{"id":10008413,"date":"2024-02-29T23:53:25","date_gmt":"2024-02-29T15:53:25","guid":{"rendered":"https:\/\/blog.itmax.cn\/?p=10008413"},"modified":"2024-02-29T23:53:25","modified_gmt":"2024-02-29T15:53:25","slug":"%e8%b7%b3%e6%a7%bd%e5%bf%85%e7%9c%8bmysql%e7%b4%a2%e5%bc%95%ef%bc%9ab%e6%a0%91%e5%8e%9f%e7%90%86%e6%8f%ad%e7%a7%98%e4%b8%8e%e7%b4%a2%e5%bc%95%e4%bc%98%e7%bc%ba%e7%82%b9%e5%88%86%e6%9e%90","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10008413","title":{"rendered":"\u8df3\u69fd\u5fc5\u770bMySQL\u7d22\u5f15\uff1aB+\u6811\u539f\u7406\u63ed\u79d8\u4e0e\u7d22\u5f15\u4f18\u7f3a\u70b9\u5206\u6790"},"content":{"rendered":"<blockquote><p>\u91d1\u4e09\u94f6\u56db\u8df3\u69fd\u5b63\uff0c\u4e0d\u77e5\u9053\u4f60\u51c6\u5907\u7684\u600e\u4e48\u6837\u4e86\uff1f<\/p><\/blockquote>\n<p>\u524d\u6bb5\u65f6\u95f4\u6211\u5206\u4eab\u4e86\u4e24\u7bc7\u6587\u7ae0\uff0c\u7c89\u4e1d\u80a1\u4e1c\u4eec\u7eb7\u7eb7\u8868\u793a<strong>\u6709\u7528\uff0c\u6709\u542f\u53d1\uff1a<\/strong>\uff0c\u4e4b\u524d\u6ca1\u770b\u7684\u8bdd\u53ef\u4ee5\u5148\u770b\u770b\uff1a<\/p>\n<p><a target=\"_blank\" href=\"https:\/\/link.segmentfault.com\/?enc=KGk82YAwBXJac1WVpn%2FTXg%3D%3D.%2BGAHzw73E1oQWkpDQWtrv0rGLCB8%2B%2FuO7OP9nTYiaqGFf9BUiFOTEXu9Da4sSbpF%2FYjyEpwHHsTVtIk5bT4iGcg9izBUZrEVZJDtLyyE4Sh2CNcmQYwRnfmjxjoUvC0VrB%2FtusIL4WgL3waa2N8EKaiV4i5G3gi%2F1li0PXZhQZXULMVQanvT8dx1YX2NS5yzHB3Es8Yd7zlbJnxaf7RNONQsvVojx4iY4kSvKeiNajj3H35W2A8S2Ka0JvgRs9D%2Bhd22LiIYsabLsxck4OTTRdlVZ%2ByaQMXCOlyFxJCNK18%3D\" rel=\"noopener noreferrer\">\u7a0b\u5e8f\u5458\u91d1\u4e09\u94f6\u56db\u8df3\u69fd\u6307\u5357\uff1a\u65f6\u95f4\u7ebf&#038;\u7ecf\u5178\u9762\u8bd516\u95ee<\/a><\/p>\n<p><a target=\"_blank\" href=\"https:\/\/link.segmentfault.com\/?enc=mQbOeM%2BqIjYZ%2F9Ts5Gs1yw%3D%3D.588IctZZPLHyYp5ZUBU6cLCY0ehbOAxUlazlqC%2BYHBMVQubc45PADpJM4Gl%2BOGMc9hh4jLrsIveXSq4XWAhBYI8EPt5IaWOmxqgFormUQz0PvOCAWgdqWaor9zxXaF0FYkrJPn3t8k%2Bt81a7IEHJgDLUEAFnVR1rdkMu4m9WYNhbPCrEvnRM4Zj2D5wM9ZYy%2BLExk%2FsiLosZfXbLcrIIN5DDhZYSTbx1nUcpNRHWYrj1Nd%2FYoyr6TOSd85khQcu5u4UUm5c8dbdXKI%2Ff2w%2B5xS6x1OfdRSQe%2F0nv6jnUFI4%3D\" rel=\"noopener