{"id":10008390,"date":"2024-02-23T15:33:33","date_gmt":"2024-02-23T07:33:33","guid":{"rendered":"https:\/\/blog.itmax.cn\/?p=10008390"},"modified":"2024-02-23T15:33:33","modified_gmt":"2024-02-23T07:33:33","slug":"10%e4%b8%aa%e8%a1%8c%e9%94%81%e3%80%81%e6%ad%bb%e9%94%81%e6%a1%88%e4%be%8b%e2%ad%90%ef%b8%8f24%e5%bc%a0%e5%8a%a0%e9%94%81%e5%88%86%e6%9e%90%e5%9b%be%f0%9f%9a%80%e5%bd%bb%e5%ba%95%e6%90%9e%e6%87%82inno","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10008390","title":{"rendered":"10\u4e2a\u884c\u9501\u3001\u6b7b\u9501\u6848\u4f8b\u2b50\ufe0f24\u5f20\u52a0\u9501\u5206\u6790\u56fe\ud83d\ude80\u5f7b\u5e95\u641e\u61c2Innodb\u884c\u9501\u52a0\u9501\u89c4\u5219\uff01"},"content":{"rendered":"<h2>10\u4e2a\u884c\u9501\u3001\u6b7b\u9501\u6848\u4f8b\u2b50\ufe0f24\u5f20\u52a0\u9501\u5206\u6790\u56fe\ud83d\ude80\u5f7b\u5e95\u641e\u61c2Innodb\u884c\u9501\u52a0\u9501\u89c4\u5219\uff01<\/h2>\n<p><a target=\"_blank\" href=\"https:\/\/link.segmentfault.com\/?enc=eWiML0RgAsh%2FvrgTqtWd0A%3D%3D.VceDKb1Fxb%2BrFRGSh5hhaD9UtHQZhLza2jb0Y23DgKXqSfvcaS7bp%2FnyP0JTo92U\" rel=\"noopener noreferrer\">\u4e0a\u7bc7\u6587\u7ae0<\/a> \u6211\u4eec\u63cf\u8ff0\u539f\u5b50\u6027\u4e0e\u9694\u79bb\u6027\u7684\u5b9e\u73b0\uff0c\u5176\u4e2d\u63cf\u8ff0\u8bfb\u64cd\u4f5c\u89e3\u51b3\u9694\u79bb\u6027\u95ee\u9898\u7684\u65b9\u6848\u65f6\u8fd8\u9057\u7559\u4e86\u4e00\u4e2a\u95ee\u9898\uff1a\u5199\u64cd\u4f5c\u662f\u5982\u4f55\u89e3\u51b3\u4e0d\u540c\u7684\u9694\u79bb\u6027\u95ee\u9898\uff1f<\/p>\n<p>\u672c\u7bc7\u6587\u7ae0\u5c06\u4f1a\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u5e76\u63cf\u8ff0MySQL\u4e2d\u7684\u9501\u3001\u603b\u7ed3Innodb\u4e2d\u884c\u9501\u52a0\u9501\u89c4\u5219\u3001\u5217\u4e3e\u884c\u9501\u3001\u6b7b\u9501\u6848\u4f8b\u5206\u6790\u7b49<\/p>\n<p>\u518d\u9605\u8bfb\u672c\u7bc7\u6587\u7ae0\u524d\uff0c\u81f3\u5c11\u8981\u7406\u89e3\u67e5\u8be2\u4f7f\u7528\u7d22\u5f15\u7684\u6d41\u7a0b\u3001mvcc\u7b49\u77e5\u8bc6\uff08\u4e0d\u7406\u89e3\u7684\u540c\u5b66\u53ef\u4ee5\u6839\u636e\u4e13\u680f\u987a\u5e8f\u8fdb\u884c\u9605\u8bfb\uff09<\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044643887\" alt=\"image-20240219150520718\" title=\"image-20240219150520718\"><\/p>\n<h3>MySQL\u9501\u7684\u5206\u7c7b<\/h3>\n<blockquote><p>\u4ece\u9501\u7684\u4f5c\u7528\u57df\u4e0a\u5212\u5206:\u5168\u5c40\u9501\u3001\u8868\u9501\u3001\u9875\u9501\u3001\u884c\u9501<\/p><\/blockquote>\n<ol>\n<li>\u5168\u5c40\u9501\uff1a\u9501\u6574\u4e2a\u6570\u636e\u5e93\u5b9e\u4f8b\uff0c\u5e38\u7528\u6570\u636e\u5907\u4efd\uff0c\u7981\u6b62\u5168\u5c40\u5199\uff0c\u53ea\u5141\u8bb8\u8bfb<\/li>\n<li>\n<p>\u8868\u9501\uff1a\u9501\u8868\uff0c\u5bf9\u8868\u8fdb\u884c\u52a0\u9501<\/p>\n<ul>\n<li>\u5143\u6570\u636e\u9501\uff1a\u8868\u7ed3\u6784\u4fee\u6539\u65f6<\/li>\n<li>\u8868X\u9501\uff1a\u8868\u72ec\u5360\u9501<\/li>\n<li>\u8868S\u9501\uff1a\u8868\u5171\u4eab\u9501<\/li>\n<\/ul>\n<\/li>\n<li>\u9875\u9501\uff1a\u4f4d\u4e8e\u8868\u9501\u4e0e\u884c\u9501\u4e2d\u95f4\u4f5c\u7528\u57df\u7684\u9501<\/li>\n<li>\u884c\u9501(innodb\u7279\u6709)\uff1a\u9501\u8bb0\u5f55\uff0c\u5176\u4e2d\u5305\u542b\u72ec\u5360\u9501\uff08\u5199\u9501\uff0cX\u9501\uff09\u548c\u5171\u4eab\u9501\uff08\u8bfb\u9501\uff0cS\u9501\uff09<\/li>\n<\/ol>\n<blockquote><p>\u4ece\u529f\u80fd\u4e0a\u5212\u5206\uff1a\u610f\u5411\u9501\u3001\u63d2\u5165\u610f\u5411\u9501\u3001\u81ea\u589e\u957f\u9501\u3001\u60b2\u89c2\u9501\u3001\u4e50\u89c2\u9501&#8230;<\/p><\/blockquote>\n<ol>\n<li>\n<p>\u610f\u5411\u9501\uff1a\u8868\u9501\uff0c\u8868\u793a\u6709\u610f\u5411\u5f80\u8868\u4e2d\u52a0\u9501\uff0c\u83b7\u53d6\u884c\u9501\u524d\u4f1a\u52a0\u610f\u5411\u9501\uff0c\u5f53\u9700\u8981\u52a0\u8868\u9501\u65f6\uff0c\u8981\u901a\u8fc7\u610f\u5411\u9501\u5224\u65ad\u8868\u4e2d\u662f\u5426\u6709\u884c\u9501<\/p>\n<ul>\n<li>\u72ec\u5360\u610f\u5411\u9501 IX\uff1a\u610f\u5411\u5f80\u8868\u4e2d\u52a0X\u9501\uff0c\u517c\u5bb9IX\u3001IS\uff0c\u4e0d\u517c\u5bb9X\u3001S\uff08\u8868\u7ea7\u522b\uff09<\/li>\n<li>\u5171\u4eab\u610f\u5411\u9501 IS\uff1a\u610f\u5411\u5f80\u8868\u4e2d\u52a0S\u9501\uff0c\u517c\u5bb9IX\u3001IS\u3001S\uff0c\u4e0d\u517c\u5bb9X\uff08\u8868\u7ea7\u522b\uff09<\/li>\n<\/ul>\n<\/li>\n<li>\u63d2\u5165\u610f\u5411\u9501\uff1a\u9690\u5f0f\u9501\uff0c\u610f\u5411\u5f80\u8868\u4e2d\u63d2\u5165\u8bb0\u5f55<\/li>\n<li>\u81ea\u589e\u957f\u9501\uff1a\u9690\u5f0f\u9501\uff0c\u5728\u5e76\u53d1\u573a\u666f\u4e0b\u4e0d\u786e\u5b9a\u63d2\u5165\u6570\u91cf\u4f1a\u4f7f\u7528\u81ea\u589e\u957f\u9501\u52a0\u9501\u751f\u6210\u81ea\u589e\u503c\uff0c\u5982\u679c\u786e\u5b9a\u5219\u4f7f\u7528\u4e92\u65a5\u9501\uff08\u8fde\u7eed\u6a21\u5f0f\uff09<\/li>\n<li>\u60b2\u89c2\u9501\uff1a\u60b2\u89c2\u9501\u53ef\u4ee5\u7528\u52a0\u884c\u9501\u5b9e\u73b0<\/li>\n<li>\u4e50\u89c2\u9501\uff1a\u4e50\u89c2\u9501\u53ef\u4ee5\u7528\u7248\u672c\u53f7\u5224\u65ad\u5b9e\u73b0<\/li>\n<\/ol>\n<p>\u8fd9\u4e9b\u9501\u6709\u4e9b\u662fMySQL\u63d0\u4f9b\u7684\uff0c\u6709\u4e9b\u662f\u5b58\u50a8\u5f15\u64ce\u63d0\u4f9b\u7684\uff0c\u6bd4\u5982Innodb\u652f\u6301\u7684\u884c\u9501\u7c92\u5ea6\u5c0f\uff0c\u5e76\u53d1\u6027\u80fd\u9ad8\uff0c\u4e0d\u6613\u51b2\u7a81<\/p>\n<p>\u4f46\u5728\u67d0\u4e9b\u573a\u666f\u4e0b\u884c\u9501\u8fd8\u662f\u4f1a\u53d1\u751f\u51b2\u7a81\uff08\u963b\u585e\uff09\uff0c\u56e0\u6b64\u6211\u4eec\u9700\u8981\u6df1\u5165\u638c\u63e1\u884c\u9501\u7684\u52a0\u9501\u89c4\u5219\u624d\u80fd\u5728\u9047\u5230\u8fd9\u79cd\u573a\u666f\u65f6\u5206\u6790\u51fa\u95ee\u9898<\/p>\n<h3>Innodb\u7684\u884c\u9501\u52a0\u9501\u89c4\u5219<\/h3>\n<p>\u524d\u9762\u8bf4\u5230\u884c\u9501\u5206\u4e3a\u72ec\u5360\u9501 X\u9501\u548c\u5171\u4eab\u9501 S\u9501\uff0c\u884c\u9501\u9664\u4e86\u4f1a\u4f7f\u7528\u8fd9\u79cd\u6a21\u578b\u5916\uff0c\u8fd8\u4f1a\u4f7f\u7528\u5230\u4e00\u4e9b\u5176\u4ed6\u7684\u6a21\u578b<\/p>\n<h4>\u9501\u6a21\u578b<\/h4>\n<p><strong>record\uff1a\u8bb0\u5f55\u9501\uff0c\u7528\u4e8e\u9501\u5b9a\u67d0\u6761\u8bb0\u5f55<\/strong> \u6a21\u578b\u4f7f\u7528S\/X \uff08\u4e5f\u5c31\u662f\u72ec\u5360\u9501\u3001\u5171\u4eab\u9501\uff09<\/p>\n<p><strong>gap\uff1a\u95f4\u9699\u9501\uff0c\u7528\u4e8e\u9501\u5b9a\u67d0\u4e24\u6761\u8bb0\u5f55\u4e4b\u95f4\uff0c\u7981\u6b62\u63d2\u5165\uff0c\u7528\u4e8e\u9632\u6b62\u5e7b\u8bfb<\/strong> \u6a21\u578b\u4f7f\u7528GAP<\/p>\n<p><strong>next key\uff1a\u4e34\u952e\u9501\uff0c\u76f8\u5f53\u4e8e\u8bb0\u5f55\u9501 + \u95f4\u9699\u9501<\/strong> \u6a21\u578b\u4f7f\u7528X\/S\uff0cGAP<\/p>\n<p>\u5728lock mode\u4e2d\u5e38\u7528X\u6216S\u4ee3\u8868\u72ec\u5360\/\u5171\u4eab\u7684record\uff0cGAP\u5219\u4e0d\u5206X\u6216S<\/p>\n<p>\u5982\u679c\u662f\u72ec\u5360\u7684\u4e34\u952e\u9501\u5219\u662fX\u3001GAP\uff0c\u5171\u4eab\u7684\u4e34\u952e\u9501\u5219\u662fS\u3001GAP<\/p>\n<p>\uff08\u8fd9\u4e2alock mode\u540e\u9762\u6848\u4f8b\u65f6\u4f1a\u7528\u5230\uff0c\u8868\u793a\u5f53\u524dSQL\u88ab\u54ea\u79cd\u9501\u6a21\u578b\u963b\u585e\uff09<\/p>\n<h4>\u4e0d\u540c\u9694\u79bb\u7ea7\u522b\u4e0b\u7684\u52a0\u9501<\/h4>\n<p><strong>\u52a0\u9501\u7684\u76ee\u7684\u5c31\u662f\u4e3a\u4e86\u80fd\u591f\u6ee1\u8db3\u4e8b\u52a1\u9694\u79bb\u6027\u4ece\u800c\u8fbe\u5230\u6570\u636e\u7684\u4e00\u81f4\u6027<\/strong><\/p>\n<p>\u5728<strong>\u4e0d\u540c\u9694\u79bb\u7ea7\u522b\u3001\u4f7f\u7528\u4e0d\u540c\u7c7b\u578bSQL\uff08\u589e\u5220\u6539\u67e5\uff09\u3001\u8d70\u4e0d\u540c\u7d22\u5f15\uff08\u4e3b\u952e\u548c\u975e\u4e3b\u952e\u3001\u552f\u4e00\u548c\u975e\u552f\u4e00\uff09\u3001\u67e5\u8be2\u6761\u4ef6\uff08\u7b49\u503c\u67e5\u8be2\u3001\u8303\u56f4\u67e5\u8be2\uff09\u3001MySQL\u7248\u672c<\/strong> \u7b49\u8bf8\u591a\u56e0\u7d20\u90fd\u4f1a\u5bfc\u81f4\u52a0\u9501\u7684\u7ec6\u8282\u53d1\u751f\u53d8\u5316<\/p>\n<p>\u56e0\u6b64\u53ea\u9700\u8981\u5927\u81f4\u638c\u63e1\u52a0\u9501\u89c4\u5219\uff0c\u5e76\u7ed3\u5408\u53d1\u751f\u963b\u585e\u7684\u8bb0\u5f55\u6392\u67e5\u51fa\u53d1\u751f\u963b\u585e\u7684\u95ee\u9898\uff0c\u518d\u8fdb\u884c\u4f18\u5316\u3001\u89e3\u51b3\u5373\u53ef\uff08\u672c\u6587\u57fa\u4e8e5.7.X\uff09<\/p>\n<p><strong>\u5728RU\uff08Read