{"id":199732,"date":"2025-05-06T09:42:27","date_gmt":"2025-05-06T01:42:27","guid":{"rendered":"https:\/\/server.hk\/cnblog\/199732\/"},"modified":"2025-05-06T09:42:27","modified_gmt":"2025-05-06T01:42:27","slug":"%e7%ae%a1%e7%90%86mysql%e4%ba%8b%e5%8a%a1%e4%b8%ad%e5%b9%b6%e5%8f%91%e5%92%8c%e9%9a%94%e7%a6%bb%e7%ba%a7%e5%88%ab","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/199732\/","title":{"rendered":"\u7ba1\u7406MySQL\u4e8b\u52a1\u4e2d\u5e76\u53d1\u548c\u9694\u79bb\u7ea7\u522b"},"content":{"rendered":"

<\/b> <\/p>\n

\u7ba1\u7406MySQL\u4e8b\u52a1\u4e2d\u5e76\u53d1\u548c\u9694\u79bb\u7ea7\u522b<\/h1>\n

\u4e00\u5206\u8015\u8018\uff0c\u4e00\u5206\u6536\u83b7\uff01\u65e2\u7136\u6253\u5f00\u4e86\u8fd9\u7bc7\u6587\u7ae0\uff0c\u5c31\u575a\u6301\u770b\u4e0b\u53bb\u5427\uff01\u6587\u4e2d\u5185\u5bb9\u5305\u542b\u7b49\u7b49\u77e5\u8bc6\u70b9…\u5e0c\u671b\u4f60\u80fd\u5728\u9605\u8bfb\u672c\u6587\u540e\uff0c\u80fd\u771f\u771f\u5b9e\u5b9e\u5b66\u5230\u77e5\u8bc6\u6216\u8005\u5e2e\u4f60\u89e3\u51b3\u5fc3\u4e2d\u7684\u7591\u60d1\uff0c\u4e5f\u6b22\u8fce\u5927\u4f6c\u6216\u8005\u65b0\u4eba\u670b\u53cb\u4eec\u591a\u7559\u8a00\u8bc4\u8bba\uff0c\u591a\u7ed9\u5efa\u8bae\uff01\u8c22\u8c22\uff01<\/p>\n

\u6807\u9898\uff1a\u6df1\u5165\u63a2\u8ba8MySQL\u4e8b\u52a1\u7684\u9694\u79bb\u7ea7\u522b\u4e0e\u5e76\u53d1\u63a7\u5236<\/p>\n

\u968f\u7740\u6570\u636e\u5e93\u5e94\u7528\u573a\u666f\u7684\u65e5\u76ca\u590d\u6742\uff0c\u4e8b\u52a1\u7684\u9694\u79bb\u7ea7\u522b\u4e0e\u5e76\u53d1\u63a7\u5236\u6210\u4e3a\u4e86\u6570\u636e\u5e93\u7ba1\u7406\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u91cd\u8981\u8bdd\u9898\u3002MySQL\u4f5c\u4e3a\u4e00\u6b3e\u5e7f\u6cdb\u4f7f\u7528\u7684\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff0c\u5176\u4e8b\u52a1\u5904\u7406\u529f\u80fd\u4e5f\u5907\u53d7\u5e7f\u5927\u5f00\u53d1\u8005\u91cd\u89c6\u3002\u672c\u6587\u5c06\u6df1\u5165\u63a2\u8ba8MySQL\u4e8b\u52a1\u7684\u9694\u79bb\u7ea7\u522b\u4e0e\u5e76\u53d1\u63a7\u5236\uff0c\u5e76\u7ed3\u5408\u5177\u4f53\u7684\u4ee3\u7801\u793a\u4f8b\u8fdb\u884c\u5206\u6790\u3002<\/p>\n