noreferrer\">\u8fd9\u624d\u5f00\u5de5\u6ca1\u51e0\u5929\u5c31\u6536\u5230\u559c\u62a5\u4e86\uff0c\u7b80\u5386\u6539\u4e86\u662f\u771f\u6709\u7528\uff01<\/a><\/p>\n<p>\u4eca\u5929\u518d\u7ed9\u5927\u5bb6\u5206\u4eab\u4e00\u4e0b\u6570\u636e\u5e93\u7d22\u5f15\u7684\u8be6\u89e3\u6587\u7ae0\uff0c\u8fd9\u57fa\u672c\u662f\u5fc5\u8003\u7684\u77e5\u8bc6\u70b9\u3002<\/p>\n<h2>\u4e00\u3001\u7d22\u5f15\u4ecb\u7ecd<\/h2>\n<h3>1\u3001\u7d22\u5f15\u5b9a\u4e49<\/h3>\n<p>\u7d22\u5f15\u662f\u5b58\u50a8\u5f15\u64ce\u4e2d\uff0c<strong>\u7528\u4e8e\u5feb\u901f\u627e\u5230\u8bb0\u5f55\u7684\u4e00\u79cd\u6570\u636e\u7ed3\u6784<\/strong>\u3002\u7d22\u5f15\u80fd\u591f\u5e2e\u52a9\u5b58\u50a8\u5f15\u64ce\u5feb\u901f\u83b7\u53d6\u6570\u636e\uff0c\u5f62\u8c61\u7684\u8bf4\u5c31\u662f\u7d22\u5f15\u662f\u6570\u636e\u7684\u76ee\u5f55\u3002<\/p>\n<p>\u6240\u8c13\u7684<strong>\u5b58\u50a8\u5f15\u64ce<\/strong>\uff0c\u901a\u4fd7\u7684\u6765\u8bf4\u5c31\u662f\u5982\u4f55\u5b58\u50a8\u6570\u636e\u3001\u5982\u4f55\u4e3a\u5b58\u50a8\u7684\u6570\u636e\u5efa\u7acb\u7d22\u5f15\u548c\u5982\u4f55\u66f4\u65b0\u3001\u67e5\u8be2\u6570\u636e\u7b49 \u6280\u672f\u7684\u5b9e\u73b0\u65b9\u6cd5\u3002<\/p>\n<p><code>MySQL<\/code>\u5b58\u50a8\u5f15\u64ce\u6709<code>MyISAM<\/code>\u3001<code>InnoDB<\/code>\u3001<code>Memory<\/code>\uff0c\u5176\u4e2d<code>InnoDB<\/code>\u662f\u5728<code>MySQL 5.5<\/code>\u4e4b\u540e\u6210\u4e3a\u9ed8\u8ba4\u7684\u5b58 \u50a8\u5f15\u64ce\u3002<\/p>\n<p>\u5728\u5b9e\u9645\u573a\u666f\u4e2d\uff0c\u7d22\u5f15\u5bf9\u4e8e\u826f\u597d\u7684\u6027\u80fd\u8d77\u5230\u975e\u5e38\u5173\u952e\u7684\u4f5c\u7528\u3002\u6216\u8bb8\u5728\u6570\u636e\u91cf\u5c0f\u4e14\u8d1f\u8f7d\u8f83\u4f4e\u65f6\uff0c\u7d22\u5f15\u7684\u4e0d\u6070\u5f53\u4f7f\u7528\u53ef\u80fd\u5bf9\u6027\u80fd\u7684\u5f71\u54cd\u53ef\u80fd\u4e0d\u4f1a\u592a\u660e\u663e\uff0c\u4f46\u662f\u5f53\u8868\u4e2d\u7684\u6570\u636e\u91cf\u8d8a\u6765