{"id":345,"date":"2022-06-25T13:17:11","date_gmt":"2022-06-25T05:17:11","guid":{"rendered":"https:\/\/frogvps.com\/?p=345"},"modified":"2022-06-25T13:17:11","modified_gmt":"2022-06-25T05:17:11","slug":"mysql%e7%9a%84%e4%ba%8b%e5%8a%a1%e7%ae%a1%e7%90%86%e5%92%8c%e9%9a%94%e7%a6%bb%e7%ba%a7%e5%88%ab%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/frogvps.com\/?p=345","title":{"rendered":"MYSQL\u7684\u4e8b\u52a1\u7ba1\u7406\u548c\u9694\u79bb\u7ea7\u522b\u8be6\u89e3"},"content":{"rendered":"\n<p>\u4e8b\u52a1\uff0c\u53c8\u53ebtransactions\uff0c\u662f\u4e00\u7ec4\u539f\u5b50\u6027\u7684SQL\u8bed\u53e5\uff0c\u4e00\u4e2a\u72ec\u7acb\u7684\u5de5\u4f5c\u5355\u5143\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e8b\u52a1\u7279\u6027<\/h2>\n\n\n\n<p>\u4e8b\u52a1\u5177\u6709ACID\u7279\u6027\u3002<\/p>\n\n\n\n<p><strong>A\uff1aatomicity\uff08\u539f\u5b50\u6027\uff09<\/strong><\/p>\n\n\n\n<p>\u6574\u4e2a\u4e8b\u52a1\u4e2d\u7684\u6240\u6709\u64cd\u4f5c\u8981\u4e48\u5168\u90e8\u6210\u529f\u6267\u884c\uff0c\u8981\u4e48\u5168\u90e8\u5931\u8d25\u56de\u6eda\uff0c\u4e0d\u4f1a\u5b58\u5728\u505a\u4e86\u4e00\u534a\u7684\u60c5\u51b5\u3002<\/p>\n\n\n\n<p>C\uff1a<strong>consistency\uff08\u4e00\u81f4\u6027\uff09<\/strong><\/p>\n\n\n\n<p>\u6570\u636e\u5e93\u603b\u662f\u4ece\u4e00\u4e2a\u4e00\u81f4\u6027\u72b6\u6001\u8f6c\u6362\u4e3a\u53e6\u4e00\u4e2a\u4e00\u81f4\u6027\u72b6\u6001\u3002<\/p>\n\n\n\n<p><strong>I\uff1aIsolation\uff08\u9694\u79bb\u6027\uff09<\/strong><\/p>\n\n\n\n<p>\u4e00\u4e2a\u4e8b\u52a1\u6240\u505a\u51fa\u7684\u64cd\u4f5c\u5728\u6700\u7ec8\u63d0\u4ea4\u4e4b\u524d\uff0c\u662f\u4e0d\u80fd\u4e3a\u5176\u5b83\u4e8b\u52a1\u6240\u89c1\uff0c\u7c7b\u4f3c\u4e8e\u535a\u5ba2\u7684\u8349\u7a3f\uff1b\u6709\u591a\u79cd\u9694\u79bb\u7ea7\u522b\uff0c\u53ef\u4ee5\u4fee\u6539\uff0c\u5b9e\u73b0\u5e76\u53d1\u3002<\/p>\n\n\n\n<p><strong>D\uff1adurability\u6301\u4e45\u6027<\/strong><\/p>\n\n\n\n<p>\u4e00\u65e6\u4e8b\u52a1\u63d0\u4ea4\uff0c\u4fee\u6539\u4f1a\u6c38\u4e45\u4fdd\u5b58\u5728\u6570\u636e\u5e93\u4e2d\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e8b\u52a1\u7ba1\u7406<\/h2>\n\n\n\n<p>\u542f\u52a8\u4e8b\u52a1\uff0c\u4e09\u79cd\u547d\u4ee4\u90fd\u53ef\u4ee5<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>BEGIN\nBEGIN WORK\nSTART TRANSACTION<\/code><\/pre>\n\n\n\n<p>\u7ed3\u675f\u4e8b\u52a1\uff0c\u4e00\u822c\u53ea\u6709\u4e24\u79cd\u53ef\u80fd\uff0c\u63d0\u4ea4\u6216\u8005\u56de\u6eda<\/p>\n\n\n\n<p><strong>\u63d0\u4ea4<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>COMMIT<\/code><\/pre>\n\n\n\n<p><strong>\u56de\u6eda<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ROLLBACK<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b<\/h2>\n\n\n\n<p>MySQL \u652f\u6301\u56db\u79cd\u9694\u79bb\u7ea7\u522b\uff0c\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b\u4ece\u4e0a\u81f3\u4e0b\u66f4\u52a0\u4e25\u683c\u3002<\/p>\n\n\n\n<p>MYSQL 8.0 \u53ef\u4ee5\u901a\u8fc7\u7cfb\u7edf\u53d8\u91cf\u67e5\u8be2\u76ee\u524d\u7684\u4e8b\u52a1\u7684\u9694\u79bb\u7ea7\u522b<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT @@transaction_isolation;<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u9694\u79bb\u7ea7\u522b<\/th><th>\u810f\u8bfb<\/th><th>\u4e0d\u53ef\u91cd\u590d\u5ea6<\/th><th>\u5e7b\u8bfb<\/th><th>\u52a0\u8bfb\u9501<\/th><\/tr><\/thead><tbody><tr><td>\u8bfb\u672a\u63d0\u4ea4<\/td><td>\u53ef\u4ee5\u51fa\u73b0<\/td><td>\u53ef\u4ee5\u51fa\u73b0<\/td><td>\u53ef\u4ee5\u51fa\u73b0<\/td><td>\u5426<\/td><\/tr><tr><td>\u8bfb\u5df2\u63d0\u4ea4<\/td><td>\u4e0d\u5141\u8bb8\u51fa\u73b0<\/td><td>\u53ef\u4ee5\u51fa\u73b0<\/td><td>\u53ef\u4ee5\u51fa\u73b0<\/td><td>\u5426<\/td><\/tr><tr><td>\u53ef\u91cd\u590d\u8bfb<\/td><td>\u4e0d\u5141\u8bb8\u51fa\u73b0<\/td><td>\u4e0d\u5141\u8bb8\u51fa\u73b0<\/td><td>\u53ef\u4ee5\u51fa\u73b0<\/td><td>\u5426<\/td><\/tr><tr><td>\u5e8f\u5217\u5316<\/td><td>\u4e0d\u5141\u8bb8\u51fa\u73b0<\/td><td>\u4e0d\u5141\u8bb8\u51fa\u73b0<\/td><td>\u4e0d\u5141\u8bb8\u51fa\u73b0<\/td><td>\u662f<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>READ-UNCOMMITTED<\/strong><\/p>\n\n\n\n<p>\u53ef\u8bfb\u53d6\u5230\u672a\u63d0\u4ea4\u6570\u636e\uff0c\u4ea7\u751f\u810f\u8bfb\u3002<\/p>\n\n\n\n<p><strong>READ-COMMITTED<\/strong><\/p>\n\n\n\n<p>\u53ef\u8bfb\u53d6\u5230\u5df2\u7ecf\u63d0\u4ea4\u6570\u636e\uff0c\u4f46\u672a\u63d0\u4ea4\u6570\u636e\u4e0d\u53ef\u8bfb\u3002\u4ea7\u751f<strong>\u4e0d\u53ef\u91cd\u590d\u8bfb<\/strong>\uff08\u53ef\u8bfb\u53d6\u5230\u591a\u4e2a\u63d0\u4ea4\u6570\u636e\uff09\uff0c\u5bfc\u81f4\u6bcf\u6b21\u8bfb\u53d6\u6570\u636e\u4e0d\u4e00\u81f4\u3002<\/p>\n\n\n\n<p><strong>REPEATABLE-READ<\/strong><\/p>\n\n\n\n<p>\u53ef\u91cd\u590d\u8bfb\uff0c\u591a\u6b21\u8bfb\u53d6\u6570\u636e\u90fd\u4e00\u81f4\uff0c\u4ea7\u751f\u5e7b\u8bfb\uff08\u6570\u636e\u5df2\u7ecf\u53d8\u4e86\u4f46\u662f\u4f60\u770b\u5230\u7684\u8fd8\u662f\u65e7\u6570\u636e\u5982\u540c\u5e7b\u89c9\uff09\u3002\u5373\u8bfb\u53d6\u8fc7\u7a0b\u4e2d\uff0c\u5373\u4f7f\u6709\u5176\u5b83\u63d0\u4ea4\u7684\u4e8b\u52a1\u4fee\u6539\u4e86\u6570\u636e\uff0c\u4ecd\u53ea\u80fd\u8bfb\u53d6\u5230\u672a\u4fee\u6539\u524d\u7684\u65e7\u6570\u636e\uff0c\u6b64\u4e3aMySQL\u9ed8\u8ba4\u7684\u9694\u79bb\u7ea7\u522b\uff0c\u540c\u65f6\u517c\u987e\u5e76\u53d1\u548c\u6570\u636e\u5b89\u5168\u3002<\/p>\n\n\n\n<p><strong>SERIALIZABLE<\/strong><\/p>\n\n\n\n<p>\u53ef\u4e32\u884c\u5316\uff0c\u672a\u63d0\u4ea4\u7684\u8bfb\u4e8b\u52a1\u963b\u585e\u4fee\u6539\u4e8b\u52a1\uff08\u52a0\u8bfb\u9501\uff0c\u4f46\u4e0d\u963b\u585e\u8bfb\u4e8b\u52a1\uff09\uff0c\u6216\u8005\u672a\u63d0\u4ea4\u7684\u4fee\u6539\u4e8b\u52a1\u963b\u585e\u5176\u5b83\u4e8b\u52a1\u7684\u8bfb\u5199\uff08\u52a0\u5199\u9501\uff0c\u5176\u5b83\u4e8b\u52a1\u7684\u8bfb\uff0c\u5199\u90fd\u4e0d\u53ef\u4ee5\u6267\u884c\uff09\u3002\u5e76\u53d1\u6027\u80fd\u5dee\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