1. MySQL\u4e8b\u52a1\u7684\u9694\u79bb\u7ea7\u522b<\/h3>\n

MySQL\u652f\u6301\u56db\u79cd\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b\uff0c\u5206\u522b\u662fREAD UNCOMMITTED\u3001READ COMMITTED\u3001REPEATABLE READ\u548cSERIALIZABLE\u3002\u4e0d\u540c\u7684\u9694\u79bb\u7ea7\u522b\u5bf9\u4e8b\u52a1\u7684\u5e76\u53d1\u63a7\u5236\u6709\u4e0d\u540c\u7684\u5f71\u54cd\uff0c\u5f00\u53d1\u8005\u9700\u8981\u6839\u636e\u5b9e\u9645\u9700\u6c42\u9009\u62e9\u5408\u9002\u7684\u9694\u79bb\u7ea7\u522b\u3002<\/p>\n

1.1 READ UNCOMMITTED\uff08\u8bfb\u672a\u63d0\u4ea4\uff09<\/h4>\n

READ UNCOMMITTED\u662f\u6700\u4f4e\u7ea7\u522b\u7684\u9694\u79bb\u7ea7\u522b\uff0c\u4e8b\u52a1\u53ef\u4ee5\u8bfb\u53d6\u5176\u4ed6\u672a\u63d0\u4ea4\u7684\u4e8b\u52a1\u6240\u505a\u7684\u4fee\u6539\u3002\u8fd9\u79cd\u9694\u79bb\u7ea7\u522b\u4e0b\uff0c\u5b58\u5728\u810f\u8bfb\uff08Dirty Read\uff09\u7684\u98ce\u9669\uff0c\u5373\u4e00\u4e2a\u4e8b\u52a1\u8bfb\u53d6\u5230\u53e6\u4e00\u4e2a\u672a\u63d0\u4ea4\u4e8b\u52a1\u7684\u6570\u636e\uff0c\u53ef\u80fd\u9020\u6210\u6570\u636e\u4e0d\u4e00\u81f4\u6027\u3002<\/p>\n