\u8d8a\u5927\u7684\u65f6\u5019\uff0c\u7d22\u5f15\u5bf9\u6027\u80fd\u7684\u5f71\u54cd\u5c31\u6108\u53d1\u91cd\u8981\uff0c\u4e0d\u6070\u5f53\u7684\u7d22\u5f15\u4f1a\u8ba9\u6027\u80fd\u6025\u5267\u7684\u4e0b\u964d\u3002<\/p>\n<h3>2\u3001\u7d22\u5f15\u7684\u67e5\u627e\u65b9\u5f0f<\/h3>\n<p>\u5728<code>MySQL<\/code>\u7684<code>InnoDB<\/code>\u5b58\u50a8\u5f15\u64ce\u4e2d<\/p>\n<h4><strong>\u82e5\u6ca1\u6709\u7d22\u5f15\u7684\u60c5\u51b5\u4e0b\u8fdb\u884c\u6570\u636e\u67e5\u8be2<\/strong><\/h4>\n<p><strong>a) \u5728\u4e00\u4e2a\u6570\u636e\u9875\u4e2d\u67e5\u8be2<\/strong><\/p>\n<p>\u5f53\u8868\u4e2d\u7684\u8bb0\u5f55\u6bd4\u8f83\u5c11\u65f6\uff0c\u6240\u6709\u8bb0\u5f55\u53ef\u4ee5\u5b58\u653e\u5230\u4e00\u4e2a\u6570\u636e\u9875\u4e2d\u3002\u5f53\u67e5\u8be2\u8bb0\u5f55\u65f6\uff0c\u6839\u636e\u641c\u7d22\u6761\u4ef6\u7684\u4e0d\u540c\u67e5\u8be2\u5206\u4e3a\u4e24\u79cd\u60c5\u51b5\uff1a<\/p>\n<ul>\n<li>\u4ee5<code>\u4e3b\u952e<\/code>\u4e3a\u641c\u7d22\u6761\u4ef6\uff1a\u5728\u4e00\u4e2a\u6570\u636e\u9875\u5185\u7684\u8bb0\u5f55\u4f1a\u6839\u636e\u4e3b\u952e\u503c\u7684\u5927\u5c0f\u4ece\u5c0f\u5230\u5927\u7684\u987a\u5e8f\u7ec4\u6210\u4e00\u4e2a\u5355\u5411\u94fe\u8868\u3002\u6bcf\u4e2a\u6570\u636e\u9875\u90fd\u4f1a\u4e3a\u5b58\u50a8\u5728\u5b83\u91cc\u9762\u7684\u8bb0\u5f55\u751f\u6210\u4e00\u4e2a\u9875\u76ee\u5f55\u3002\u901a\u8fc7\u4e3b\u952e\u67e5\u8be2\u67d0\u6761\u8bb0\u5f55\u53ef\u4ee5<strong>\u5728\u9875\u76ee\u5f55\u4e2d\u4f7f\u7528\u4e8c\u5206\u6cd5\u5feb\u901f\u5b9a\u4f4d\u5230\u5bf9\u5e94\u7684\u69fd<\/strong>\uff0c\u7136\u540e\u518d\u904d\u5386\u8be5\u69fd\u5bf9\u5e94\u5206\u7ec4\u7684\u8bb0\u5f55\uff0c\u5373\u53ef\u5feb\u901f\u627e\u5230\u6307\u5b9a\u7684\u8bb0\u5f55\u3002<\/li>\n<li>\u4ee5<code>\u5176\u4ed6\u5217<\/code>\u4f5c\u4e3a\u641c\u7d22\u6761\u4ef6\uff1a\u5bf9\u4e8e\u975e\u4e3b\u952e\u5217\u7684\u67e5\u627e\uff0c\u7531\u4e8e\u6ca1\u6709\u4e3a\u975e\u4e3b\u952e\u5217\u5efa\u7acb\u5bf9\u5e94\u7684\u76ee\u5f55\u9875\uff0c\u5373<strong>\u672a\u521b\u5