{"id":61779,"date":"2024-10-13T13:39:18","date_gmt":"2024-10-13T05:39:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/61779\/"},"modified":"2024-10-13T13:39:18","modified_gmt":"2024-10-13T05:39:18","slug":"innodb%ef%bc%8c%e5%bf%ab%e7%85%a7%e8%ae%80%ef%bc%8c%e5%9c%a8rr%e5%92%8crc%e4%b8%8b%e6%9c%89%e4%bd%95%e5%b7%ae%e7%95%b0%ef%bc%9f%ef%bc%88%e5%be%88%e5%a4%9a%e4%ba%ba%ef%bc%8c%e4%bb%a5%e7%82%ba%e8%87%aa","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/61779\/","title":{"rendered":"InnoDB\uff0c\u5feb\u7167\u8b80\uff0c\u5728RR\u548cRC\u4e0b\u6709\u4f55\u5dee\u7570\uff1f\uff08\u5f88\u591a\u4eba\uff0c\u4ee5\u70ba\u81ea\u5df1\u61c2\u4e86&#8230;\uff09"},"content":{"rendered":"<h1 id=\"innodb%ef%bc%8c%e5%bf%ab%e7%85%a7%e8%ae%80%ef%bc%8c%e5%9c%a8rr%e5%92%8crc%e4%b8%8b%e6%9c%89%e4%bd%95%e5%b7%ae%e7%95%b0%ef%bc%9f%ef%bc%88%e5%be%88%e5%a4%9a%e4%ba%ba%ef%bc%8c%e4%bb%a5%e7%82%ba%e8%87%aa-urOQTFnCnD\">InnoDB\uff0c\u5feb\u7167\u8b80\uff0c\u5728RR\u548cRC\u4e0b\u6709\u4f55\u5dee\u7570\uff1f\uff08\u5f88\u591a\u4eba\uff0c\u4ee5\u70ba\u81ea\u5df1\u61c2\u4e86&#8230;\uff09<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cInnoDB \u662f MySQL \u7684\u4e00\u500b\u91cd\u8981\u5b58\u5132\u5f15\u64ce\uff0c\u56e0\u5176\u652f\u6301\u4e8b\u52d9\u3001\u884c\u7d1a\u9396\u5b9a\u548c\u5916\u9375\u7b49\u7279\u6027\u800c\u5ee3\u53d7\u6b61\u8fce\u3002\u5feb\u7167\u8b80\uff08Snapshot Read\uff09\u662f InnoDB \u4e2d\u7684\u4e00\u500b\u91cd\u8981\u6982\u5ff5\uff0c\u5c24\u5176\u5728\u4e0d\u540c\u7684\u9694\u96e2\u7d1a\u5225\u4e0b\uff0c\u5176\u884c\u70ba\u6703\u6709\u6240\u4e0d\u540c\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u5feb\u7167\u8b80\u5728\u53ef\u91cd\u8907\u8b80\uff08Repeatable Read, RR\uff09\u548c\u8b80\u53d6\u5df2\u63d0\u4ea4\uff08Read Committed, RC\uff09\u9694\u96e2\u7d1a\u5225\u4e0b\u7684\u5dee\u7570\u3002<\/p>\n<h2 id=\"%e5%bf%ab%e7%85%a7%e8%ae%80%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-urOQTFnCnD\">\u5feb\u7167\u8b80\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u5feb\u7167\u8b80\u662f\u6307\u5728\u67e5\u8a62\u6642\uff0c\u8cc7\u6599\u5eab\u6703\u8fd4\u56de\u67d0\u4e00\u6642\u523b\u7684\u6578\u64da\u5feb\u7167\uff0c\u800c\u4e0d\u662f\u7576\u524d\u7684\u6578\u64da\u72c0\u614b\u3002\u9019\u610f\u5473\u8457\u5373\u4f7f\u5728\u67e5\u8a62\u904e\u7a0b\u4e2d\uff0c\u5176\u4ed6\u4e8b\u52d9\u5c0d\u6578\u64da\u9032\u884c\u4e86\u4fee\u6539\uff0c\u5feb\u7167\u8b80\u4ecd\u7136\u6703\u8fd4\u56de\u67e5\u8a62\u958b\u59cb\u6642\u7684\u6578\u64da\u72c0\u614b\u3002\u9019\u4e00\u7279\u6027\u4f7f\u5f97\u5feb\u7167\u8b80\u5728\u9ad8\u4f75\u767c\u74b0\u5883\u4e2d\u80fd\u5920\u6709\u6548\u907f\u514d\u9396\u7af6\u722d\u3002<\/p>\n<h2 