-- \u8bbe\u7f6e\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b\u4e3aREAD UNCOMMITTED\nSET SESSION TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;<\/pre>\n
1.2 READ COMMITTED\uff08\u8bfb\u63d0\u4ea4\uff09<\/h4>\n
READ COMMITTED\u9694\u79bb\u7ea7\u522b\u4e0b\uff0c\u4e8b\u52a1\u53ea\u80fd\u8bfb\u53d6\u5176\u4ed6\u5df2\u63d0\u4ea4\u4e8b\u52a1\u6240\u505a\u7684\u4fee\u6539\u3002\u8fd9\u79cd\u9694\u79bb\u7ea7\u522b\u53ef\u4ee5\u907f\u514d\u810f\u8bfb\uff0c\u4f46\u4ecd\u7136\u5b58\u5728\u4e0d\u53ef\u91cd\u590d\u8bfb\uff08Non-Repeatable Read\uff09\u548c\u5e7b\u8bfb\uff08Phantom Read\uff09\u7684\u95ee\u9898\u3002<\/p>\n
-- \u8bbe\u7f6e\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b\u4e3aREAD COMMITTED\nSET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED;<\/pre>\n
1.3 REPEATABLE READ\uff08\u53ef\u91cd\u590d\u8bfb\uff09<\/h4>\n
\u5728REPEATABLE READ\u9694\u79bb\u7ea7\u522b\u4e0b\uff0c\u4e8b\u52a1\u5728\u6267\u884c\u8fc7\u7a0b\u4e2d\u65e0\u8bba\u5176\u4ed6\u4e8b\u52a1\u5982\u4f55\u4fee\u6539\u6570\u636e\uff0c\u5176\u67e5\u8be2\u7ed3\u679c\u59cb\u7ec8\u4fdd\u6301\u4e00\u81f4\u3002\u8fd9\u79cd\u9694\u79bb\u7ea7\u522b\u53ef\u4ee5\u907f\u514d\u810f\u8bfb\u548c\u4e0d\u53ef\u91cd\u590d\u8bfb\uff0c\u4f46\u4ecd\u53ef\u80fd\u51fa\u73b0\u5e7b\u8bfb\u7684\u60c5\u51b5\u3002<\/p>\n
-- \u8bbe\u7f6e\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b\u4e3aREPEATABLE READ\nSET SESSION TRANSACTION ISOLATION LEVEL REPEATABLE READ;<\/pre>\n
1.4 SERIALIZABLE\uff08\u4e32\u884c\u5316\uff09<\/h4>\n
SERIALIZABLE\u662f\u6700\u9ad8\u7ea7\u522b\u7684\u9694\u79bb\u7ea7\u522b\uff0c\u4e8b\u52a1\u4f1a\u6309\u987a\u5e8f\u6267\u884c\uff0c\u5e76\u4e14\u4fdd\u8bc1\u4e8b\u52a1\u4e4b\u95f4\u4e0d\u4f1a\u76f8\u4e92\u5f71\u54cd\u3002\u8fd9\u79cd\u9694\u79bb\u7ea7\u522b\u80fd\u591f\u907f\u514d\u810f\u8bfb\u3001\u4e0d\u53ef\u91cd\u590d\u8bfb\u548c\u5e7b\u8bfb\uff0c\u4f46\u4f1a\u964d\u4f4e\u5e76\u53d1\u6027\u80fd\u3002<\/p>\n
-- \u8bbe\u7f6e\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b\u4e3aSERIALIZABLE\nSET SESSION TRANSACTION ISOLATION LEVEL SERIALIZABLE;<\/pre>\n
2. MySQL\u4e8b\u52a1\u7684\u5e76\u53d1\u63a7\u5236<\/h3>\n
\u5728MySQL\u4e2d\uff0c\u4e3a\u4e86\u4fdd\u8bc1\u4e8b\u52a1\u4e4b\u95f4\u7684\u5e76\u53d1\u6267\u884c\u4e0d\u4f1a\u5f15\u53d1\u6570\u636e\u4e0d\u4e00\u81f4\u6027\u7684\u95ee\u9898\uff0c\u9700\u8981\u8fdb\u884c\u5e76\u53d1\u63a7\u5236\u3002\u5e38\u7528\u7684\u5e76\u53d1\u63a7\u5236\u65b9\u6cd5\u5305\u62ec\u9501\u5b9a\u3001MVCC\uff08\u591a\u7248\u672c\u5e76\u53d1\u63a7\u5236\uff09\u7b49\u3002<\/p>\n
2.1 \u9501\u5b9a<\/h4>\n
MySQL\u652f\u6301\u884c\u7ea7\u9501\u3001\u8868\u7ea7\u9501\u7b49\u4e0d\u540c\u7c92\u5ea6\u7684\u9501\u5b9a\u673a\u5236\uff0c\u5f00\u53d1\u8005\u53ef\u4ee5\u6839\u636e\u5b9e\u9645\u60c5\u51b5\u9009\u62e9\u5408\u9002\u7684\u9501\u5b9a\u65b9\u5f0f\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u4f7f\u7528\u884c\u7ea7\u9501\u7684\u793a\u4f8b\uff1a<\/p>\n