efa\u7d22\u5f15<\/strong>\u3002\u65e0\u6cd5\u7528\u4e8c\u5206\u6cd5\u5feb\u901f\u5b9a\u4f4d\u76f8\u5e94\u7684\u69fd\uff0c\u53ea\u80fd\u4ece<code>Infimum<\/code>\u8bb0\u5f55\u5f00\u59cb\u4f9d\u6b21\u904d\u5386\u5355\u5411\u94fe\u8868\u4e2d\u7684\u6bcf\u6761\u8bb0\u5f55\uff0c\u7136\u540e\u5bf9\u6bd4\u6bcf\u6761\u8bb0\u5f55\u662f\u5426\u7b26\u5408\u641c\u7d22\u6761\u4ef6\uff0c\u5373\u5168\u8868\u626b\u63cf\uff0c\u56e0\u6b64\u6548\u7387\u975e\u5e38\u4f4e\u3002<\/li>\n<\/ul>\n<p><strong>b) \u5728\u591a\u4e2a\u6570\u636e\u9875\u4e2d\u67e5\u8be2<\/strong><\/p>\n<p>\u5728\u5f88\u591a\u60c5\u51b5\u4e0b\uff0c\u8868\u4e2d\u5b58\u653e\u7684\u8bb0\u5f55\u662f\u975e\u5e38\u591a\u7684\uff0c\u9700\u8981\u67e5\u8be2\u5230\u7684\u6570\u636e\u53ef\u80fd\u5206\u5e03\u5728\u591a\u4e2a\u6570\u636e\u9875\u4e2d\uff0c\u5728\u591a\u4e2a\u9875\u4e2d\u67e5\u627e\u8bb0\u5f55\u53ef\u4ee5\u5206\u4e3a\u4e24\u4e2a\u6b65\u9aa4\uff1a<\/p>\n<ul>\n<li><strong>\u5b9a\u4f4d\u5230\u8bb0\u5f55\u6240\u5728\u7684\u9875<\/strong><\/li>\n<li><strong>\u4ece\u6240\u5728\u7684\u9875\u5185\u67e5\u627e\u76f8\u5e94\u7684\u8bb0\u5f55<\/strong><\/li>\n<\/ul>\n<p>\u5728\u6ca1\u6709\u7d22\u5f15\u7684\u60c5\u51b5\u4e0b\uff0c\u65e0\u8bba\u662f\u6839\u636e\u4e3b\u952e\u5217\u8fd8\u662f\u5176\u4ed6\u5217\u7684\u503c\u67e5\u627e\uff0c\u90fd\u4e0d\u80fd\u5feb\u901f\u5b9a\u4f4d\u5230\u8bb0\u5f55\u6240\u5728\u7684\u9875\uff0c\u56e0\u6b64\u53ea\u80fd\u4ece\u7b2c\u4e00\u9875\u6cbf\u7740\u53cc\u5411\u94fe\u8868\u4e00\u76f4\u5f80\u4e0b\u627e\uff0c\u56e0\u800c\u975e\u5e38\u8017\u65f6\u3002<\/p>\n<h4><strong>\u82e5\u5b58\u5728\u7d22\u5f15\u7684\u60c5\u51b5\u4e0b\u8fdb\u884c\u6570\u636e\u67e5\u8be2<\/strong><\/h4>\n<p>\u5728\u521b\u5efa\u7d22\u5f15\u7684\u60c5\u51b5\u4e0b\uff0c\u6bcf\u4e2a\u6570\u636e\u9875\u90fd\u4f1a\u4e3a\u5b58\u50a8\u5728\u5b83\u91cc\u9762\u7684\u8bb0\u5f55\u751f\u6210\u4e00\u4e2a\u76ee\u5f55\u9879\uff0c\u5728\u901a\u8fc7\u7d22\u5f15\u67e5\u627e\u67d0\u6761\u8bb0\u5f55\u65f6\u53ef\u4ee5\u5728\u9875\u76ee\u5f55\u4e2d\