id=\"%e9%9a%94%e9%9b%a2%e7%b4%9a%e5%88%a5%e6%a6%82%e8%bf%b0-urOQTFnCnD\">\u9694\u96e2\u7d1a\u5225\u6982\u8ff0<\/h2>\n<p>\u5728 SQL \u6a19\u6e96\u4e2d\uff0c\u9694\u96e2\u7d1a\u5225\u5b9a\u7fa9\u4e86\u4e8b\u52d9\u4e4b\u9593\u7684\u53ef\u898b\u6027\u548c\u76f8\u4e92\u5f71\u97ff\u7a0b\u5ea6\u3002\u4e3b\u8981\u6709\u56db\u7a2e\u9694\u96e2\u7d1a\u5225\uff1a<\/p>\n<ul>\n<li>\u8b80\u53d6\u672a\u63d0\u4ea4\uff08Read Uncommitted\uff09<\/li>\n<li>\u8b80\u53d6\u5df2\u63d0\u4ea4\uff08Read Committed\uff09<\/li>\n<li>\u53ef\u91cd\u8907\u8b80\uff08Repeatable Read\uff09<\/li>\n<li>\u5e8f\u5217\u5316\uff08Serializable\uff09<\/li>\n<\/ul>\n<p>\u5728\u9019\u88e1\uff0c\u6211\u5011\u5c07\u91cd\u9ede\u95dc\u6ce8\u8b80\u53d6\u5df2\u63d0\u4ea4\u548c\u53ef\u91cd\u8907\u8b80\u9019\u5169\u500b\u9694\u96e2\u7d1a\u5225\u3002<\/p>\n<h2 id=\"%e5%bf%ab%e7%85%a7%e8%ae%80%e5%9c%a8%e8%ae%80%e5%8f%96%e5%b7%b2%e6%8f%90%e4%ba%a4%ef%bc%88rc%ef%bc%89%e4%b8%8b%e7%9a%84%e8%a1%8c%e7%82%ba-urOQTFnCnD\">\u5feb\u7167\u8b80\u5728\u8b80\u53d6\u5df2\u63d0\u4ea4\uff08RC\uff09\u4e0b\u7684\u884c\u70ba<\/h2>\n<p>\u5728\u8b80\u53d6\u5df2\u63d0\u4ea4\u7684\u9694\u96e2\u7d1a\u5225\u4e0b\uff0c\u5feb\u7167\u8b80\u6703\u8fd4\u56de\u5df2\u63d0\u4ea4\u7684\u6578\u64da\u3002\u9019\u610f\u5473\u8457\u5982\u679c\u4e00\u500b\u4e8b\u52d9\u5728\u67e5\u8a62\u904e\u7a0b\u4e2d\u5c0d\u6578\u64da\u9032\u884c\u4e86\u4fee\u6539\uff0c\u9019\u4e9b\u4fee\u6539\u53ea\u6709\u5728\u4e8b\u52d9\u63d0\u4ea4\u5f8c\uff0c\u624d\u6703\u5c0d\u5f8c\u7e8c\u7684\u5feb\u7167\u8b80\u53ef\u898b\u3002\u9019\u6a23\u7684\u8a2d\u8a08\u53ef\u4ee5\u6709\u6548\u907f\u514d\u300c\u9ad2\u8b80\u300d\u7684\u554f\u984c\u3002<\/p>\n<pre><code>-- \u4e8b\u52d9 A\nSTART TRANSACTION;\nUPDATE users SET balance = balance - 100 WHERE id = 1;\n-- \u4e8b\u52d9 B\nSELECT * FROM users WHERE id = 1; -- \u9019\u88e1\u6703\u770b\u5230\u4e8b\u52d9 A \u63d0\u4ea4\u524d\u7684\u6578\u64da\nCOMMIT; -- \u4e8b\u52d9 A \u63d0\u4ea4\n-- \u4e8b\u52d9 B \u518d\u6b21\u67e5\u8a62\nSELECT * FROM users WHERE id = 1; -- \u73fe\u5728\u6703\u770b\u5230\u4e8b\u52d9 A \u63d0\u4ea4\u5f8c\u7684\u6578\u64da\n<\/code><\/pre>\n<h2 id=\"%e5%bf%ab%e7%85%a7%e8%ae%80%e5%9c%a8%e5%8f%af%e9%87%8d%e8%a4%87%e8%ae%80%ef%bc%88rr%ef%bc%89%e4%b8%8b%e7%9a%84%e8%a1%8c%e7%82%ba-urOQTFnCnD\">\u5feb\u7167\u8b80\u5728\u53ef\u91cd\u8907\u8b80\uff08RR\uff09\u4e0b\u7684\u884c\u70ba<\/h2>\n<p>\u5728\u53ef\u91cd\u8907\u8b80\u7684\u9694\u96e2\u7d1a\u5225\u4e0b\uff0c\u5feb\u7167\u8b80\u7684\u884c\u70ba\u6709\u6240\u4e0d\u540c\u3002\u7576\u4e00\u500b\u4e8b\u52d9\u958b\u59cb\u6642\uff0c\u5b83\u6703\u7372\u5f97\u4e00\u500b\u5feb\u7167\uff0c\u4e26\u5728\u6574\u500b\u4e8b\u52d9\u671f\u9593\u4fdd\u6301\u9019\u500b\u5feb\u7167\u7684\u53ef\u898b\u6027\u3002\u9019\u610f\u5473\u8457\u5373\u4f7f\u5176\u4ed6\u4e8b\u52d9\u5c0d\u6578\u64da\u9032\u884c\u4e86\u4fee\u6539\uff0c\u4e8b\u52d9 