Uncommitted\uff09\u4e0b\uff0c\u8bfb\u4e0d\u52a0\u9501\uff0c\u5199\u4f7f\u7528X record\uff0c\u7531\u4e8e\u5199\u4f7f\u7528X record \u5219\u4e0d\u4f1a\u4ea7\u751f\u810f\u5199\uff0c\u4f1a\u4ea7\u751f\u810f\u8bfb\u3001\u4e0d\u53ef\u91cd\u590d\u8bfb\u3001\u5e7b\u8bfb\uff0c<\/strong><\/p>\n<p><strong>\u5728RC\uff08Read Committed\uff09\u4e0b\uff0c\u8bfb\u4f7f\u7528mvcc\uff08\u6bcf\u6b21\u8bfb\u751f\u6210read view\uff09\uff0c\u5199\u4f7f\u7528X record\uff0c\u4e0d\u4f1a\u4ea7\u751f\u810f\u5199\u3001\u810f\u8bfb\uff0c\u4f46\u4f1a\u6709\u4e0d\u53ef\u91cd\u590d\u8bfb\u548c\u5e7b\u8bfb<\/strong><\/p>\n<p><strong>\u5728RR\uff08Repeatable Read\uff09\u4e0b\uff0c\u8bfb\u4f7f\u7528mvcc\uff08\u7b2c\u4e00\u6b21\u8bfb\u751f\u6210read view\uff09\uff0c\u5199\u4f7f\u7528X next key\uff0c\u4e0d\u4f1a\u4ea7\u751f\u810f\u5199\u3001\u810f\u8bfb\u3001\u4e0d\u53ef\u91cd\u590d\u8bfb\u548c\u5927\u90e8\u5206\u5e7b\u8bfb\uff0c\u6781\u7aef\u573a\u666f\u7684\u5e7b\u8bfb\u4f1a\u4ea7\u751f<\/strong><\/p>\n<p><strong>\u5728S\uff08Serializable\uff09\u4e0b\uff0c\u81ea\u52a8\u63d0\u4ea4\u60c5\u51b5\u4e0b\u8bfb\u4f7f\u7528mvcc\uff0c\u624b\u52a8\u63d0\u4ea4\u4e0b\u8bfb\u4f7f\u7528S next key\uff0c\u5199\u4f7f\u7528X next key\uff0c\u4e0d\u4f1a\u4ea7\u751f\u810f\u5199\u3001\u810f\u8bfb\u3001\u4e0d\u53ef\u91cd\u590d\u8bfb\u3001\u5e7b\u8bfb<\/strong><\/p>\n<p>\u5728\u5e38\u7528\u7684\u9694\u79bb\u7ea7\u522bRC\u3001RR\u4e2d\uff0c\u8bfb\u90fd\u662f\u4f7f\u7528mvcc\u673a\u5236\uff08\u4e0d\u52a0\u9501\uff09\u6765\u63d0\u9ad8\u5e76\u53d1\u6027\u80fd\u7684<\/p>\n<h4>\u9501\u5b9a\u8bfb\u7684\u52a0\u9501<\/h4>\n<p>\u5728S\u4e32\u884c\u5316\u4e0b\uff0c\u8bfb\u4f1a\u52a0S\u9501\uff0c\u90a3select\u5982\u4f55\u52a0\u9501\u5462?<\/p>\n<p>S\u9501\uff1a<code>select ... lock in share mode<\/code><\/p>\n<p>X\u9501\uff1a<code>select ... for update<\/code><\/p>\n<p>\u901a\u5e38\u628a\u52a0\u9501\u7684select\u79f0\u4e3a\u9501\u5b9a\u8bfb\uff0c\u800c\u5728\u666e\u901a\u7684update\u548cdelete\u65f6\uff0c\u9700\u8981\u5148\u8fdb\u884c\u8bfb\uff08\u627e\u5230\u8bb0\u5f55\uff09\u518d\u64cd\u4f5c\uff0c\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\u52a0\u9501\u89c4\u5219\u4e5f\u53ef\u4ee5\u5f52\u4e3a\u9501\u5b9a\u8bfb<\/p>\n<p>update\u4e0edelete\u662f\u5199\u64cd\u4f5c\uff0c\u80af\u5b9a\u662f\u52a0X\u9501\u7684<\/p>\n<p>\uff08\u4ee5\u4e0b\u9501\u5b9a\u8bfb\u548c\u65b0\u589e\u7684\u52a0\u9501\u89c4\u5219\u662f\u603b\u7ed3\uff0c\u642d\u914d\u6848\u4f8b\u67e5\u770b\uff0c\u4e00\u5f00\u59cb\u770b\u4e0d\u61c2\u4e0d\u8981\u7d27~\uff09<\/p>\n<blockquote><p>\u9501\u5b9a\u8bfb\u52a0\u9501\u89c4\u5219<\/p><\/blockquote>\n<ol>\n<li>\n<p><strong>\u5728RC\u53ca\u4ee5\u4e0b\u9694\u79bb\u7ea7\u522b\uff0c\u9501\u5b9a\u8bfb\u4f7f\u7528record\u9501\uff1b\u5728RR\u53ca\u4ee5\u4e0a\u9694\u79bb\u7ea7\u522b\uff0c\u9501\u5b9a\u8bfb\u4f7f\u7528next key\u9501<\/strong> \uff08\u95f4\u9699\u9501\u7684\u8303\u56f4\u662f\u524d\u5f00\u540e\u95ed\uff0c\u6848\u4f8b\u8be6\u7ec6\u63cf\u8ff0\uff09<\/p>\n<p>\uff08\u5177\u4f53S\u3001X\u9501\u5219\u770bSQL\uff0c\u5982\u679c\u662f <code>select ... lock in share mode<\/code> \u5219\u662fS\u9501\uff0c\u5982\u679c\u662f <code>select ... for update<\/code>\u3001<code>update ...<\/code>\u3001<code>delete ...<\/code> \u5219\u662fX\u9501\uff09<\/p>\n<\/li>\n<li><strong>\u7b49\u503c\u67e5\u8be2\uff1a\u5982\u679c\u627e\u4e0d\u5230\u8bb0\u5f55\uff0c\u8be5\u67e5\u8be2\u6761\u4ef6\u6240\u5728\u533a\u95f4\u52a0GAP\u9501\uff1b\u5982\u679c\u627e\u5230\u8bb0\u5f55\uff0c\u552f\u4e00\u7d22\u5f15\u4e34\u952e\u9501\u9000\u5316\u4e3a\u8bb0\u5f55\u9501\uff0c\u975e\u552f\u4e00\u7d22\u5f15\u9700\u8981\u626b\u63cf\u5230\u7b2c\u4e00\u6761\u4e0d\u6ee1\u8db3\u6761\u4ef6\u7684\u8bb0\u5f55\uff0c\u6700\u540e\u4e34\u952e\u9501\u9000\u5316\u4e3a\u95f4\u9699\u9501\uff08\u4e0d\u5728\u6700\u540e\u4e00\u6761\u4e0d\u6ee1\u8db3\u6761\u4ef6\u7684\u8bb0\u5f55\u4e0a\u52a0\u8bb0\u5f55\u9501\uff09<\/strong><\/li>\n<li><strong>\u8303\u56f4\u67e5\u8be2\uff1a\u975e\u552f\u4e00\u7d22\u5f15\u9700\u8981\u626b\u63cf\u5230\u7b2c\u4e00\u6761\u4e0d\u6ee1\u8db3\u6761\u4ef6\u7684\u8bb0\u5f55<\/strong>\uff085.7\u4e2d\u552f\u4e00\u7d22\u5f15\u4e5f\u4f1a\u626b\u63cf\u7b2c\u4e00\u6761\u4e0d\u6ee1\u8db3\u6761\u4ef6\u7684\u8bb0\u5f558.0\u4fee\u590d\uff0c\u540e\u6587\u63cf\u8ff0\uff09<\/li>\n<li>\n<p><strong>\u5728\u67e5\u627e\u7684\u8fc7\u7a0b\u4e2d\uff0c\u4f7f\u7528\u5230\u4ec0\u4e48\u7d22\u5f15\u5c31\u5728\u90a3\u4e2a\u7d22\u5f15\u4e0a\u52a0\u9501\uff0c\u904d\u5386\u5230\u54ea\u6761\u8bb0\u5f55\u5c31\u7ed9\u54ea\u6761\u5148\u52a0\u9501<\/strong><\/p>\n<p>\uff08\u67e5\u627e\u65f6\u8d70\u4e8c\u7ea7\u7d22\u5f15\uff0c\u5982\u679c\u8981\u56de\u8868\u67e5\u805a\u7c07\u7d22\u5f15\uff0c\u5219\u8fd8\u4f1a\u5728\u805a\u7c07\u7d22\u5f15\u4e0a\u52a0\u9501\uff09<\/p>\n<p>\uff08\u4fee\u6539\u65f6\u5982\u679c\u4e8c\u7ea7\u7d22\u5f15\u4e0a\u4e5f\u5b58\u5728\u8981\u4fee\u6539\u7684\u503c\uff0c\u5219\u8fd8\u8981\u53bb\u4e8c\u7ea7\u7d22\u5f15\u4e2d\u67e5\u627e\u52a0\u9501\u5e76\u4fee\u6539\uff09<\/p>\n<\/li>\n<li><strong>\u5728RC\u53ca\u4ee5\u4e0b\u9694\u79bb\u7ea7\u522b\u4e0b\uff0c\u67e5\u627e\u8fc7\u7a0b\u4e2d\u5982\u679c\u8bb0\u5f55\u4e0d\u6ee1\u8db3\u5f53\u524d\u67e5\u8be2\u6761\u4ef6\u5219\u4f1a\u91ca\u653e\u9501\uff1b\u5728RR\u53ca\u4ee5\u4e0a\u65e0\u8bba\u662f\u5426\u6ee1\u8db3\u67e5\u8be2\u6761\u4ef6\uff0c\u53ea\u8981\u904d\u5386\u8fc7\u8bb0\u5f55\u5c31\u4f1a\u52a0\u9501\uff0c\u76f4\u5230\u4e8b\u52a1\u63d0\u4ea4\u624d\u91ca\u653e<\/strong>\uff08RR\u53ca\u4ee5\u4e0a\u83b7\u53d6\u9501\u7684\u65f6\u95f4\u4f1a\u66f4\u957f\uff09<\/li>\n<\/ol>\n<h4>\u65b0\u589e\u7684\u52a0\u9501<\/h4>\n<p>\u524d\u9762\u8bf4\u5230update\u3001delete\u8fd9\u79cd\u5148\u67e5\u518d\u5199\u7684\u64cd\u4f5c\u53ef\u4ee5\u770b\u6210\u52a0X\u9501\u7684\u9501\u5b9a\u8bfb\uff0c\u800cselect\u7684\u9501\u5b9a\u8bfb\u5206\u4e3aS\u3001X\uff0c\u8fd8\u5269insert\u7684\u89c4\u5219\u6ca1\u6709\u8bf4\u660e<\/p>\n<blockquote><p>\u65b0\u589e\u52a0\u9501\u89c4\u5219<\/p><\/blockquote>\n<p>\u65b0\u589e\u52a0\u9501\u89c4\u5219\u5206\u4e3a\u4e09\u79cd\u60c5\u51b5\uff1a<strong>\u6b63\u5e38\u60c5\u51b5\u3001\u9047\u5230\u91cd\u590d\u51b2\u7a81\u7684\u60c5\u51b5\u3001\u5916\u952e\u60c5\u51b5<\/strong><\/p>\n<p>\u65b0\u589e\u65f6\u52a0\u7684\u9501\u53eb\u63d2\u5165\u610f\u5411\u9501\uff0c\u5b83\u662f\u9690\u5f0f\u9501<\/p>\n<p>\u5f53\u522b\u7684\u4e8b\u52a1\u60f3\u8981\u83b7\u53d6\u8be5\u8bb0\u5f55\u7684X\/S\u9501\u65f6\uff0c\u67e5\u770b\u8be5\u8bb0\u5f55\u7684\u4e8b\u52a1id\u662f\u4e0d\u662f\u6d3b\u8dc3\u4e8b\u52a1\uff0c\u5982\u679c\u6d3b\u8dc3\uff08\u4e8b\u52a1\u672a\u63d0\u4ea4\uff09\u5219\u4f1a\u5e2e\u65b0\u589e\u8bb0\u5f55\u7684\u4e8b\u52a1\u751f\u6210\u9501\u7ed3\u6784\uff0c\u6b64\u65f6\u63d2\u5165\u610f\u5411\u9501\u53d8\u6210\u663e\u793a\u9501\uff08\u53ef\u4ee5\u770b\u6210X\u9501\uff09<\/p>\n<p><strong>\u6b63\u5e38\u60c5\u51b5\u4e0b\u52a0\u9501\uff1a<\/strong><\/p>\n<ol>\n<li><strong>\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u63d2\u5165\u4f7f\u7528\u9690\u5f0f\u9501\uff08\u63d2\u5165\u610f\u5411\u9501\uff09\uff0c\u4e0d\u751f\u6210\u9501\u7ed3\u6784<\/strong><\/li>\n<li><strong>\u5f53\u63d2\u5165\u610f\u5411\u9501\uff08\u9690\u5f0f\u9501\uff09\u88ab\u5176\u4ed6\u4e8b\u52a1\u751f\u6210\u9501\u7ed3\u6784\u65f6\u53d8\u4e3a\u663e\u793a\u9501\uff08X record\uff09<\/strong><\/li>\n<\/ol>\n<p><strong>\u91cd\u590d\u51b2\u7a81\u52a0\u9501\uff1a<\/strong><\/p>\n<ol>\n<li><strong>\u5f53insert\u9047\u5230\u91cd\u590d\u4e3b\u952e\u51b2\u7a81\u65f6\uff0cRC\u53ca\u4ee5\u4e0b\u52a0S