u4f7f\u7528\u4e8c\u5206\u6cd5\u5feb\u901f\u5b9a\u4f4d\u5230\u5bf9\u5e94\u7684\u69fd\uff0c\u7136\u540e\u518d\u904d\u5386\u8be5\u69fd\u5bf9\u5e94\u5206\u7ec4\u4e2d\u7684\u8bb0\u5f55\uff0c\u5feb\u901f\u627e\u5230\u6307\u5b9a\u7684\u8bb0\u5f55\uff0c\u786e\u5b9a\u8bb0\u5f55\u540e\uff0c\u5373\u53ef\u5411\u4e0b\u5bfb\u627e\u5f53\u524d\u8bb0\u5f55\u5bf9\u5e94\u7684\u4e0b\u4e00\u4e2a\u9875\u8282\u70b9\uff0c\u76f4\u5230\u5bfb\u627e\u5230\u5b58\u5728\u76ee\u6807\u8bb0\u5f55\u7684\u53f6\u5b50\u7ed3\u70b9\u3002<\/p>\n<h2>\u4e8c\u3001\u7d22\u5f15\u5206\u7c7b<\/h2>\n<h3>1\u3001\u6309\u6570\u636e\u7ed3\u6784\u5206\u7c7b<\/h3>\n<h4><strong>Hash\u7d22\u5f15<\/strong><\/h4>\n<p>\u54c8\u5e0c\u8868\u662f\u4e00\u79cd\u4ee5<code>\u952e-\u503c\uff08key-value\uff09<\/code>\u5b58\u50a8\u6570\u636e\u7684\u7ed3\u6784\uff0c\u8f93\u5165\u5f85\u67e5\u627e\u7684\u952e\uff0c\u5373<code>key<\/code>\uff0c\u5c31\u53ef\u4ee5\u627e\u5230\u5176\u5bf9\u5e94\u7684\u503c\uff0c\u5373<code>value<\/code>\u3002<\/p>\n<p>\u54c8\u5e0c\u7684\u601d\u8def\u5f88\u7b80\u5355\uff0c\u628a\u503c\u653e\u5728\u6570\u7ec4\u91cc\uff0c\u7528\u4e00\u4e2a\u54c8\u5e0c\u51fd\u6570\u628a<code>key<\/code>\u6362\u7b97\u6210\u4e00\u4e2a\u786e\u5b9a\u7684\u4f4d\u7f6e\uff0c\u7136\u540e\u628a<code>value<\/code>\u653e\u5728\u6570\u7ec4\u7684\u8fd9\u4e2a\u4f4d\u7f6e\u3002<\/p>\n<p>\u4e0d\u53ef\u907f\u514d\u5730\uff0c\u591a\u4e2a<code>key<\/code>\u503c\u7ecf\u8fc7\u54c8\u5e0c\u51fd\u6570\u7684\u6362\u7b97\uff0c\u4f1a\u51fa\u73b0\u540c\u4e00\u4e2a\u503c\u7684\u60c5\u51b5\uff0c\u5373\u54c8\u5e0c\u78b0\u649e\uff0c\u5904\u7406\u8fd9\u79cd\u60c5\u51b5\u7684\u4e00\u79cd\u65b9\u6cd5\u662f\uff0c\u62c9\u51fa\u4e00\u4e2a\u94fe\u8868\u3002<\/p>\n<p>\u4f46\u662f\uff0c<strong>\u5728\u54c8\u5e0c\u8868\u4e2d\uff0c\u6570\u636e\u7684\u5b58\u50a8\u4e0d\u662f\u6309\u987a\u5e8f\u5b58\u653e\u7684<\/strong>\uff0c\u6240\u4ee5\u54c8\u5e0c\u7d22\u5f15\u505a\u533a\u95f4\u67e5\u8be2\u7684\u901f\u5ea6\u662f\u5f88\u6162\u7684\u3002<\/p>\n<p>\u6240\u4ee5\uff0c\u54c8\u5e0c