0111\u1ec1 n\u00e0y th\u01b0\u1eddng li\u00ean quan \u0111\u1ebfn c\u00e1c m\u1ee9c c\u00e1ch ly giao d\u1ecbch c\u1ee5 th\u1ec3 v\u00e0 c\u01a1 ch\u1ebf kh\u00f3a \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o c\u00e1c giao d\u1ecbch kh\u00f4ng can thi\u1ec7p l\u1eabn nhau.<\/p>\n<p>M\u1ed9t th\u00e1ch th\u1ee9c kh\u00e1c l\u00e0 \u0111\u1ea3m b\u1ea3o t\u00ednh b\u1ec1n v\u1eefng c\u1ee7a giao d\u1ecbch trong tr\u01b0\u1eddng h\u1ee3p h\u1ec7 th\u1ed1ng b\u1ecb l\u1ed7i. \u0110i\u1ec1u n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c x\u1eed l\u00fd b\u1eb1ng c\u00e1ch ghi nh\u1eadt k\u00fd v\u00e0 ghi nh\u1eadt k\u00fd ghi tr\u01b0\u1edbc, ghi l\u1ea1i c\u00e1c thay \u0111\u1ed5i v\u00e0o nh\u1eadt k\u00fd tr\u01b0\u1edbc khi ch\u00fang \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng v\u00e0o c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/p>\n<h2>Giao d\u1ecbch c\u01a1 s\u1edf d\u1eef li\u1ec7u so v\u1edbi c\u00e1c kh\u00e1i ni\u1ec7m t\u01b0\u01a1ng t\u1ef1<\/h2>\n<p>C\u00e1c giao d\u1ecbch c\u01a1 s\u1edf d\u1eef li\u1ec7u c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c so s\u00e1nh v\u1edbi c\u00e1c kh\u00e1i ni\u1ec7m t\u01b0\u01a1ng t\u1ef1 nh\u01b0 ho\u1ea1t \u0111\u1ed9ng c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u00e0 quy tr\u00ecnh c\u01a1 s\u1edf d\u1eef li\u1ec7u. Trong khi m\u1ed9t thao t\u00e1c c\u01a1 s\u1edf d\u1eef li\u1ec7u l\u00e0 m\u1ed9t h\u00e0nh \u0111\u1ed9ng \u0111\u01a1n l\u1ebb nh\u01b0 \u0111\u1ecdc ho\u1eb7c ghi, th\u00ec m\u1ed9t giao d\u1ecbch l\u1ea1i bao g\u1ed3m nhi\u1ec1u thao t\u00e1c d\u01b0\u1edbi d\u1ea1ng m\u1ed9t \u0111\u01a1n v\u1ecb c\u00f4ng vi\u1ec7c.<\/p>\n<p>C\u00e1c \u0111\u1eb7c \u0111i\u1ec3m ch\u00ednh gi\u00fap ph\u00e2n bi\u1ec7t c\u00e1c giao d\u1ecbch l\u00e0 s\u1ef1 tu\u00e2n th\u1ee7 c\u00e1c thu\u1ed9c t\u00ednh ACID, t\u00ednh ch\u1ea5t nguy\u00ean t\u1eed v\u00e0 vai tr\u00f2 c\u1ee7a ch\u00fang trong vi\u1ec7c duy tr\u00ec t\u00ednh nh\u1ea5t qu\u00e1n v\u00e0 t\u00ednh to\u00e0n v\u1eb9n trong c\u01a1 s\u1edf d\u1eef li\u1ec7u.<\/p>\n<h2>Quan \u0111i\u1ec3m t\u01b0\u01a1ng lai v\u1ec1 giao d\u1ecbch c\u01a1 s\u1edf d\u1eef li\u1ec7u<\/h2>\n<p>T\u01b0\u01a1ng lai c\u1ee7a c\u00e1c giao d\u1ecbch c\u01a1 s\u1edf d\u1eef li\u1ec7u c\u00f3 th\u1ec3 b\u1ecb \u1ea3nh h\u01b0\u1edfng b\u1edfi xu h\u01b0\u1edbng \u0111ang di\u1ec5n ra \u0111\u1ed1i v\u1edbi c\u01a1 s\u1edf d\u1eef li\u1ec7u ph\u00e2n t\u00e1n v\u00e0 ki\u1ebfn tr\u00fac d\u1ecbch v\u1ee5 vi m\u00f4. Nh\u1eefng m\u00f4 h\u00ecnh n\u00e0y mang \u0111\u1ebfn nh\u1eefng th\u00e1ch th\u1ee9c m\u1edbi, \u0111\u1eb7c bi\u1ec7t l\u00e0 trong vi\u1ec7c duy tr\u00ec c\u00e1c thu\u1ed9c t\u00ednh ACID tr\u00ean nhi\u1ec1u h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n.<\/p>\n<p>C\u00e1c ph\u01b0\u01a1ng ph\u00e1p ti\u1ebfp c\u1eadn m\u1edbi nh\u01b0 m\u1eabu Saga ho\u1eb7c m\u00f4 h\u00ecnh nh\u1ea5t qu\u00e1n cu\u1ed1i c\u00f9ng \u0111ang \u0111\u01b0\u1ee3c kh\u00e1m ph\u00e1 \u0111\u1ec3 x\u1eed l\u00fd c\u00e1c giao d\u1ecbch trong c\u00e1c m\u00f4i tr\u01b0\u1eddng n\u00e0y. Ngo\u00e0i ra, c\u00f4ng ngh\u1ec7 blockchain, k\u1ebft h\u1ee3p c\u00e1c nguy\u00ean t\u1eafc giao d\u1ecbch ph\u00e2n t\u00e1n, c\u0169ng c\u00f3 th\u1ec3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn s\u1ef1 ph\u00e1t tri\u1ec3n trong t\u01b0\u01a1ng lai c\u1ee7a l\u0129nh v\u1ef1c n\u00e0y.