record\uff0cRR\u53ca\u4ee5\u4e0a\u52a0S next key<\/strong><\/li>\n<li>\n<p><strong>\u5f53insert\u9047\u5230\u91cd\u590d\u552f\u4e00\u4e8c\u7ea7\u7d22\u5f15\u65f6\uff0c\u52a0S next key<\/strong><\/p>\n<p><strong>\u5982\u679c\u4f7f\u7528 <code>ON DUPLICATE KEY update<\/code> \u90a3\u4e48S\u9501\u4f1a\u6362\u6210X\u9501<\/strong><\/p>\n<\/li>\n<\/ol>\n<p>\u5916\u952e\u52a0\u9501\uff1a\u4e00\u822c\u4e0d\u505a\u7269\u7406\u5916\u952e\uff0c\u7565&#8230;<\/p>\n<h3>\u884c\u9501\u6848\u4f8b\u5206\u6790<\/h3>\n<h4>\u642d\u5efa\u73af\u5883<\/h4>\n<p>\u5148\u5efa\u7acb\u4e00\u5f20\u6d4b\u8bd5\u8868\uff0c\u5176\u4e2did\u4e3a\u4e3b\u952e\uff0c\u4ee5s\/_name\u5efa\u7acb\u7d22\u5f15<\/p>\n<pre><code class=\"sql\">CREATE TABLE `s` (\n  `id` int(11) NOT NULL,\n  `s_name` varchar(255) DEFAULT NULL,\n  `s_age` varchar(255) DEFAULT NULL,\n  PRIMARY KEY (`id`),\n  KEY `name_idx` (`s_name`)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8;<\/code><\/pre>\n<p>\u518d\u63d2\u5165\u4e00\u4e9b\u8bb0\u5f55<\/p>\n<pre><code class=\"sql\">INSERT INTO `s` (`id`, `s_name`, `s_age`) VALUES (1, 'juejin', '1');\nINSERT INTO `s` (`id`, `s_name`, `s_age`) VALUES (10, 'nb', '10');\nINSERT INTO `s` (`id`, `s_name`, `s_age`) VALUES (20, 'caicai\u83dc\u83dc', '20');\nINSERT INTO `s` (`id`, `s_name`, `s_age`) VALUES (25, 'ai', '25');<\/code><\/pre>\n<p>\u805a\u7c07\u7d22\u5f15\u548cs\/_name\u7d22\u5f15\u7684\u5b58\u50a8\u56fe\u50cf\u7b80\u5316\u6210\u5982\u4e0b\uff1a<\/p>\n<p><img decoding=\"async\" width=\"723\" height=\"295\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdbt4r\" alt=\"image-20240121131811808.png\" title=\"image-20240121131811808.png\" loading=\"lazy\"><br \/>\u524d\u9762\u8bf4\u8fc7GAP\u9700\u8981\u52a0\u5728\u8bb0\u5f55\u4e4b\u95f4\uff0c\u5982\u679c\u662f\u7b2c\u4e00\u6761\u8bb0\u5f55\u6216\u8005\u6700\u540e\u4e00\u6761\u8bb0\u5f55\u8981\u9632\u6b62\u63d2\u5165\uff0c\u8be5\u5982\u4f55\u52a0GAP\u9501\u5462\uff1f<\/p>\n<p>Infimum\u548cSupremum\u7684\u51fa\u73b0\u5c31\u80fd\u591f\u89e3\u51b3\u8fd9\u79cd\u95ee\u9898\uff0c\u5b83\u4eec\u7528\u4e8e\u6807\u8bc6\u6bcf\u9875\u7684\u6700\u5c0f\u503c\u548c\u6700\u5927\u503c<\/p>\n<p>\u6ce8\u610f\uff1a\u7531\u4e8eRC\u3001RR\u662f\u5e38\u7528\u7684\u9694\u79bb\u7ea7\u522b\uff0c\u6848\u4f8b\u4e5f\u662f\u4f7f\u7528\u8fd9\u4e24\u79cd\u9694\u79bb\u7ea7\u522b\u8fdb\u884c\u8bf4\u660e<\/p>\n<h4>\u5206\u6790\u65b9\u6cd5<\/h4>\n<p>\u53ef\u4ee5\u901a\u8fc7\u7cfb\u7edf\u5e93\u67e5\u770b\u884c\u9501\u963b\u585e\u7684\u76f8\u5173\u4fe1\u606f<\/p>\n<p>5.7 \u963b\u585e\u7684\u9501\u3001\u4e8b\u52a1\u7b49\u4fe1\u606f\u5728information\/_schema\u5e93\u4e2d\u7684innodb\/_locks\u3001innodb\/_lock\/_waits\u3001innodb\/_trx\u7b49\u8868<\/p>\n<p>8.0 \u7684\u76f8\u5173\u4fe1\u606f\u5219\u662f\u5728performance\/_schema\u5e93\u4e2d<\/p>\n<blockquote><p>lock\u8bb0\u5f55\u4fe1\u606f\u7b80\u4ecb<\/p><\/blockquote>\n<p><img decoding=\"async\" width=\"723\" height=\"67\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdbt4s\" alt=\"image-20240119113504300.png\" title=\"image-20240119113504300.png\" loading=\"lazy\"><br \/>lock\/_id \u9501id \u7531\u4e8b\u52a1id\u3001\u5b58\u50a8\u4fe1\u606f\u7ec4\u6210 \u4f1a\u53d8\u52a8<\/p>\n<p>lock\/_trx\/_id \u4e8b\u52a1ID 42388\u4e3a\u5148\u5f00\u542f\u7684\u4e8b\u52a1 \uff08\u4e8b\u52a1ID\u5168\u5c40\u81ea\u589e\uff09<\/p>\n<p>lock\/_mode \u963b\u585e\u7684\u9501\u4e3aX\u9501\uff0c\u8fd8\u6709\u5176\u4ed6\u6a21\u5f0f\uff1aS\u3001X\u3001IS\u3001IX\u3001GAP\u3001AUTO\/_INC\u7b49<\/p>\n<p>lock\/_type \u9501\u7c7b\u578b\u4e3a\u884c\u9501record \uff0c\u8fd8\u6709\u8868\u9501\uff1atable<\/p>\n<p>lock\/_table \u9501\u7684\u8868 ; lock\/_index \u9501\u7684\u7d22\u5f15 \uff08\u4e8c\u7ea7\u7d22\u5f15\uff09<\/p>\n<p>lock\/_space \u3001page \u3001rec \u9501\u7684\u8868\u7a7a\u95f4id\u3001\u9875\u3001\u5806\u53f7\u7b49\u5b58\u50a8\u4fe1\u606f<\/p>\n<p>lock\/_data \u8868\u793a\u9501\u7684\u6570\u636e\uff0c\u4e00\u822c\u662f\u884c\u8bb0\u5f55 &#8216;caicai\u83dc\u83dc&#8217;,20 (s\/_name,id)<\/p>\n<blockquote><p>\u8fd8\u53ef\u4ee5\u901a\u8fc7\u8054\u8868\u67e5\u8be2\u83b7\u53d6\u884c\u9501\u963b\u585e\u7684\u4fe1\u606f<\/p><\/blockquote>\n<pre><code class=\"sql\">SELECT\n  r.trx_id waiting_trx_id,\n  r.trx_mysql_thread_id waiting_thread,\n  r.trx_query waiting_query,\n    rl.lock_mode waiting_lock_mode,\n    rl.lock_type waiting_lock_type,\n  b.trx_id blocking_trx_id,\n  b.trx_mysql_thread_id blocking_thread,\n  b.trx_query blocking_query,\n    bl.lock_mode blocking_lock_mode,\n    bl.lock_type blocking_lock_type\nFROM       information_schema.innodb_lock_waits w\nINNER JOIN information_schema.innodb_trx b\n  ON b.trx_id = w.blocking_trx_id\nINNER JOIN information_schema.innodb_trx r\n  ON r.trx_id = w.requesting_trx_id\ninner join information_schema.innodb_locks rl\n  on     r.trx_id = rl.lock_trx_id\ninner join information_schema.innodb_locks bl \n  on b.trx_id = bl.lock_trx_id;<\/code><\/pre>\n<p>\u53c8\u6216\u8005\u901a\u8fc7 innodb\u7684\u65e5\u5fd7 \uff08show engine innodb status\uff09\u67e5\u770b\u963b\u585e\u4fe1\u606f&#8230;<\/p>\n<p>\uff08\u540e\u6587\u5206\u6790\u518d\u8bf4\uff09<\/p>\n<h4>\u6848\u4f8b\uff1aRC\u3001RR\u4e0b\u7684\u52a0\u9501<\/h4>\n<table>\n<thead>\n<tr>\n<th align=\"center\"> <\/th>\n<th align=\"center\">T1<\/th>\n<th align=\"center\">T2<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td align=\"center\">1<\/td>\n<td align=\"center\">begin;&lt;br\/&gt;select * from s where id\/&gt;=10 and id&lt;=20 for update;<\/td>\n<td align=\"center\"> <\/td>\n<\/tr>\n<tr>\n<td align=\"center\">2<\/td>\n<td align=\"center\"> <\/td>\n<td align=\"center\">insert into s values (12,&#8217;caicaiJava&#8217;,12);&lt;br\/&gt;(\u963b\u585e)<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">3<\/td>\n<td align=\"center\">commit;<\/td>\n<td align=\"center\"> <\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>T1\u4e8b\u52a1\u572810\uff0c20\u4e4b\u95f4\u4f1a\u52a0GAP\u9501\uff0c\u56e0\u6b64T2\u65b0\u589e\u65f6\u4f1a\u88ab\u963b\u585e<\/p>\n<p><img decoding=\"async\" width=\"723\" height=\"76\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdbt4t\" alt=\"image-20240121110912505.png\" title=\"image-20240121110912505.png\" loading=\"lazy\"><br \/>\u8bbe\u7f6e\u4e3aRC\u540e\u4e0d\u518d\u963b\u585e\uff0c\u56e0\u4e3aRC\u4e0b\u4e0d\u52a0GAP\u9501\u4e0d\u9632\u6b62\u63d2\u5165<\/p>\n<pre><code class=\"sql\">SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED;\nSELECT @@tx_isolation;<\/code><\/pre>\n<p>\u4f46\u5982\u679c\u662f\u8981\u83b7\u53d6\u8bb0\u5f55\u9501\u5219\u8fd8\u662f\u4f1a\u88ab\u963b\u585e \uff08\u4fee\u6539id\u4e3a10\u7684\u8bb0\u5f55 <code>update s set s_name = '666' where id = 10<\/code>\uff09<\/p>\n<p><img decoding=\"async\" width=\"723\" height=\"66\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdbt4u\" alt=\"image-20240121105954377.png\" title=\"image-20240121105954377.png\" loading=\"lazy\"><br \/>\u6839\u636e\u8be5\u6848\u4f8b\u53ef\u4ee5\u8bf4\u660e\u89c4\u5219\u4e00\uff1a<strong>RC\u53ca\u4ee5\u4e0b\u4f7f\u7528\u8bb0\u5f55\u9501\u3001RR\u53ca\u4ee5\u4e0a\u4f7f\u7528\u4e34\u952e\u9501<\/strong><\/p>\n<h4>\u6848\u4f8b\uff1a\u7b49\u503c\u67e5\u8be2<\/h4>\n<blockquote><p>\u7b49\u503c\u67e5\u8be2\uff1a\u5339\u914d\u4e0d\u5230\u6ee1\u8db3\u6761\u4ef6\u7684\u8bb0\u5f55<\/p><\/blockquote>\n<table>\n<thead>\n<tr>\n<th> <\/th>\n<th align=\"center\">T1<\/th>\n<th align=\"center\">T2<\/th>\n<th align=\"center\">T3<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>1<\/td>\n<td align=\"center\">begin;&lt;br\/&gt;select * from s where id=15 for update;<\/td>\n<td