\u8868\u8fd9\u79cd\u7ed3\u6784<strong>\u9002\u7528\u4e8e\u53ea\u6709\u7b49\u503c\u67e5\u8be2\u7684\u573a\u666f<\/strong>\uff0c\u6bd4\u5982<code>Memcached<\/code>\u53ca\u5176\u4ed6\u4e00\u4e9b<code>NoSQL<\/code>\u5f15\u64ce\u3002<\/p>\n<h4><strong>\u6709\u5e8f\u6570\u7ec4<\/strong><\/h4>\n<p>\u6709\u5e8f\u6570\u7ec4\u5728<strong>\u7b49\u503c\u67e5\u8be2\u548c\u8303\u56f4\u67e5\u8be2<\/strong>\u573a\u666f\u4e2d\u7684\u6027\u80fd\u5c31\u90fd\u975e\u5e38\u4f18\u79c0\u3002<\/p>\n<p>\u5728\u67e5\u627e\u6570\u636e\u65b9\u9762\uff0c\u6709\u5e8f\u6570\u7ec4\u53ef\u4ee5<strong>\u901a\u8fc7\u4e8c\u5206\u67e5\u627e\u7684\u65b9\u5f0f<\/strong>\u5feb\u901f\u627e\u5230\uff0c\u65f6\u95f4\u590d\u6742\u5ea6\u662f <code>O(log(N))<\/code>\u3002<\/p>\n<p>\u540c\u6837\uff0c\u6709\u5e8f\u6570\u7ec4\u7684\u7d22\u5f15\u7ed3\u6784<strong>\u652f\u6301\u8303\u56f4\u67e5\u8be2<\/strong>\uff0c\u901a\u8fc7<strong>\u4e8c\u5206\u6cd5<\/strong>\u627e\u5230\u9700\u8981\u67e5\u627e\u7684\u8303\u56f4\u7684\u9996\u5143\u7d20\uff0c\u7136\u540e\u5411\u540e\u904d\u5386\uff0c\u76f4\u5230\u627e\u5230\u7b2c\u4e00\u4e2a\u4e0d\u6ee1\u8db3\u6761\u4ef6\u7684\u5143\u7d20\u4e3a\u6b62\u3002<\/p>\n<p>\u5982\u679c\u4ec5\u4ec5\u770b\u67e5\u8be2\u6548\u7387\uff0c\u6709\u5e8f\u6570\u7ec4\u5c31\u662f\u6700\u597d\u7684\u6570\u636e\u7ed3\u6784\u4e86\u3002\u4f46\u662f\uff0c\u5728\u9700\u8981\u66f4\u65b0\u6570\u636e\u7684\u65f6\u5019\u5c31\u9ebb\u70e6\u4e86\uff0c\u5f80\u4e2d\u95f4\u63d2\u5165\u4e00\u4e2a\u8bb0\u5f55\u5c31\u5fc5\u987b\u5f97\u632a\u52a8\u540e\u9762\u6240\u6709\u7684\u8bb0\u5f55\uff0c\u6210\u672c\u592a\u9ad8\u3002<\/p>\n<p>\u6240\u4ee5\uff0c<strong>\u6709\u5e8f\u6570\u7ec4\u7d22\u5f15\u4e00\u822c\u9002\u7528\u4e8e\u9759\u6001\u5b58\u50a8\u5f15\u64ce<\/strong>\u3002<\/p>\n<h4><strong>B+\u6811\uff08InnoDB\u7d22\u5f15\u7ed3\u6784\uff09<\/strong><\/h4>\n<p>\u5728<code>MySQL 