>REPEATABLE-READ<\/strong><\/h2>\n\n\n\n<p>\u9ed8\u8ba4\u7684\u7b2c\u4e09\u79cd\u9694\u79bb\u7ea7\u522b\uff0c\u53ef\u91cd\u590d\u8bfb\u7684\u610f\u601d\u662f\uff0c\u5047\u8bbe\u6211\u5728\u4e00\u53f0\u670d\u52a1\u5668\u7684\u6570\u636e\u5e93\u4e0a\u6253\u5f00\u4e86\u4e24\u4e2a\u7ec8\u7aef\uff0c\u5206\u522b\u5f00\u542f\u4e86\u4e24\u4e2a\u4e8b\u52a1A\u548c\u4e8b\u52a1B\u3002\u6211\u5728\u4e8b\u52a1A\u5f80\u4e00\u4e2a\u8868\u6dfb\u52a0\u4e86\u4e00\u6761\u8bb0\u5f55\uff0c\u5728\u6ca1\u6709\u63d0\u4ea4\u4e4b\u524d\uff0cB\u4e8b\u52a1\u662f\u8bfb\u4e0d\u5230\u8fd9\u6761\u8bb0\u5f55\u7684\u3002\u8fd9\u65f6\u5019\u6211\u5728A\u4e8b\u52a1\u91cc\u9762\u63d0\u4ea4\u4e86\u8fd9\u6761\u8bb0\u5f55\uff0c\u8fd9\u65f6\u5019\u8868\u683c\u7684\u6570\u636e\u5df2\u7ecf\u88ab\u4fee\u6539\u4e86\uff0c\u4f46\u662fB\u4e8b\u52a1\u8bfb\u5230\u7684\u8fd8\u662f\u4fee\u6539\u524d\u7684\u65e7\u6570\u636e\u3002\u53ea\u6709\u5f53B\u4e8b\u52a1\u88ab\u6700\u7ec8\u63d0\u4ea4commit\u4ee5\u540e\uff0c\u6211\u5728B\u7ec8\u7aef\u624d\u80fd\u770b\u5230A\u6dfb\u52a0\u7684\u8bb0\u5f55\u3002B\u5728\u5b83\u81ea\u5df1\u7684\u4e8b\u52a1\u8fd8\u6ca1\u6709\u63d0\u4ea4\u4e4b\u524d\uff0c\u662f\u770b\u4e0d\u89c1\u5df2\u7ecf\u4fee\u6539\u7684\u6570\u636e\u7684\uff0c\u53ea\u80fd\u770b\u89c1\u65e7\u6570\u636e\u3002<\/p>\n\n\n\n<p>\u8fd9\u4e2a\u539f\u7406\u6709\u4ec0\u4e48\u7528\u5462\uff1f\u5b83\u53ef\u4ee5\u4fdd\u8bc1\u5907\u4efd\u6570\u636e\u7684\u4e00\u81f4\u6027\u3002\u5047\u8bbe\u4e00\u4e2a\u6570\u636e\u5e93\u5f88\u5927\uff0c\u5907\u4efd\u9700\u8981\u6301\u7eed30\u5206\u949f\uff0c\u5982\u679c\u5907\u4efd\u624d\u8fdb\u884c\u4e86\u4e00\u534a\uff0c\u6570\u636e\u5c31\u88ab\u7528\u6237\u4fee\u6539\u4e86\uff0c\u8fd9\u6837\u7684\u5907\u4efd\u5c31\u662f\u6ca1\u6709\u4efb\u4f55\u610f\u4e49\u7684\u3002\u89e3\u51b3\u65b9\u6cd5\u5f88\u7b80\u5355\uff0c\u5148\u5f00\u542f\u5907\u4efd\u4e8b\u52a1\uff0c\u5728\u5907\u4efd\u671f\u95f4\uff0c\u5373\u4f7f\u7528\u6237\u5bf9\u6570\u636e\u5e93\u8fdb\u884c\u5404\u79cd\u589e\u5220\u6539\uff0c\u5907\u4efd\u4e8b\u52a1\u770b\u5230\u7684\u6570\u636e\u59cb\u7ec8\u662f\u67d0\u4e2a\u56fa\u5b9a\u7684\u65f6\u95f4\u70b9\u7684\uff0c\u8fd9\u6837\u4fdd\u8bc1\u4e86\u5907\u4efd\u6570\u636e\u7684\u4e00\u81f4\u6027\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4fee\u6539\u9694\u79bb\u7ea7\u522b<\/h2>\n\n\n\n<p><strong>\u65b9\u6cd5\u4e00\uff1a\u4fee\u6539\u7cfb\u7edf\u53d8\u91cf\uff0c\u652f\u6301GLOBAL\u548cSESSION<\/strong><\/p>\n\n\n\n<p>MYSQL 8.0 \u4e4b\u524d\u7684\u7248\u672c<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SET tx_isolation='READ-UNCOMMITTED|READ-COMMITTED|REPEATABLE-READ|SERIALIZABLE'<\/code><\/pre>\n\n\n\n<p>MYSQL 8.0<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SET