align=\"center\"> <\/td>\n<td align=\"center\"> <\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td align=\"center\"> <\/td>\n<td align=\"center\">insert into s values (11,&#8217;caicaiJava11&#8242;,11);&lt;br\/&gt;(\u963b\u585e)<\/td>\n<td align=\"center\"> <\/td>\n<\/tr>\n<tr>\n<td>3<\/td>\n<td align=\"center\"> <\/td>\n<td align=\"center\"> <\/td>\n<td align=\"center\">insert into s values (19,&#8217;caicaiJava11&#8242;,19);&lt;br\/&gt;(\u963b\u585e)<\/td>\n<\/tr>\n<tr>\n<td>4<\/td>\n<td align=\"center\">commit;<\/td>\n<td align=\"center\"> <\/td>\n<td align=\"center\"> <\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u901a\u8fc7\u963b\u585e\u8bb0\u5f55\u53ef\u4ee5\u770b\u5230T2,T3\u4e8b\u52a1\u88ab\u4e3b\u952e\u7d22\u5f15\u4e0a\u6570\u636e\u4e3a20\u7684\u4e34\u952e\u9501\uff08\u7684GAP\uff09\u963b\u585e<\/p>\n<p><img decoding=\"async\" width=\"723\" height=\"177\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdbt4v\" alt=\"image-20240121133606532.png\" title=\"image-20240121133606532.png\" loading=\"lazy\"><br \/><strong>\u7b49\u503c\u67e5\u8be2\u5982\u679c\u5339\u914d\u4e0d\u5230\u503c\u4f1a\u5728\u8be5\u533a\u95f4\u52a0GAP\u9501<\/strong><\/p>\n<p>\u56fe\u4e2d\u5411\u4e0b\u9ed1\u7bad\u5934\u4e3aGAP\u9501<\/p>\n<p><img decoding=\"async\" width=\"723\" height=\"214\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdbt4w\" alt=\"image-20240121133306180.png\" title=\"image-20240121133306180.png\" loading=\"lazy\"><br \/>\u4f8b\u5982T1\u7b49\u503c\u67e5\u8be2id=15\uff0c\u6ca1\u6709id=15\u7684\u8bb0\u5f55\u5219\u4f1a\u52a0\u9501\u572815\u8fd9\u4e2a\u533a\u95f4\u52a0GAP\u9501<\/p>\n<blockquote><p>\u7b49\u503c\u67e5\u8be2\uff1a\u5339\u914d\u5230\u6ee1\u8db3\u6761\u4ef6\u7684\u8bb0\u5f55<\/p><\/blockquote>\n<table>\n<thead>\n<tr>\n<th> <\/th>\n<th align=\"center\">T1<\/th>\n<th align=\"center\">T2<\/th>\n<th align=\"center\">T3<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>1<\/td>\n<td align=\"center\">begin;&lt;br\/&gt;select * from s where id=20 for update;<\/td>\n<td align=\"center\"> <\/td>\n<td align=\"center\"> <\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td align=\"center\"> <\/td>\n<td align=\"center\">insert into s values (15,&#8217;\u83dc\u83dc\u7684\u540e\u7aef\u79c1\u623f\u83dc&#8217;,15);&lt;br\/&gt;(\u4e0d\u963b\u585e)<\/td>\n<td align=\"center\"> <\/td>\n<\/tr>\n<tr>\n<td>3<\/td>\n<td align=\"center\"> <\/td>\n<td align=\"center\"> <\/td>\n<td align=\"center\">update s set s\/_name = &#8216;\u83dc\u83dc\u7684\u540e\u7aef\u79c1\u623f\u83dc&#8217; where id = 20;&lt;br\/&gt;(\u963b\u585e)<\/td>\n<\/tr>\n<tr>\n<td>4<\/td>\n<td align=\"center\">commit;<\/td>\n<td align=\"center\"> <\/td>\n<td align=\"center\"> <\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u56e0\u4e3a\u552f\u4e00\u7d22\u5f15\u4e0a\u76f8\u540c\u7684\u8bb0\u5f55\u53ea\u6709\u4e00\u6761\uff0c\u5f53\u7b49\u503c\u67e5\u8be2\u5339\u914d\u65f6\uff0c\u4e34\u952e\u9501\u4f1a\u9000\u5316\u6210\u8bb0\u5f55\u9501\uff0c\u56e0\u6b64T2\u4e0d\u88ab\u963b\u585e T3\u88ab\u963b\u585e<\/p>\n<p>\u56fe\u4e2d\u4e3aT3\u88ab\u6570\u636e\u4e3a20\u4e0a\u7684X\u9501\u963b\u585e<\/p>\n<p><img decoding=\"async\" width=\"723\" height=\"154\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdbt4x\" alt=\"image-20240121134322398.png\" title=\"image-20240121134322398.png\" loading=\"lazy\"><br \/><strong>\u552f\u4e00\u7d22\u5f15\u7b49\u503c\u67e5\u8be2\u95f4\u9699\u9501\u9000\u5316\u4e3a\u8bb0\u5f55\u9501<\/strong><\/p>\n<p>(\u56fe\u4e2d\u84dd\u8272\u4e3a\u8bb0\u5f55\u9501)<\/p>\n<p><img decoding=\"async\" width=\"723\" height=\"189\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdbt4y\" alt=\"image-20240121134717251.png\" title=\"image-20240121134717251.png\" loading=\"lazy\"><\/p>\n<blockquote><p>\u975e\u552f\u4e00\u7d22\u5f15\u7b49\u503c\u67e5\u8be2<\/p><\/blockquote>\n<table>\n<thead>\n<tr>\n<th> <\/th>\n<th align=\"center\">T1<\/th>\n<th align=\"center\">T2<\/th>\n<th align=\"center\">T3<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>1<\/td>\n<td align=\"center\">begin;&lt;br\/&gt;select s\/_name,id from s where s\/_name=&#8217;caicai\u83dc\u83dc&#8217; for update;<\/td>\n<td align=\"center\"> <\/td>\n<td align=\"center\"> <\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td align=\"center\"> <\/td>\n<td align=\"center\">insert into s values (15,&#8217;bilibili&#8217;,15);&lt;br\/&gt;(\u963b\u585e)<\/td>\n<td align=\"center\"> <\/td>\n<\/tr>\n<tr>\n<td>3<\/td>\n<td align=\"center\"> <\/td>\n<td align=\"center\"> <\/td>\n<td align=\"center\">insert into s values (18,&#8217;da&#8217;,18);&lt;br\/&gt;(\u963b\u585e)<\/td>\n<\/tr>\n<tr>\n<td>4<\/td>\n<td align=\"center\">commit;<\/td>\n<td align=\"center\"> <\/td>\n<td align=\"center\"> <\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u4e3a\u4e86\u786e\u4fdd <code>select s_name,id from s where s_name='caicai\u83dc\u83dc' for update<\/code> \u4f7f\u7528s\/_name\u7d22\u5f15\uff0c\u6211\u5c06\u67e5\u8be2\u5217\u6362\u6210s\/_name\u4e0a\u5b58\u5728\u7684\u5217\uff0c\u907f\u514d\u56de\u8868\uff08\u786e\u4fdd\u4f7f\u7528s\/_name\uff09<\/p>\n<ol>\n<li>\u5148\u5b9a\u4f4d\u5230 <code>s_name='caicai\u83dc\u83dc'<\/code> \u7684\u8bb0\u5f55\uff0c\u52a0\u9501\uff1a(ai,caicai\u83dc\u83dc]<\/li>\n<li>\u7531\u4e8e\u4e0d\u786e\u5b9a\u6ee1\u8db3 <code>s_name='caicai\u83dc\u83dc'<\/code> \u7684\u8bb0\u5f55\u662f\u5426\u6709\u91cd\u590d\uff0c\u4e8e\u662f\u7ee7\u7eed\u540e\u67e5\u8be2\uff0c\u52a0\u9501\uff1a(caicai\u83dc\u83dc\uff0cjuejin]<\/li>\n<li>\u7531\u4e8ejuejin\u4e0d\u6ee1\u8db3\u67e5\u8be2\u6761\u4ef6\uff0c\u4e8e\u662f\u9000\u5316\u4e3a\u95f4\u9699\u9501\uff0c\u52a0\u9501:(caicai\u83dc\u83dc\uff0cjuejin)<\/li>\n<\/ol>\n<p><img decoding=\"async\" width=\"723\" height=\"160\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdbt4z\" alt=\"image-20240121140556218.png\" title=\"image-20240121140556218.png\" loading=\"lazy\"><\/p>\n<p>\u6700\u7ec8\u52a0\u9501\u8303\u56f4 = (ai,caicai\u83dc\u83dc] + (caicai\u83dc\u83dc\uff0cjuejin) = (ai\uff0cjuejin)<\/p>\n<p>(\u6ce8\u610f\uff1a\u6211\u8fd9\u91cc\u7684\u52a0\u9501\u8303\u56f4\u662f\u7b80\u5316\u7684\uff0c\u6ca1\u6709\u5e26\u4e0a\u4e3b\u952e\u4fe1\u606f\uff1b\u5b8c\u6574\u4fe1\u606f\u5982\u4e0b\u56felock\/_data\u4e2d\u7684juejin,1)<\/p>\n<p>\u7136\u540e\u518d\u6765\u5206\u6790T2,T3\u7684\u63d2\u5165\u8bed\u53e5\uff0c\u9996\u5148\u5b83\u4eec\u9700\u8981\u5728\u805a\u7c07\u7d22\u5f15\u548cname\/_idx\u7d22\u5f15\u4e0a\u65b0\u589e\u6570\u636e\uff0c\u7531\u4e8e\u805a\u7c07\u7d22\u5f15\u672a\u52a0\u9501\uff0c\u56e0\u6b64\u4e0d\u5f71\u54cd\u63d2\u5165<\/p>\n<p>\u4f46\u662fname\/_idx\u7d22\u5f15\u4e0a\u5b58\u5728\u9501\uff0cT2\u4e8b\u52a1 bilibili \u4f1a\u63d2\u5165\u5230ai\u548ccaicai\u83dc\u83dc\u8bb0\u5f55\u4e4b\u95f4\uff0cT3\u4e8b\u52a1\u4f1a\u63d2\u5165\u5230caicai\u83dc\u83dc\u548cjuejin\u8fd9\u4e24\u6761\u8bb0\u5f55\u95f4\uff0c\u56e0\u6b64\u88abGAP\u9501\u963b\u585e<\/p>\n<p>\u901a\u8fc7\u963b\u585e\u8bb0\u5f55\u4e5f\u53ef\u4ee5\u770b\u51faT2,T3\u5747\u88ab\u4e34\u952e\u9501\u963b\u585e<\/p>\n<p><img decoding=\"async\" width=\"723\" height=\"120\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdbt4A\" alt=\"image-20240121141206330.png\" title=\"image-20240121141206330.png\" loading=\"lazy\"><\/p>\n<p>\u81f3\u6b64\u7b49\u503c\u67e5\u8be2\u7684\u6848\u4f8b\u5206\u6790\u5b8c\u6bd5\uff0c\u5c0f\u7ed3\u5982\u4e0b\uff1a<\/p>\n<ul>\n<li><strong>\u7b49\u503c\u67e5\u8be2\u627e\u4e0d\u5230\u8bb0\u5f55\uff1a\u8be5\u533a\u95f4\u52a0GAP\u9501<\/strong><\/li>\n<li>\n<p><strong>\u7b49\u503c\u67e5\u8be2\u627e\u5230\u8bb0\u5f55<\/strong><\/p>\n<ol>\n<li><strong>\u552f\u4e00\u7d22\u5f15\uff1a\u4e34\u952e\u9501\u4f1a\u9000\u5316\u4e3a\u8bb0\u5f55\u9501<\/strong><\/li>\n<li><strong>\u975e\u552f\u4e00\u7d22\u5f15\uff1a\u4e00\u76f4\u626b\u63cf\u5230\u7b2c\u4e00\u6761\u4e0d\u6ee1\u8db3\u6761\u4ef6\u7684\u8bb0\u5f55\u5e76\u5c06\u4e34\u952e\u9501\u9000\u5316\u4e3a\u95f4\u9699\u9501<\/strong><\/li>\n<\/ol>\n<\/li>\n<\/ul>\n<h4>\u6848\u4f8b\uff1a\u8303\u56f4\u67e5\u8be2<\/h4>\n<p>\u5728\u4e0a\u9762\u7b49\u503c\u67e5\u8be2 + \u975e\u552f\u4e00\u7d22\u5f15\u7684\u573a\u666f\u4e0b\uff0c\u7531\u4e8e\u65e0\u6cd5\u5224\u65ad\u8be5\u503c\u6570\u91cf\uff0c\u56e0\u6b64\u4f1a\u4e00\u76f4\u626b\u63cf\uff0c\u53ef\u4ee5\u628a\u8fd9\u79cd\u573a\u666f\u7406\u89e3\u6210\u8303\u56f4\u67e5\u8be2<\/p>\n<table>\n<thead>\n<tr>\n<th align=\"center\"> <\/th>\n<th align=\"center\">T1<\/th>\n<th align=\"center\">T2<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td align=\"center\">1<\/td>\n<td align=\"center\">begin;&lt;br\/&gt;select * from s where id\/&gt;=10 and id&lt;=20 for update;<\/td>\n<td align=\"center\"> <\/td>\n<\/tr>\n<tr>\n<td align=\"center\">2<\/td>\n<td align=\"center\"> <\/td>\n<td align=\"center\">insert into s values (21,&#8217;caicaiJava&#8217;,21);&lt;br\/&gt;(\u963b\u585e)<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">3<\/td>\n<td align=\"center\">commit;<\/td>\n<td align=\"center\"> <\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u6309\u7167\u6b63\u5e38\u601d\u8def\u6765\u8bf4\uff0c\u6211\u7684\u67e5\u8be2\u6761\u4ef6\u572810-20\uff0c\u90a3\u4e48\u5c31\u4e0d\u80fd\u5f80\u8fd9\u4e2a\u8303\u56f4\u5916\u518d\u52a0\u9501\u4e86<\/p>\n<p>\u4f46\u662f\u65b0\u589e\u8be5\u8303\u56f4\u5916\u7684\u8bb0\u5f55\u662f\u4f1a\u963b\u585e\u7684\uff08\u6211\u660e\u660e\u67e5\u8be2\u6761\u4ef6\u572810\/~20\uff0c\u7ed3\u679c\u8d85\u8fc720\u4f60\u4e5f\u7ed9\u6211\u52a0\u9501\u662f\u5427\uff1f\uff09<\/p>\n<p><img decoding=\"async\" width=\"723\" height=\"81\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdbt4B\" alt=\"image-20240121112007123.png\" title=\"image-20240121112007123.png\" loading=\"lazy\"><\/p>\n<p>\u6211\u4eec\u6765\u5206\u6790\u4e0bT1\u52a0\u9501\u8fc7\u7a0b\uff1a <code>id&gt;=10 and id&lt;=20<\/code><\/p>\n<ol>\n<li>\u5b9a\u4f4d\u7b2c\u4e00\u6761\u8bb0\u5f55(id=10)\uff0c\u6309\u9053\u7406\u52a0\u95f4\u9699\u9501(\u524d\u5f00\u540e\u95ed)\u5e94\u8be5\u662f(1,10]\uff0c\u4f46\u662f\u6709\u7b49\u503c\u67e5\u8be2\u7684\u4f18\u5316\uff0c\u95f4\u9699\u9501\u9000\u5316\u4e3a\u8bb0\u5f55\u9501\uff0c\u56e0\u6b64\u53ea\u5bf910\u52a0\u9501 [10]<\/li>\n<li>\u7ee7\u7eed\u5411\u540e\u8303\u56f4\u626b\u63cf\uff0c\u5b9a\u4f4d\u5230\u8bb0\u5f55\uff08id=20\uff09\uff0c\u52a0\u9501\u8303\u56f4(10,20]<\/li>\n<li>\u6309\u7167\u6b63\u5e38\u601d\u8def\u4e3b\u952e\u662f\u552f\u4e00\u7684\uff0c\u6211\u5df2\u7ecf\u627e\u5230\u4e00\u676120\u4e86\uff0c\u90a3\u6211\u5e94\u8be5\u9000\u51fa\u624d\u5bf9\u5440\uff0c\u4f46\u662f\u5b83\u8fd8\u662f\u4f1a\u7ee7\u7eed\u626b\u63cf\uff0c\u76f4\u5230\u7b2c\u4e00\u6761\u4e0d\u6ee1\u8db3\u67e5\u8be2\u6761\u4ef6\u7684\u503c(id=25)\u5e76\u5c06\u4e34\u952e\u9501\u9501\u9000\u5316\u6210\u95f4\u9699\u9501\uff0c\u4e5f\u5c31\u662f\u4e0d\u572825\u52a0\u8bb0\u5f55\u9501\uff0c\u56e0\u6b64\u52a0\u9501\u8303\u56f4(20,25)<\/li>\n<\/ol>\n<p><img decoding=\"async\" width=\"723\" height=\"216\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdbt4C\" alt=\"image-20240121131856921.png\" title=\"image-20240121131856921.png\" loading=\"lazy\"><\/p>\n<p>\u6700\u7ec8\u52a0\u9501\u8303\u56f4 [10] + (10,20] + (20,25) = [10,25)\uff0c\u56e0\u6b64\u63d2\u5165\u4e3b\u952e\u4e3a21\u65f6\u4f1a\u88ab\u963b\u585e<\/p>\n<p>\u601d\u8003\uff1a\u6309\u7167\u6b63\u5e38\u7684\u601d\u8def\uff0c\u5f53\u5728\u975e\u552f\u4e00\u7d22\u5f15\u4e0a\u65f6\uff0c\u8fd9\u4e48\u626b\u63cf\u6ca1\u95ee\u9898\uff0c\u56e0\u4e3a\u4e0d\u77e5\u9053\u6ee1\u8db3\u7ed3\u679c\u768420\u6709\u591a\u5c11\u6761\uff0c\u53ea\u80fd\u5f80\u540e\u626b\u63cf\u627e\u5230\u7b2c\u4e00\u6761\u4e0d\u6ee1\u8db3\u6761\u4ef6\u7684\u8bb0\u5f55\uff1b\u800c\u5728\u552f\u4e00\u7d22\u5f15\u4e0a\u627e\u5230\u6700\u540e\u4e00\u4e2a\u6ee1\u8db3\u6761\u4ef6\u7684\u8bb0\u5f5520\u540e\uff0c\u8fd8\u7ee7\u7eed\u5f80\u540e\u52a0\u9501\u662f\u4e0d\u662f\u6709\u70b9\u5947\u602a\u5462\uff1f<\/p>\n<p>\u6211\u57288.0\u7684\u7248\u672c\u4e2d\u91cd\u73b0\u8fd9\u4e2a\u64cd\u4f5c\uff0c\u63d2\u5165id=21\u4e0d\u518d\u88ab\u963b\u585e\uff0c\u5e94\u8be5\u662f\u5728\u552f\u4e00\u7d22\u5f15\u4e0a\u626b\u63cf\u5230\u6700\u7ec8\u6ee1\u8db3\u6761\u4ef6\u7684\u8bb0\u5f55\uff08id=20\uff09\u5c31\u7ed3\u675f\uff0c\u52a0\u9501\u8303\u56f4\u5982\u4e0b\u56fe\uff08\u57285.7\u4e2d\u8fd9\u5e94\u8be5\u7b97bug\uff09<\/p>\n<p><img decoding=\"async\" width=\"723\" height=\"217\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdbt4D\" alt=\"image-20240121131946385.png\" title=\"image-20240121131946385.png\" loading=\"lazy\"><br \/><strong>\u8303\u56f4\u67e5\u8be2\u65f6\u65e0\u8bba\u662f\u5426\u552f\u4e00\u7d22\u5f15\u90fd\u4f1a\u626b\u63cf\u5230\u7b2c\u4e00\u6761\u4e0d\u6ee1\u8db3\u6761\u4ef6\u7684\u8bb0\u5f55\uff0c\u7136\u540e\u4e34\u952e\u9501\u9000\u5316\u4e3a\u95f4\u9699\u9501<\/strong> \uff088.0\u4fee\u590d\u552f\u4e00\u7d22\u5f15\u8303\u56f4\u67e5\u8be2\u65f6\u7684bug\uff09<\/p>\n<h4>\u6848\u4f8b\uff1a\u67e5\u627e\u8fc7\u7a0b\u4e2d\u600e\u4e48\u52a0\u9501<\/h4>\n<table>\n<thead>\n<tr>\n<th align=\"center\"> <\/th>\n<th align=\"center\">T1<\/th>\n<th align=\"center\">T2<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td align=\"center\">1<\/td>\n<td align=\"center\">begin;&lt;br\/&gt;update s set s\/_name = &#8216;caicai\u83dc\u83dc&#8217; where id = 20;<\/td>\n<td align=\"center\"> <\/td>\n<\/tr>\n<tr>\n<td align=\"center\">2<\/td>\n<td align=\"center\"> <\/td>\n<td align=\"center\">select s\/_name,id from s where s\/_name like &#8216;cai%&#8217; for update; &lt;br\/&gt;(\u963b\u585e)<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">3<\/td>\n<td align=\"center\">commit;<\/td>\n<td align=\"center\"> <\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>T1 \u4e8b\u52a1\u5728\u4fee\u6539\u65f6\u5148\u4f7f\u7528\u805a\u7c07\u7d22\u5f15\u5b9a\u4f4d\u5230id=20\u7684\u8bb0\u5f55\uff0c\u4fee\u6539\u540e\u901a\u8fc7\u4e3b\u952eid=20\u627e\u5230\u4e8c\u7ea7\u7d22\u5f15\u4e0a\u7684\u8bb0\u5f55\u8fdb\u884c\u4fee\u6539\uff0c\u56e0\u6b64\u805a\u7c07\u7d22\u5f15\u3001\u4e8c\u7ea7\u7d22\u5f15\u4e0a\u90fd\u4f1a\u83b7\u53d6\u9501<\/p>\n<p><img decoding=\"async\" width=\"723\" height=\"365\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdbt4E\" alt=\"image-20240121145339318.png\" title=\"image-20240121145339318.png\" loading=\"lazy\"><\/p>\n<p>T2 \u4e8b\u52a1\u9501\u5b9a\u8bfb\u4e8c\u7ea7\u7d22\u5f15\u65f6\uff0c\u7531\u4e8e\u67e5\u8be2\u6761\u4ef6\u6ee1\u8db3\u4e8c\u7ea7\u7d22\u5f15\u7684\u503c\uff0c\u56e0\u6b64\u4e0d\u9700\u8981\u56de\u8868\uff0c\u4f46\u7531\u4e8eT1\u4e8b\u52a1\u9501\u4f4f\u4e8c\u7ea7\u7d22\u5f15\u4e0a\u7684\u8bb0\u5f55\uff0c\u56e0\u6b64\u53d1\u751f\u963b\u585e<\/p>\n<p><img