A \u4ecd\u7136\u6703\u770b\u5230\u5b83\u958b\u59cb\u6642\u7684\u6578\u64da\u72c0\u614b\uff0c\u9019\u6a23\u53ef\u4ee5\u907f\u514d\u300c\u4e0d\u53ef\u91cd\u8907\u8b80\u300d\u7684\u554f\u984c\u3002<\/p>\n<pre><code>-- \u4e8b\u52d9 A\nSTART TRANSACTION;\nSELECT * FROM users WHERE id = 1; -- \u4e8b\u52d9 A \u7372\u5f97\u5feb\u7167\n-- \u4e8b\u52d9 B\nUPDATE users SET balance = balance + 100 WHERE id = 1; -- \u4e8b\u52d9 B \u4fee\u6539\u6578\u64da\nCOMMIT; -- \u4e8b\u52d9 B \u63d0\u4ea4\n-- \u4e8b\u52d9 A \u518d\u6b21\u67e5\u8a62\nSELECT * FROM users WHERE id = 1; -- \u4ecd\u7136\u6703\u770b\u5230\u4e8b\u52d9 A \u958b\u59cb\u6642\u7684\u6578\u64da\n<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-urOQTFnCnD\">\u7e3d\u7d50<\/h2>\n<p>\u5feb\u7167\u8b80\u5728\u4e0d\u540c\u7684\u9694\u96e2\u7d1a\u5225\u4e0b\u6709\u8457\u660e\u986f\u7684\u5dee\u7570\u3002\u5728\u8b80\u53d6\u5df2\u63d0\u4ea4\uff08RC\uff09\u4e0b\uff0c\u5feb\u7167\u8b80\u53ea\u6703\u8fd4\u56de\u5df2\u63d0\u4ea4\u7684\u6578\u64da\uff0c\u907f\u514d\u4e86\u9ad2\u8b80\u7684\u554f\u984c\uff1b\u800c\u5728\u53ef\u91cd\u8907\u8b80\uff08RR\uff09\u4e0b\uff0c\u5feb\u7167\u8b80\u5247\u4fdd\u6301\u4e86\u4e8b\u52d9\u958b\u59cb\u6642\u7684\u6578\u64da\u72c0\u614b\uff0c\u907f\u514d\u4e86\u4e0d\u53ef\u91cd\u8907\u8b80\u7684\u554f\u984c\u3002\u7406\u89e3\u9019\u4e9b\u5dee\u7570\u5c0d\u65bc\u8a2d\u8a08\u9ad8\u6548\u7684\u8cc7\u6599\u5eab\u61c9\u7528\u81f3\u95dc\u91cd\u8981\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u8cc7\u6599\u5eab\u7ba1\u7406\u6216\u5176\u4ed6\u6280\u8853\u554f\u984c\u6709\u8208\u8da3\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4e86\u89e3\u66f4\u591a\u8cc7\u8a0a\uff0c\u7279\u5225\u662f\u6211\u5011\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u670d\u52d9\uff0c\u70ba\u60a8\u7684\u696d\u52d9\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22InnoDB\u5feb\u7167\u8bfb\u5728RR\u548cRC\u9694\u79bb\u7ea7\u522b\u4e0b\u7684\u5dee\u5f02\uff0c\u63ed\u793a\u5e38\u89c1\u8bef\u89e3\uff0c\u6df1\u5165\u7406\u89e3\u6570\u636e\u5e93\u4e8b\u52a1\u5904\u7406\u3002<\/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-61779","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/61779","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=61779"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/61779\/revisions"}],"predecessor-version":[{"id":61780,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/61779\/revisions\/61780"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=61779"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=61779"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=61779"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}