transaction_isolation='READ-UNCOMMITTED|READ-COMMITTED|REPEATABLE-READ|SERIALIZABLE'<\/code><\/pre>\n\n\n\n<p><strong>\u65b9\u6cd5\u4e8c\uff1a\u4fee\u6539\u670d\u52a1\u5668\u914d\u7f6e\u6587\u4ef6<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&#91;mysqld]\ntransaction-isolation=SERIALIZABLE<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">MVCC\u548c\u4e8b\u52a1\u7684\u9694\u79bb\u7ea7\u522b\u7684\u5173\u7cfb<\/h2>\n\n\n\n<p>MVCC\uff08\u591a\u7248\u672c\u5e76\u53d1\u63a7\u5236\u673a\u5236\uff09\u53ea\u5728READ COMMITTED\u548cREPEATABLE READ\u4e24\u4e2a\u9694\u79bb\u7ea7\u522b\u4e0b\u5de5\u4f5c\u3002\u5176\u4ed6\u4e24\u4e2a\u9694\u79bb\u7ea7\u522b\u90fd\u548cMVCC\u4e0d\u517c\u5bb9,\u56e0\u4e3aREAD UNCOMMITTED\u603b\u662f\u8bfb\u53d6\u6700\u65b0\u7684\u6570\u636e\u884c\uff0c\u800c\u4e0d\u662f\u7b26\u5408\u5f53\u524d\u4e8b\u52a1\u7248\u672c\u7684\u6570\u636e\u884c\u3002\u800cSERIALIZABLE\u5219\u4f1a\u5bf9\u6240\u6709\u8bfb\u53d6\u7684\u884c\u90fd\u52a0\u9501\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e8b\u52a1\uff0c\u53c8\u53ebtransactions\uff0c\u662f\u4e00\u7ec4\u539f\u5b50\u6027\u7684SQL\u8bed\u53e5\uff0c\u4e00\u4e2a\u72ec\u7acb\u7684\u5de5\u4f5c\u5355\u5143\u3002 \u4e8b\u52a1\u7279\u6027 \u4e8b\u52a1\u5177\u6709ACID\u7279\u6027\u3002 A\uff1aatomicity\uff08\u539f\u5b50\u6027\uff09 \u6574\u4e2a\u4e8b\u52a1\u4e2d\u7684\u6240\u6709\u64cd\u4f5c\u8981\u4e48\u5168\u90e8\u6210\u529f\u6267\u884c\uff0c\u8981\u4e48\u5168\u90e8\u5931\u8d25\u56de\u6eda\uff0c\u4e0d\u4f1a\u5b58\u5728\u505a\u4e86\u4e00\u534a\u7684\u60c5\u51b5\u3002 C\uff1ac&#8230;<\/p>\n","protected":false},"author":1,"featured_media":283,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35],"tags":[36],"topic":[],"class_list":["post-345","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-35","tag-mysql"],"_links":{"self":[{"href":"https:\/\/frogvps.com\/index.php?rest_route=\/wp\/v2\/posts\/345","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/frogvps.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/frogvps.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/frogvps.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/frogvps.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=345"}],"version-history":[{"count":4,"href":"https:\/\/frogvps.com\/index.php?rest_route=\/wp\/v2\/posts\/345\/revisions"}],"predecessor-version":[{"id":349,"href":"https:\/\/frogvps.com\/index.php?rest_route=\/wp\/v2\/posts\/345\/revisions\/349"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/frogvps.com\/index.php?rest_route=\/wp\/v2\/media\/283"}],"wp:attachment":[{"href":"https:\/\/frogvps.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=345"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/frogvps.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=345"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/frogvps.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=345"},{"taxonomy":"topic","embeddable":true,"href":"https:\/\/frogvps.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftopic&post=345"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}