decoding=\"async\" width=\"723\" height=\"67\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdbt4s\" alt=\"image-20240119113504300.png\" title=\"image-20240119113504300.png\" loading=\"lazy\"><\/p>\n<p>\u5728\u8be5\u6848\u4f8b\u4e2d\u8bf4\u660e\uff1a<strong>\u52a0\u9501\u65f6\u4f7f\u7528\u4ec0\u4e48\u7d22\u5f15\u5c31\u8981\u5728\u90a3\u4e2a\u7d22\u5f15\u4e0a\u52a0\u9501\uff0c\u904d\u5386\u5230\u54ea\u4e9b\u8bb0\u5f55\u5c31\u8981\u5728\u54ea\u4e9b\u8bb0\u5f55\u4e0a\u52a0\u9501<\/strong><\/p>\n<p>delete\uff1a\u4e0e\u4e3b\u952e\u76f8\u5173\u7684\u4e8c\u7ea7\u7d22\u5f15\u80af\u5b9a\u4e5f\u8981\u5220\u9664\uff0c\u56e0\u6b64\u4e8c\u7ea7\u7d22\u5f15\u4e0a\u5bf9\u5e94\u4e3b\u952e\u503c\u7684\u8bb0\u5f55\u4e5f\u4f1a\u88ab\u52a0\u9501<\/p>\n<p>update\uff1a\u5982\u679c\u5728\u4e8c\u7ea7\u7d22\u5f15\u4e0a\u4fee\u6539\uff0c\u90a3\u4e48\u4e00\u5b9a\u56de\u53bb\u805a\u7c07\u7d22\u5f15\u4e0a\u4fee\u6539\uff0c\u56e0\u6b64\u805a\u7c07\u7d22\u5f15\u4e5f\u4f1a\u88ab\u52a0\u9501\uff1b\u5982\u679c\u5728\u805a\u7c07\u7d22\u5f15\u4e0a\u4fee\u6539\uff0c\u4e8c\u7ea7\u7d22\u5f15\u53ef\u80fd\u4f1a\u9700\u8981\u88ab\u52a0\u9501\uff08\u5982\u4e0a\u6848\u4f8b\uff0c\u5982\u679c\u4fee\u6539\u7684\u662fs\/_age\u90a3\u4e48\u4e8c\u7ea7\u7d22\u5f15\u5c31\u4e0d\u9700\u8981\u52a0\u9501\uff09<\/p>\n<p>select\uff1a\u4f7f\u7528\u4ec0\u4e48\u7d22\u5f15\u5c31\u5728\u4ec0\u4e48\u7d22\u5f15\u4e0a\u52a0\u9501\uff0c\u6bd4\u5982\u4f7f\u7528\u805a\u7c07\u7d22\u5f15\u5c31\u8981\u5728\u805a\u7c07\u7d22\u5f15\u4e0a\u52a0\u9501\uff0c\u4f7f\u7528\u4e8c\u7ea7\u7d22\u5f15\u5c31\u5728\u4e8c\u7ea7\u7d22\u5f15\u4e0a\u52a0\u9501\uff08\u5982\u679c\u8981\u56de\u8868\u4e5f\u8981\u5728\u805a\u7c07\u7d22\u5f15\u4e0a\u52a0\u9501\uff09<\/p>\n<h4>\u6848\u4f8b\uff1aRC\u3001RR\u4ec0\u4e48\u65f6\u5019\u91ca\u653e\u9501<\/h4>\n<p>RC\u53ca\u4ee5\u4e0b\uff0cRR\u53ca\u4ee5\u4e0a\u5728\u83b7\u53d6\u5b8c\u9501\u540e\uff0c\u91ca\u653e\u9501\u7684\u65f6\u673a\u4e5f\u4e0d\u540c<\/p>\n<blockquote><p>RR\u4e0b<\/p><\/blockquote>\n<table>\n<thead>\n<tr>\n<th> <\/th>\n<th align=\"center\">T1<\/th>\n<th align=\"center\">T2<\/th>\n<th align=\"center\">T3<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>1<\/td>\n<td align=\"center\">begin;&lt;br\/&gt;update s force index (name\/_idx) set s\/_age = 20 where s\/_name \/&gt; &#8216;c&#8217; and s\/_age \/&gt; 18;<\/td>\n<td align=\"center\"> <\/td>\n<td align=\"center\"> <\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td align=\"center\"> <\/td>\n<td align=\"center\">select * from s where id = 1 for update;&lt;br\/&gt;(\u963b\u585e)<\/td>\n<td align=\"center\">insert into s values (33,&#8217;zz&#8217;,33);&lt;br\/&gt;(\u963b\u585e)<\/td>\n<\/tr>\n<tr>\n<td>3<\/td>\n<td align=\"center\">commit;<\/td>\n<td align=\"center\"> <\/td>\n<td align=\"center\"> <\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>T3\u63d2\u5165\u7684\u8bb0\u5f55\u6ee1\u8db3 <code>s_name &gt; 'c' and s_age &gt; 18<\/code> \u7684\u8bb0\u5f55\u88ab\u963b\u585e\u60c5\u6709\u53ef\u539f<\/p>\n<p>\u90a3\u4e3a\u5565T2 id=1\u4e0d\u6ee1\u8db3 <code>s_name &gt; 'c' and s_age &gt; 18<\/code> \u4e5f\u88ab\u963b\u585e\u4e86\u5462\uff1f<\/p>\n<p>T1\u4e8b\u52a1\u662f\u4e00\u6761\u4fee\u6539\u8bed\u53e5\uff0c\u6211\u4f7f\u7528force index \u8ba9\u5b83\u5f3a\u5236\u4f7f\u7528name\/_idx\u7d22\u5f15\uff0c\u67e5\u8be2\u6761\u4ef6\u4e3a <code>s_name &gt; 'c' and s_age &gt; 18<\/code><\/p>\n<p>\u7531\u4e8ename\/_idx\u4e0a\u4e0d\u5b58\u5728s\/_age\uff0c\u9700\u8981\u5224\u65ads\/_age\u5c31\u8981\u53bb\u805a\u7c07\u7d22\u5f15\uff0c\u56e0\u6b64\u805a\u7c07\u7d22\u5f15\u4e0a\u4e5f\u4f1a\u88ab\u52a0\u9501<\/p>\n<p>T1\u5728name\/_idx\u4e0a\uff0c\u6839\u636e\u67e5\u8be2\u6761\u4ef6s\/_name &gt; &#8216;c&#8217;\u8fdb\u884c\u52a0\u9501<\/p>\n<ol>\n<li>\u5b9a\u4f4d\u7b2c\u4e00\u6761s\/_name\u5927\u4e8ec\u7684\u8bb0\u5f55\uff0c\u52a0\u9501(ai,caicai\u83dc\u83dc]<\/li>\n<li>\u6839\u636e\u4e3b\u952e\u503cid=20\u53bb\u805a\u7c07\u7d22\u5f15\u4e2d\u627e\u5230\u8be5\u8bb0\u5f55\uff0c\u52a0\u9501[20,20]<\/li>\n<li>\u67e5\u770b\u662f\u5426\u6ee1\u8db3s\/_age&gt;18\u7684\u6761\u4ef6\uff0c\u5982\u679c\u6ee1\u8db3\u5219\u8fdb\u884c\u4fee\u6539\uff08\u4e0d\u6ee1\u8db3\u4e0d\u4f1a\u91ca\u653e\u9501\uff09<\/li>\n<li>\u7ee7\u7eed\u5faa\u73af\uff0c\u56de\u5230name\/_idx\u4e0a\u5bfb\u627e\u4e0b\u4e00\u6761\u8bb0\u5f55\uff08\u76f4\u5230\u4e0d\u6ee1\u8db3\u67e5\u8be2\u6761\u4ef6\u7684\u8bb0\u5f55\u6216\u904d\u5386\u5b8c\u8bb0\u5f55\u5219\u9000\u51fa\uff09<\/li>\n<\/ol>\n<p>\u6839\u636e1-3\u7684\u6b65\u9aa4\uff0c\u4f1a\u5728\u7d22\u5f15\u4e0a\u8fd9\u6837\u52a0\u9501<\/p>\n<p><img decoding=\"async\" width=\"723\" height=\"280\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdbt4F\" alt=\"image-20240121154121934.png\" title=\"image-20240121154121934.png\" loading=\"lazy\"><br \/>\u6700\u7ec8\u52a0\u9501\u72b6\u6001\uff1a\uff08name\/_id\u4e2d\u7684+\u221e\u5219\u6307\u7684\u662fsupremum\uff09<\/p>\n<p><img decoding=\"async\" width=\"723\" height=\"367\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdbt4G\" alt=\"image-20240121154321797.png\" title=\"image-20240121154321797.png\" loading=\"lazy\"><\/p>\n<p>\u5176\u4e2d\u53ea\u6709id=20\u7684\u8bb0\u5f55\u6ee1\u8db3 <code>s_name &gt; 'c' and s_age &gt; 18<\/code>\uff0c\u5373\u4f7f\u8fd9\u4e9b\u8bb0\u5f55\u4e0d\u6ee1\u8db3\u6761\u4ef6\u4e5f\u4e0d\u4f1a\u91ca\u653e\u9501<\/p>\n<p>\u56e0\u6b64T2\u8981\u83b7\u53d6\u805a\u7c07\u7d22\u5f15id=1\u7684\u8bb0\u5f55\u65f6\u88ab\u963b\u585e\uff0c\u800cT3\u5219\u662f\u88absupremum\u963b\u585e<\/p>\n<p><img decoding=\"async\" width=\"723\" height=\"92\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdbt4H\" alt=\"image-20240121155044545.png\" title=\"image-20240121155044545.png\" loading=\"lazy\"><\/p>\n<p><strong>\u5728RR\u4e0b\u4f7f\u7528\u7684\u7d22\u5f15\u904d\u5386\u5230\u54ea\u5c31\u628a\u9501\u52a0\u5230\u54ea\uff0c\u5373\u4f7f\u4e0d\u6ee1\u8db3\u67e5\u8be2\u6761\u4ef6\u4e5f\u4e0d\u4f1a\u91ca\u653e\u9501\uff0c\u76f4\u5230\u4e8b\u52a1\u63d0\u4ea4\u624d\u91ca\u653e<\/strong><\/p>\n<blockquote><p>RC<\/p><\/blockquote>\n<p>\u8bbe\u7f6e\u9694\u79bb\u7ea7\u522b<\/p>\n<pre><code class=\"sql\">SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED;\nSELECT @@tx_isolation;<\/code><\/pre>\n<table>\n<thead>\n<tr>\n<th> <\/th>\n<th align=\"center\">T1<\/th>\n<th align=\"center\">T2<\/th>\n<th align=\"center\">T3<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>1<\/td>\n<td align=\"center\">begin;&lt;br\/&gt;update s force index (name\/_idx) set s\/_age = 20 where s\/_name \/&gt; &#8216;c&#8217; and s\/_age \/&gt; 18;<\/td>\n<td align=\"center\"> <\/td>\n<td align=\"center\"> <\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td align=\"center\"> <\/td>\n<td align=\"center\">select * from s where id = 1 for update;&lt;br\/&gt;(\u4e0d\u963b\u585e)<\/td>\n<td align=\"center\">select * from s where id = 20 for update;&lt;br\/&gt;(\u963b\u585e)<\/td>\n<\/tr>\n<tr>\n<td>3<\/td>\n<td align=\"center\">commit;<\/td>\n<td align=\"center\"> <\/td>\n<td align=\"center\"> <\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u904d\u5386\u6d41\u7a0b\u4e0eRR\u60c5\u51b5\u76f8\u4f3c\uff0c\u4e0d\u540c\u7684\u662fRC\u53ea\u52a0\u8bb0\u5f55\u9501\uff0c\u5e76\u4e14\u4e0d\u6ee1\u8db3\u6761\u4ef6\u7684\u8bb0\u5f55\u4f1a\u7acb\u5373\u91ca\u653e\u9501\uff0c\u56e0\u6b64T2\u4e0d\u88ab\u963b\u585e\uff0c\u6ee1\u8db3\u6761\u4ef6\u7684T3\u88ab\u963b\u585e<\/p>\n<p><img decoding=\"async\" width=\"723\" height=\"60\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdbt4I\" alt=\"image-20240121160159473.png\" title=\"image-20240121160159473.png\" loading=\"lazy\"><\/p>\n<p>\u52a0\u9501\u5982\u4e0b\u56fe<\/p>\n<p><img decoding=\"async\" width=\"723\" height=\"342\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdbt4J\" alt=\"image-20240121160353308.png\" title=\"image-20240121160353308.png\" loading=\"lazy\"><\/p>\n<p><strong>\u904d\u5386\u5230\u54ea\u6761\u8bb0\u5f55\u5c31\u5148\u52a0\u9501\uff0c\u4f46\u662fRC\u5bf9\u4e8e\u4e0d\u6ee1\u8db3\u67e5\u8be2\u6761\u4ef6\u7684\u8bb0\u5f55\u4f1a\u91ca\u653e\u9501<\/strong><\/p>\n<h3>\u6b7b\u9501\u6848\u4f8b\u5206\u6790<\/h3>\n<p>\u6b7b\u9501\u6848\u4f8b\u5206\u6790\u7684\u662finsert\u52a0\u7684\u9501\uff0c\u914d\u5408\u4e0a\u9762\u65b0\u589e\u52a0\u9501\u89c4\u5219\u67e5\u770b<\/p>\n<h4>\u6848\u4f8b\uff1a\u65b0\u589e\u6b7b\u9501<\/h4>\n<p>\u5148\u5c06name\/_idx\u6539\u4e3a\u552f\u4e00\u7d22\u5f15<\/p>\n<table>\n<thead>\n<tr>\n<th align=\"center\"> <\/th>\n<th align=\"center\">T1<\/th>\n<th