<\/p>\n<h2>M\u00e1y ch\u1ee7 proxy v\u00e0 giao d\u1ecbch c\u01a1 s\u1edf d\u1eef li\u1ec7u<\/h2>\n<p>C\u00e1c m\u00e1y ch\u1ee7 proxy, gi\u1ed1ng nh\u01b0 c\u00e1c m\u00e1y ch\u1ee7 do OneProxy cung c\u1ea5p, c\u00f3 th\u1ec3 \u0111\u00f3ng m\u1ed9t vai tr\u00f2 quan tr\u1ecdng trong c\u00e1c giao d\u1ecbch c\u01a1 s\u1edf d\u1eef li\u1ec7u, \u0111\u1eb7c bi\u1ec7t l\u00e0 trong m\u00f4i tr\u01b0\u1eddng c\u01a1 s\u1edf d\u1eef li\u1ec7u ph\u00e2n t\u00e1n. Ch\u00fang c\u00f3 th\u1ec3 cung c\u1ea5p th\u00eam m\u1ed9t l\u1edbp b\u1ea3o m\u1eadt v\u00e0 \u1ea9n danh, b\u1ea3o v\u1ec7 c\u01a1 s\u1edf d\u1eef li\u1ec7u kh\u1ecfi b\u1ecb truy c\u1eadp tr\u00e1i ph\u00e9p v\u00e0 c\u00f3 kh\u1ea3 n\u0103ng c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t th\u00f4ng qua b\u1ed9 nh\u1edb \u0111\u1ec7m.<\/p>\n<p>M\u00e1y ch\u1ee7 proxy c\u0169ng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 ph\u00e2n ph\u1ed1i t\u1ea3i trong c\u00e1c t\u00ecnh hu\u1ed1ng c\u00f3 l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp cao v\u00e0 c\u00f3 th\u1ec3 \u0111\u00f3ng vai tr\u00f2 qu\u1ea3n l\u00fd c\u00e1c giao d\u1ecbch ph\u00e2n t\u00e1n b\u1eb1ng c\u00e1ch t\u1ea1o \u0111i\u1ec1u ki\u1ec7n li\u00ean l\u1ea1c gi\u1eefa c\u00e1c h\u1ec7 th\u1ed1ng c\u01a1 s\u1edf d\u1eef li\u1ec7u kh\u00e1c nhau.<\/p>\n<h2>Li\u00ean k\u1ebft li\u00ean quan<\/h2>\n<p>\u0110\u1ec3 bi\u1ebft th\u00eam th\u00f4ng tin v\u1ec1 c\u00e1c giao d\u1ecbch c\u01a1 s\u1edf d\u1eef li\u1ec7u, h\u00e3y xem x\u00e9t c\u00e1c t\u00e0i nguy\u00ean sau:<\/p>\n<ol>\n<li><a href=\"https:\/\/www.amazon.com\/Database-Systems-Complete-Book-2nd\/dp\/0131873253\" target=\"_new\" rel=\"noopener nofollow\">H\u1ec7 th\u1ed1ng c\u01a1 s\u1edf d\u1eef li\u1ec7u: Cu\u1ed1n s\u00e1ch ho\u00e0n ch\u1ec9nh<\/a><\/li>\n<li><a href=\"https:\/\/www.geeksforgeeks.org\/acid-properties-in-dbms\/\" target=\"_new\" rel=\"noopener nofollow\">Thu\u1ed9c t\u00ednh ACID trong DBMS<\/a><\/li>\n<li><a href=\"https:\/\/www.coursera.org\/lecture\/data-manipulation\/transactions-in-database-systems-4XJkn\" target=\"_new\" rel=\"noopener nofollow\">Giao d\u1ecbch trong h\u1ec7 th\u1ed1ng c\u01a1 s\u1edf d\u1eef li\u1ec7u<\/a><\/li>\n<li><a href=\"https:\/\/microservices.io\/patterns\/data\/distributed-transactions.html\" target=\"_new\" rel=\"noopener nofollow\">Giao d\u1ecbch ph\u00e2n t\u00e1n trong microservice<\/a><\/li>\n<\/ol>\n<p>H\u00e3y nh\u1edb r\u1eb1ng OneProxy c\u00f3 th\u1ec3 cung c\u1ea5p c\u00e1c m\u00e1y ch\u1ee7 proxy an to\u00e0n, \u0111\u00e1ng tin c\u1eady m\u00e0 b\u1ea1n c\u1ea7n \u0111\u1ec3 qu\u1ea3n l\u00fd c\u00e1c giao d\u1ecbch c\u01a1 s\u1edf d\u1eef li\u1ec7u trong m\u1ecdi m\u00f4i tr\u01b0\u1eddng.<\/p>","protected":false},"featured_media":468171,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-476742","wiki","type-wiki","status-publish","has-post-thumbnail","hentry"],"acf":{"faq_title":"Frequently Asked Questions about <mark>Database Transactions: An In-Depth Look<\/mark>","faq_items":[{"question":"What is a database transaction?","answer":"<p>A database transaction is a sequence of one or more operations performed as a single logical unit of work within a database system. It provides a reliable mechanism for data manipulation and ensures the consistency and integrity of data within a database.