-- \u5f00\u542f\u4e8b\u52a1\nSTART TRANSACTION;\n\n-- \u4f7f\u7528\u884c\u7ea7\u9501\nSELECT * FROM table_name WHERE id = 1 FOR UPDATE;\n\n-- \u6267\u884c\u66f4\u65b0\u64cd\u4f5c\nUPDATE table_name SET column_name = 'new_value' WHERE id = 1;\n\n-- \u63d0\u4ea4\u4e8b\u52a1\nCOMMIT;<\/pre>\n
2.2 MVCC<\/h4>\n
MVCC\u662fMySQL\u4e2d\u5e38\u7528\u7684\u5e76\u53d1\u63a7\u5236\u65b9\u6cd5\uff0c\u901a\u8fc7\u4fdd\u5b58\u6570\u636e\u7684\u4e0d\u540c\u7248\u672c\u6765\u5b9e\u73b0\u5e76\u53d1\u8bbf\u95ee\u3002\u5728\u8bfb\u53d6\u6570\u636e\u65f6\uff0c\u4e0d\u4f1a\u88ab\u5199\u5165\u4e8b\u52a1\u6240\u4fee\u6539\u7684\u7248\u672c\u6240\u5f71\u54cd\uff0c\u786e\u4fdd\u8bfb\u53d6\u64cd\u4f5c\u7684\u4e00\u81f4\u6027\u3002\u4e0b\u9762\u662f\u4e00\u4e2aMVCC\u7684\u793a\u4f8b\uff1a<\/p>\n
-- \u5f00\u542f\u4e8b\u52a1\nSTART TRANSACTION;\n\n-- \u6267\u884c\u67e5\u8be2\u64cd\u4f5c\nSELECT * FROM table_name WHERE id = 1;\n\n-- \u63d0\u4ea4\u4e8b\u52a1\nCOMMIT;<\/pre>\n
\u7ed3\u8bed<\/h3>\n
MySQL\u4e8b\u52a1\u7684\u9694\u79bb\u7ea7\u522b\u4e0e\u5e76\u53d1\u63a7\u5236\u662f\u6570\u636e\u5e93\u7ba1\u7406\u4e2d\u4e0d\u53ef\u5ffd\u89c6\u7684\u91cd\u8981\u65b9\u9762\uff0c\u6b63\u786e\u5730\u914d\u7f6e\u9694\u79bb\u7ea7\u522b\u548c\u5e76\u53d1\u63a7\u5236\u65b9\u6cd5\u53ef\u4ee5\u63d0\u9ad8\u6570\u636e\u5e93\u7684\u7a33\u5b9a\u6027\u548c\u6027\u80fd\u3002\u901a\u8fc7\u672c\u6587\u7684\u4ecb\u7ecd\u4e0e\u793a\u4f8b\uff0c\u76f8\u4fe1\u8bfb\u8005\u5bf9MySQL\u4e8b\u52a1\u7684\u9694\u79bb\u7ea7\u522b\u4e0e\u5e76\u53d1\u63a7\u5236\u6709\u4e86\u66f4\u6df1\u5165\u7684\u4e86\u89e3\uff0c\u80fd\u591f\u66f4\u597d\u5730\u5e94\u7528\u4e8e\u5b9e\u9645\u9879\u76ee\u4e2d\u3002<\/p>\n
\u4ee5\u4e0a\u5c31\u662f\u5173\u4e8eMySQL\u4e8b\u52a1\u7684\u9694\u79bb\u7ea7\u522b\u4e0e\u5e76\u53d1\u63a7\u5236\u7684\u4ecb\u7ecd\uff0c\u5e0c\u671b\u80fd\u5bf9\u8bfb\u8005\u6709\u6240\u5e2e\u52a9\u3002<\/p>\n
\u5230\u8fd9\u91cc\uff0c\u6211\u4eec\u4e5f\u5c31\u8bb2\u5b8c\u4e86\u300a\u7ba1\u7406MySQL\u4e8b\u52a1\u4e2d\u5e76\u53d1\u548c\u9694\u79bb\u7ea7\u522b\u300b\u7684\u5185\u5bb9\u4e86\u3002\u4e2a\u4eba\u8ba4\u4e3a\uff0c\u57fa\u7840\u77e5\u8bc6\u7684\u5b66\u4e60\u548c\u5de9\u56fa\uff0c\u662f\u4e3a\u4e86\u66f4\u597d\u7684\u5c06\u5176\u8fd0\u7528\u5230\u9879\u76ee\u4e2d\uff0c\u6b22\u8fce\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\uff0c\u5e26\u4f60\u4e86\u89e3\u66f4\u591a\u5173\u4e8emysql,\u5e76\u53d1,\u4e8b\u52a1\u7684\u77e5\u8bc6\u70b9\uff01<\/p>\n
\n
\n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
\u7ba1\u7406MySQL\u4e8b\u52a1\u4e2d\u5e76\u53d1\u548c\u9694\u79bb\u7ea7...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-199732","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/199732","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=199732"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/199732\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=199732"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=199732"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=199732"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}