align=\"center\">T2<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td align=\"center\">1<\/td>\n<td align=\"center\">begin;&lt;br\/&gt;insert into s values (5,&#8217;bilibili&#8217;,5);<\/td>\n<td align=\"center\"> <\/td>\n<\/tr>\n<tr>\n<td align=\"center\">2<\/td>\n<td align=\"center\"> <\/td>\n<td align=\"center\">insert into s values (7,&#8217;bilibili&#8217;,7); &lt;br\/&gt;(\u963b\u585e)<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">3<\/td>\n<td align=\"center\">insert into s values (6,&#8217;balibali&#8217;,6);<\/td>\n<td align=\"center\"> <\/td>\n<\/tr>\n<tr>\n<td align=\"center\">4<\/td>\n<td align=\"center\"> <\/td>\n<td align=\"center\">\u6b7b\u9501 \u56de\u6eda<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>T1\u63d2\u5165bilibili\uff0cT2\u4e5f\u63d2\u5165bilibili\uff0c\u6309\u7167\u9053\u7406\u5e94\u8be5\u62a5\u9519\u552f\u4e00\u952e\u91cd\u590d\u5440\uff0cT2\u600e\u4e48\u963b\u585e\u4e86\u5462\uff1f<\/p>\n<p>T1\u540e\u7eed\u518d\u63d2\u5165balibali\u7adf\u7136\u53d1\u751f\u6b7b\u9501\u4e86\uff01\u5565\u60c5\u51b5\u5440\uff1f\u540c\u5b66\u4eec\u53ef\u4ee5\u5148\u6839\u636e\u524d\u9762\u8bf4\u5230\u7684insert\u52a0\u9501\u89c4\u5219\uff0c\u5927\u80c6\u731c\u6d4b\u5594\/~<\/p>\n<blockquote><p>\u67e5\u770b\u6700\u8fd1\u7684\u6b7b\u9501\u65e5\u5fd7<\/p><\/blockquote>\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662finnodb lock\u8868\u4e2d\u9501\u76f8\u5173\u4fe1\u606f\u8bb0\u5f55\u53ea\u6709\u6b63\u5728\u53d1\u751f\u65f6\u624d\u5b58\u5728\uff0c\u50cf\u8fd9\u79cd\u53d1\u751f\u6b7b\u9501\uff0c\u56de\u6eda\u4e8b\u52a1\u540e\u662f\u770b\u4e0d\u5230\u7684\uff0c\u56e0\u6b64\u6211\u4eec\u6765\u770b\u770b\u6b7b\u9501\u65e5\u5fd7<\/p>\n<p>show engine innodb status \u67e5\u770binnodb\u72b6\u6001\uff0c\u5176\u4e2d\u6709\u4e00\u6bb5\u6700\u8fd1\u68c0\u6d4b\u5230\u7684\u6b7b\u9501 latest detected deadlock<\/p>\n<p>\u7ea2\u8272\u6846\u8868\u793a\u4e8b\u52a1\u548c\u6301\u6709\/\u7b49\u5f85\u7684\u9501<\/p>\n<p>\u7eff\u8272\u6846\u8868\u793a\u9501\u7684\u4fe1\u606f\uff08\u90fd\u662f\u540c\u4e00\u628aX\u9501\uff09<\/p>\n<p><img decoding=\"async\" width=\"723\" height=\"483\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdbt4K\" alt=\"image-20240122173149508.png\" title=\"image-20240122173149508.png\" loading=\"lazy\"><\/p>\n<p>\u5982\u679c\u65e5\u5fd7\u8fd8\u662f\u770b\u4e0d\u592a\u61c2\u7684\u8bdd\uff0c\u6765\u770b\u770b\u4e0b\u9762\u8fd9\u6bb5\u5206\u6790\u5427\uff08\u4e3b\u8981\u8bf4name\/_idx\u7d22\u5f15\u4e0a\u7684\u6d41\u7a0b\u54c8\uff09<\/p>\n<p>1\u3001T1\u63d2\u5165bilibili\uff08\u9690\u5f0f\u9501\uff09<\/p>\n<p>2\u3001T2\u63d2\u5165bilibili\u53d1\u751f\u51b2\u7a81\uff0cT2\u5e2eT1\u751f\u6210\u9501\u7ed3\u6784\uff08\u9690\u5f0f\u9501\u8f6c\u5316\u4e3a\u663e\u793a\u9501\uff0cT1\u83b7\u5f97X record\uff09\uff0cT2\u8981\u52a0S\u4e34\u952e\u9501\uff0c\u5148\u83b7\u53d6GAP\u9501\uff08\u6210\u529f\uff09\uff0c\u518d\u83b7\u53d6S\u9501\uff08\u88abT1\u7684X record\u963b\u585e\uff09<\/p>\n<p>T1\u4e8b\u52a1id\u4e3a42861\uff0cT2\u4e8b\u52a1id\u4e3a42867\uff1a\u6839\u636e\u9501\u4fe1\u606f\u53ef\u4ee5\u770b\u5230T2\u60f3\u52a0\u7684S\u9501\u88abT1\u7684X\u9501\u963b\u585e<\/p>\n<p><img decoding=\"async\" width=\"723\" height=\"65\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdbt4L\" alt=\"image-20240122170704586.png\" title=\"image-20240122170704586.png\" loading=\"lazy\"><\/p>\n<p>3\u3001T1\u63d2\u5165balibali\uff0c\u63d2\u5165\u610f\u5411\u9501\u88abT2\u7684GAP\u9501\u963b\u585e\uff08\u6b7b\u9501\u6210\u73af\uff1aT1\u7b49\u5f85T2\u7684GAP\uff0cT2\u7b49\u5f85T1\u7684X\uff09<\/p>\n<p>\u56fe\u4e2d\u84dd\u8272\u4e0eT1\u6709\u5173\uff0c\u9ed1\u8272\u4e0eT2\u6709\u5173<\/p>\n<p>T1\uff1a\u6301\u6709[bilibili\uff0cbilibili] X\u9501\uff0c\u8981\u63d2\u5165balabala\u88abT2\u7684\u95f4\u9699\u9501\uff08ai,bilibili\uff09\u963b\u585e<\/p>\n<p>T2\uff1a\u6301\u6709\u95f4\u9699\u9501\uff08ai,bilibili\uff09\uff0c\u8981\u63d2\u5165[bilibili\uff0cbilibili]S\u9501\u88abT1\u7684[bilibili\uff0cbilibili]X\u9501\u963b\u585e<\/p>\n<p><img decoding=\"async\" width=\"723\" height=\"250\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdbt4M\" alt=\"image-20240122215439636.png\" title=\"image-20240122215439636.png\" loading=\"lazy\"><\/p>\n<p>\u90a3\u4e48\u5982\u4f55\u89e3\u51b3\u6b7b\u9501\u5462\uff1f<\/p>\n<p>\u5148\u6765\u770b\u770b\u6b7b\u9501\u4ea7\u751f\u7684\u56db\u4e2a\u6761\u4ef6\uff1a<strong>\u4e92\u65a5\u3001\u5360\u6709\u8d44\u6e90\u4e0d\u653e\u3001\u5360\u6709\u8d44\u6e90\u7ee7\u7eed\u7533\u8bf7\u8d44\u6e90\u3001\u7b49\u5f85\u8d44\u6e90\u6210\u73af<\/strong><\/p>\n<p>MySQL\u901a\u8fc7\u56de\u6eda\u4e8b\u52a1\u7684\u65b9\u5f0f\u89e3\u51b3\u6b7b\u9501\uff0c\u4e5f\u5c31\u662f\u89e3\u51b3\u5360\u6709\u8d44\u6e90\u4e0d\u653e<\/p>\n<p>\u4f46MySQL\u6b7b\u9501\u68c0\u6d4b\u662f\u975e\u5e38\u8017\u8d39CPU\u7684\uff0c\u4e3a\u4e86\u907f\u514d\u6b7b\u9501\u68c0\u6d4b\uff0c\u6211\u4eec\u5e94\u8be5\u5728\u4e1a\u52a1\u5c42\u9762\u9632\u6b62\u6b7b\u9501\u4ea7\u751f<\/p>\n<p>\u9996\u5148\u4e92\u65a5\u3001\u5360\u6709\u8d44\u6e90\u4e0d\u653e\u4e24\u4e2a\u6761\u4ef6\u662f\u65e0\u6cd5\u7834\u574f\u7684\uff0c\u56e0\u4e3a\u52a0\u9501\u7531MySQL\u6765\u5b9e\u73b0<\/p>\n<p>\u800c\u7834\u574f\u5360\u6709\u8d44\u6e90\u7ee7\u7eed\u7533\u8bf7\u8d44\u6e90\u7684\u4ee3\u4ef7\u53ef\u80fd\u4f1a\u5f88\u5927\uff0c\u6bd4\u5982\uff1a\u8ba9\u4e1a\u52a1\u5c42\u52a0\u9501\u5904\u7406<\/p>\n<p>\u6027\u4ef7\u6bd4\u6700\u9ad8\u7684\u5e94\u8be5\u662f\u7834\u574f\u7b49\u5f85\u8d44\u6e90\u6210\u73af\uff0c<strong>\u5f53\u53d1\u751f\u6b7b\u9501\u65f6\uff0c\u901a\u8fc7\u5206\u6790\u65e5\u5fd7\u3001\u52a0\u9501\u89c4\u5219\uff0c\u8c03\u6574\u4e1a\u52a1\u4ee3\u7801\u83b7\u53d6\u8d44\u6e90\u7684\u987a\u5e8f\u907f\u514d\u53d1\u751f\u6b7b\u9501<\/strong><\/p>\n<h4>\u6848\u4f8b\uff1a\u76f8\u540c\u7684\u65b0\u589e\u53d1\u751f\u6b7b\u9501<\/h4>\n<table>\n<thead>\n<tr>\n<th> <\/th>\n<th align=\"center\">T1<\/th>\n<th align=\"center\">T2<\/th>\n<th align=\"center\">T3<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>1<\/td>\n<td align=\"center\">insert into s values (15,&#8217;bili&#8217;,15);<\/td>\n<td align=\"center\"> <\/td>\n<td align=\"center\"> <\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td align=\"center\"> <\/td>\n<td align=\"center\">insert into s values (15,&#8217;bili&#8217;,15);&lt;br\/&gt;(\u963b\u585e)<\/td>\n<td align=\"center\">insert into s values (15,&#8217;bili&#8217;,15);&lt;br\/&gt;(\u963b\u585e)<\/td>\n<\/tr>\n<tr>\n<td>3<\/td>\n<td align=\"center\">rollback\uff1b<\/td>\n<td align=\"center\"> <\/td>\n<td align=\"center\"> <\/td>\n<\/tr>\n<tr>\n<td>4<\/td>\n<td align=\"center\"> <\/td>\n<td align=\"center\"> <\/td>\n<td align=\"center\">\u6b7b\u9501<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>T1\u3001T2\u3001T3\u65b0\u589e\u76f8\u540c\u7684\u8bb0\u5f55<\/p>\n<p>T1\u65b0\u589e\u540e\uff0cT2\u3001T3 \u4f1a\u5e2eT1\u751f\u6210\u9501\u7ed3\u6784X\u9501\u4ece\u800c\u88ab\u963b\u585e<\/p>\n<p>\u5f53T1\u56de\u6eda\u65f6\uff0cT2\uff0cT3\u7adf\u7136\u53d1\u751f\u6b7b\u9501\uff1f<\/p>\n<blockquote><p>\u5206\u6790\u6d41\u7a0b<\/p><\/blockquote>\n<ol>\n<li>T1 \u63d2\u5165 \u52a0\u9690\u5f0f\u9501<\/li>\n<li>T2 \u63d2\u5165\u76f8\u540c\u552f\u4e00\u8bb0\u5f55\uff0c\u5e2eT1\u751f\u6210X\u9501\uff0c\u81ea\u5df1\u83b7\u53d6S next key\uff0c\u5148\u83b7\u53d6gap\uff08\u6210\u529f\uff09\uff0c\u518d\u83b7\u53d6S record\uff08\u6b64\u65f6\u88abT1\u7684X\u9501\u963b\u585e\uff09\uff1bT3 \u4e0e T2 \u76f8\u4f3c\uff0c\u83b7\u53d6\u5230gap \u518d\u83b7\u53d6S record \u65f6\u88abT1\u7684X\u963b\u585e<\/li>\n<li>T1 \u56de\u6eda\uff0cT2\u3001T3\u83b7\u53d6S record\u6210\u529f\uff0c\u6b64\u65f6\u5b83\u4eec\u90fd\u8fd8\u8981\u83b7\u53d6X