<\/p>"},{"question":"What are the origins of database transactions?","answer":"<p>The concept of the transaction in the context of databases was first introduced in the 1960s with the advent of database management systems. IBM's System R, one of the first systems to implement the SQL language, is often credited with developing the concept of atomic transactions in the 1970s. The database transaction was further refined by Jim Gray and Andreas Reuter in 1983 when they laid out the ACID properties (Atomicity, Consistency, Isolation, Durability).<\/p>"},{"question":"What are the ACID properties in a database transaction?","answer":"<p>ACID properties in a database transaction refer to Atomicity, Consistency, Isolation, and Durability. Atomicity ensures that a transaction is treated as a single, indivisible unit. Consistency ensures that any transaction brings the database from one valid state to another. Isolation ensures that concurrent execution of transactions results in a consistent database state. Durability guarantees that once a transaction has been committed, it will remain so, even in the case of a system failure.<\/p>"},{"question":"What are the main types of database transactions?","answer":"<p>There are two main types of database transactions: flat transactions and nested transactions. Flat transactions are the most common transactions where all operations are executed at once. Nested transactions are more complex and can be embedded within other transactions, providing more flexibility and control over database operations and allowing partial commits.<\/p>"},{"question":"What are some common challenges in using database transactions and how can they be solved?","answer":"<p>One of the most common challenges with database transactions is dealing with concurrency control. This can lead to conflicts and issues like dirty reads, non-repeatable reads, and phantom reads. Solutions often involve specific transaction isolation levels and locking mechanisms to ensure that transactions don't interfere with each other. Another challenge is ensuring the durability of transactions in the event of a system failure, generally handled by journaling and write-ahead logging.<\/p>"},{"question":"How can proxy servers like OneProxy be used with database transactions?","answer":"<p>Proxy servers, like those provided by OneProxy, can provide an extra layer of security and anonymity to database transactions. They protect databases from unauthorized access and can potentially improve performance through caching. Proxy servers can also be used to distribute load in high-traffic scenarios and facilitate communication between different database systems in distributed transactions.<\/p>"},{"question":"What are the future perspectives related to database transactions?","answer":"<p>The future of database transactions is likely to be influenced by distributed databases and microservices architectures. These bring new challenges, particularly in maintaining the ACID properties across multiple distributed systems. New approaches such as the Saga pattern, eventual consistency model, and technologies like blockchain, which incorporate principles of distributed transactions, may influence future developments in this field.<\/p>"}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/476742","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki"}],"about":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/types\/wiki"}],"version-history":[{"count":0,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/476742\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media\/468171"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media?parent=476742"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}