record\uff08\u63d2\u5165\u610f\u5411\u9501\u8f6c\u5316\u4e3a\u663e\u793a\u9501X\uff09\u5bfc\u81f4\u6b7b\u9501\u6210\u73af\uff08T2\u8981\u52a0X\u9501\u88abT3\u7684GAP\u963b\u585e\uff0cT3\u8981\u52a0X\u9501\u88abT2\u7684GAP\u963b\u585e\uff09<\/li>\n<\/ol>\n<p>\u56fe\u4e2dT2\u3001T3\u90fd\u5bf9bili\u52a0S next key\u9501\uff08\u6a59\u8272\u8bb0\u5f55\u548c\u524d\u9762\u7684\u9ed1\u8272\u95f4\u9699\uff09\uff0c\u5f53\u5b83\u4eec\u90fd\u60f3\u52a0\u63d2\u5165\u610f\u5411X\u9501\uff08\u84dd\u8272\u8bb0\u5f55\uff09\uff0c\u540c\u65f6\u4e5f\u88ab\u5404\u81ea\u7684GAP\u9501\u963b\u585e<\/p>\n<p><img decoding=\"async\" width=\"723\" height=\"239\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdbt4N\" alt=\"image-20240122223007061.png\" title=\"image-20240122223007061.png\" loading=\"lazy\"><\/p>\n<blockquote><p>\u67e5\u770b\u6b7b\u9501\u65e5\u5fd7<\/p><\/blockquote>\n<p><img decoding=\"async\" width=\"723\" height=\"537\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdbt4O\" alt=\"image-20240122221910988.png\" title=\"image-20240122221910988.png\" loading=\"lazy\"><\/p>\n<h3>\u603b\u7ed3<\/h3>\n<p>\u672c\u7bc7\u6587\u7ae0\u901a\u8fc7\u5927\u91cf\u6848\u4f8b\u3001\u56fe\u4f8b\u5206\u6790\u4e0d\u540c\u60c5\u51b5\u4e0b\u7684\u884c\u9501\u52a0\u9501\u89c4\u5219<\/p>\n<p>update\u3001delete \u5148\u67e5\u518d\u6539\uff0c\u53ef\u4ee5\u770b\u6210\u9501\u5b9a\u8bfb\uff0cinsert\u5219\u662f\u6709\u5355\u72ec\u4e00\u5957\u52a0\u9501\u89c4\u5219<\/p>\n<blockquote><p>\u9501\u5b9a\u8bfb\u52a0\u9501\u89c4\u5219<\/p><\/blockquote>\n<p><strong>\u5728RC\u53ca\u4ee5\u4e0b\u9694\u79bb\u7ea7\u522b\uff0c\u9501\u5b9a\u8bfb\u4f7f\u7528record\u9501\uff1b\u5728RR\u53ca\u4ee5\u4e0a\u9694\u79bb\u7ea7\u522b\uff0c\u9501\u5b9a\u8bfb\u4f7f\u7528next key\u9501<\/strong><\/p>\n<p><strong>\u7b49\u503c\u67e5\u8be2\uff1a\u5982\u679c\u627e\u4e0d\u5230\u8bb0\u5f55\uff0c\u8be5\u67e5\u8be2\u6761\u4ef6\u6240\u5728\u533a\u95f4\u52a0GAP\u9501\uff1b\u5982\u679c\u627e\u5230\u8bb0\u5f55\uff0c\u552f\u4e00\u7d22\u5f15\u4e34\u952e\u9501\u9000\u5316\u4e3a\u8bb0\u5f55\u9501\uff0c\u975e\u552f\u4e00\u7d22\u5f15\u9700\u8981\u626b\u63cf\u5230\u7b2c\u4e00\u6761\u4e0d\u6ee1\u8db3\u6761\u4ef6\u7684\u8bb0\u5f55\uff0c\u6700\u540e\u4e34\u952e\u9501\u9000\u5316\u4e3a\u95f4\u9699\u9501\uff08\u4e0d\u5728\u6700\u540e\u4e00\u6761\u4e0d\u6ee1\u8db3\u6761\u4ef6\u7684\u8bb0\u5f55\u4e0a\u52a0\u8bb0\u5f55\u9501\uff09<\/strong><\/p>\n<p><strong>\u8303\u56f4\u67e5\u8be2\uff1a\u975e\u552f\u4e00\u7d22\u5f15\u9700\u8981\u626b\u63cf\u5230\u7b2c\u4e00\u6761\u4e0d\u6ee1\u8db3\u6761\u4ef6\u7684\u8bb0\u5f55<\/strong>\uff085.7\u4e2d\u552f\u4e00\u7d22\u5f15\u4e5f\u4f1a\u626b\u63cf\u7b2c\u4e00\u6761\u4e0d\u6ee1\u8db3\u6761\u4ef6\u7684\u8bb0\u5f558.0\u4fee\u590d\uff0c\u540e\u6587\u63cf\u8ff0\uff09<\/p>\n<p><strong>\u5728\u67e5\u627e\u7684\u8fc7\u7a0b\u4e2d\uff0c\u4f7f\u7528\u5230\u4ec0\u4e48\u7d22\u5f15\u5c31\u5728\u90a3\u4e2a\u7d22\u5f15\u4e0a\u52a0\u9501\uff0c\u904d\u5386\u5230\u54ea\u6761\u8bb0\u5f55\u5c31\u7ed9\u54ea\u6761\u5148\u52a0\u9501<\/strong><\/p>\n<p><strong>\u5728RC\u53ca\u4ee5\u4e0b\u9694\u79bb\u7ea7\u522b\u4e0b\uff0c\u67e5\u627e\u8fc7\u7a0b\u4e2d\u5982\u679c\u8bb0\u5f55\u4e0d\u6ee1\u8db3\u5f53\u524d\u67e5\u8be2\u6761\u4ef6\u5219\u4f1a\u91ca\u653e\u9501\uff1b\u5728RR\u53ca\u4ee5\u4e0a\u65e0\u8bba\u662f\u5426\u6ee1\u8db3\u67e5\u8be2\u6761\u4ef6\uff0c\u53ea\u8981\u904d\u5386\u8fc7\u8bb0\u5f55\u5c31\u4f1a\u52a0\u9501\uff0c\u76f4\u5230\u4e8b\u52a1\u63d0\u4ea4\u624d\u91ca\u653e<\/strong><\/p>\n<blockquote><p>insert\u52a0\u9501\u89c4\u5219<\/p><\/blockquote>\n<p><strong>\u6b63\u5e38\u60c5\u51b5\u4e0b\u52a0\u9501\uff1a<\/strong><\/p>\n<ol>\n<li><strong>\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u63d2\u5165\u4f7f\u7528\u9690\u5f0f\u9501\uff08\u63d2\u5165\u610f\u5411\u9501\uff09\uff0c\u4e0d\u751f\u6210\u9501\u7ed3\u6784<\/strong><\/li>\n<li><strong>\u5f53\u63d2\u5165\u610f\u5411\u9501\uff08\u9690\u5f0f\u9501\uff09\u88ab\u5176\u4ed6\u4e8b\u52a1\u751f\u6210\u9501\u7ed3\u6784\u65f6\u53d8\u4e3a\u663e\u793a\u9501\uff08X record\uff09<\/strong><\/li>\n<\/ol>\n<p><strong>\u91cd\u590d\u51b2\u7a81\u52a0\u9501\uff1a<\/strong><\/p>\n<ol>\n<li><strong>\u5f53insert\u9047\u5230\u91cd\u590d\u4e3b\u952e\u51b2\u7a81\u65f6\uff0cRC\u53ca\u4ee5\u4e0b\u52a0S record\uff0cRR\u53ca\u4ee5\u4e0a\u52a0S next key<\/strong><\/li>\n<li><strong>\u5f53insert\u9047\u5230\u91cd\u590d\u552f\u4e00\u4e8c\u7ea7\u7d22\u5f15\u65f6\uff0c\u52a0S next key<\/strong><\/li>\n<\/ol>\n<p><strong>\u5982\u679c\u4f7f\u7528<code>ON DUPLICATE KEY update<\/code>\u90a3\u4e48S\u9501\u4f1a\u6362\u6210X\u9501<\/strong><\/p>\n<p>\u5916\u952e\u52a0\u9501\uff1a\u4e00\u822c\u4e0d\u505a\u7269\u7406\u5916\u952e\uff0c\u7565&#8230;<\/p>\n<h3>\u6700\u540e\uff08\u4e0d\u8981\u767d\u5ad6\uff0c\u4e00\u952e\u4e09\u8fde\u6c42\u6c42\u62c9\/~\uff09<\/h3>\n<p>\u672c\u7bc7\u6587\u7ae0\u88ab\u6536\u5165\u4e13\u680f <a target=\"_blank\" href=\"https:\/\/link.segmentfault.com\/?enc=bz2GJG7UAIUmD955dOPyEQ%3D%3D.lTVRM%2BVR8EY%2BHQF%2FA8O7Zrke6vtrhNdOhArvRhnY6KciSdcIJRIel1V4Fn%2F522ZU\" rel=\"noopener noreferrer\">MySQL\u8fdb\u9636\u4e4b\u8def<\/a>\uff0c\u611f\u5174\u8da3\u7684\u540c\u5b66\u53ef\u4ee5\u6301\u7eed\u5173\u6ce8\u5594<\/p>\n<p>\u672c\u7bc7\u6587\u7ae0\u7b14\u8bb0\u4ee5\u53ca\u6848\u4f8b\u88ab\u6536\u5165 <a target=\"_blank\" href=\"https:\/\/link.segmentfault.com\/?enc=H%2F8xWxN1NS8DlZP7we%2BP%2FA%3D%3D.lUEmowTG0Yh6%2FCJI5iXF6%2FyEEWCDIC7lxUd8EB7xflU8ipPaP2%2BA83BQANRYjmQ%2FcE9FnqQwTxvrw%2FwWy6cMvFc1%2BScMecnBh%2FUciUp%2BoPICINm3s%2Fm47H%2BJFBrcXLRE\" rel=\"noopener noreferrer\">gitee-StudyJava<\/a>\u3001 <a target=\"_blank\" href=\"https:\/\/link.segmentfault.com\/?enc=jl8lk9DEJzwxIxhnqHPgpA%3D%3D.OcYpdNE7ZizPIr6FEvxluJfLsCoK0N5THzomhAsQTOz84yiFTlEl698ikQfERfWIe6QceFMlTdq%2FcVmqTboaa4Sg0qXTci99BbbglADBVOs%3D\" rel=\"noopener noreferrer\">github-StudyJava<\/a> \u611f\u5174\u8da3\u7684\u540c\u5b66\u53ef\u4ee5stat\u4e0b\u6301\u7eed\u5173\u6ce8\u5594\/~<\/p>\n<p>\u6709\u4ec0\u4e48\u95ee\u9898\u53ef\u4ee5\u5728\u8bc4\u8bba\u533a\u4ea4\u6d41\uff0c\u5982\u679c\u89c9\u5f97\u83dc\u83dc\u5199\u7684\u4e0d\u9519\uff0c\u53ef\u4ee5\u70b9\u8d5e\u3001\u5173\u6ce8\u3001\u6536\u85cf\u652f\u6301\u4e00\u4e0b\/~<\/p>\n<p>\u5173\u6ce8\u83dc\u83dc\uff0c\u5206\u4eab\u66f4\u591a\u5e72\u8d27\uff0c\u516c\u4f17\u53f7\uff1a\u83dc\u83dc\u7684\u540e\u7aef\u79c1\u623f\u83dc<\/p>\n<blockquote><p>\u672c\u6587\u7531\u535a\u5ba2\u4e00\u6587\u591a\u53d1\u5e73\u53f0 <a target=\"_blank\" href=\"https:\/\/link.segmentfault.com\/?enc=soqABk6l9lVtjjCxvCCQ0g%3D%3D.ouABU7uogKeQiI7WdvWvh9v8SPYJYyzuzbZoOoW4Dx2mAGq5rxn5rgB8udP8cTJn\" rel=\"noopener noreferrer\">OpenWrite<\/a> \u53d1\u5e03\uff01<\/p><\/blockquote>\n<p><a href=\"https:\/\/segmentfault.com\/a\/1190000044643885\">https:\/\/segmentfault.com\/a\/1190000044643885<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>10\u4e2a\u884c\u9501\u3001\u6b7b\u9501\u6848\u4f8b\u2b50\ufe0f24\u5f20\u52a0\u9501\u5206\u6790\u56fe\ud83d\ude80\u5f7b\u5e95\u641e\u61c2Innodb\u884c\u9501\u52a0\u9501\u89c4\u5219\uff01 \u4e0a\u7bc7\u6587\u7ae0 \u6211\u4eec\u63cf\u8ff0\u539f\u5b50\u6027\u4e0e\u9694\u79bb\u6027 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-10008390","post","type-post","status-publish","format-standard","hentry","category-share"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10008390","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10008390"}],"version-history":[{"count":0,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10008390\/revisions"}],"wp:attachment":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10008390"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10008390"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10008390"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}