5.5<\/code>\u4e4b\u540e\uff0c<code>InnoDB<\/code>\u6210\u4e3a\u9ed8\u8ba4\u7684<code>MySQL<\/code>\u5b58\u50a8\u5f15\u64ce\uff0c<code>B+Tree<\/code>\u7d22\u5f15\u7c7b\u578b\u4e5f\u662f<code>MySQL<\/code>\u5b58\u50a8\u5f15\u64ce\u91c7\u7528\u6700\u591a\u7684\u7d22\u5f15\u7c7b\u578b\u3002<\/p>\n<p>\u5728<code>InnoDB<\/code>\u6570\u636e\u9875\u4e2d\uff0c\u5404\u4e2a\u6570\u636e\u9875\u53ef\u4ee5\u7ec4\u6210\u4e00\u4e2a<strong>\u53cc\u5411\u94fe\u8868<\/strong>\uff0c\u800c\u6bcf\u4e2a\u6570\u636e\u9875\u4e2d\u7684\u8bb0\u5f55\u4f1a\u6309\u7167\u4e3b\u952e\u503c\u4ece\u5c0f\u5230\u5927\u7684\u987a\u5e8f\u7ec4\u6210\u4e00\u4e2a\u5355\u5411\u94fe\u8868\u3002<\/p>\n<p>\u5728\u4ecb\u7ecd<code>B+\u6811<\/code>\u65f6\uff0c\u6211\u4eec\u4ee5\u4e3b\u952e\u7d22\u5f15\u4e3a\u4f8b\uff0c\u6765\u770b\u770b<code>InnoDB<\/code>\u662f\u5982\u4f55\u6784\u5efa\u4e3b\u952e\u7d22\u5f15\u7684<code>B+\u6811<\/code>\u3002\u5176\u4ed6\u5b57\u6bb5\u6240\u5efa\u7acb\u7684\u7d22\u5f15\u4e0e\u4e3b\u952e\u7d22\u5f15\u76f8\u4f3c\uff0c\u53ea\u662f\u5c06\u4e3b\u952e\u5b57\u6bb5\u66ff\u6362\u6210\u6307\u5b9a\u7684\u7d22\u5f15\u5b57\u6bb5\u6765\u6784\u5efa<code>B+\u6811<\/code>\u3002<\/p>\n<h5>\u4e3b\u952e\u7b56\u7565<\/h5>\n<p>\u5728\u521b\u5efa\u8868\u65f6\uff0c<code>InnoDB<\/code>\u5b58\u50a8\u5f15\u64ce\u4f1a\u6839\u636e\u4e0d\u540c\u7684\u573a\u666f\u9009\u62e9\u4e0d\u540c\u7684\u5217\u4f5c\u4e3a\u4e3b\u952e\u7d22\u5f15\uff1a<\/p>\n<ul>\n<li>\u5982\u679c\u6709\u6307\u5b9a\u4e3b\u952e\uff0c\u9ed8\u8ba4\u4f1a\u4f7f\u7528\u4e3b\u952e\u4f5c\u4e3a\u805a\u7c07\u7d22\u5f15\u7684\u7d22\u5f15\u952e<\/li>\n<li>\u5982\u679c\u6ca1\u6709\u6307\u5b9a\u4e3b\u952e\uff0c\u5219\u9009\u62e9\u7b2c\u4e00\u4e2a\u4e0d\u5305\u542b<code>NULL<\/code>\u503c\u7684\u552f\u4e00\u5217\u4f5c\u4e3a\u805a\u7c07\u7d22\u5f15\u7684\u7d22\u5f15\u952e<\/li>\n<li>\u5728\u4e0a\u9762\u4e24\u4e2a\u90fd\u6ca1\u6709\u7684\u60c5\u51b5\u4e0b\uff0c<code>InnoDB<\/code>\u5c06\u81ea\u52a8\u751f\u6210\u4e00\u4e2a<code>\u9690\u5f0f\u81ea\u589eid<\/code>\u5217\u4f5c\u4e3a\u805a\u7c07\u7d22\u5f15\u7684\u7d22\u5f15\u952e<\/li>\n<\/ul>\n<p>\u9664\u4e3b\u952e\u7d22\u5f15\u5916\uff0c\u5176\u5b83\u7d22\u5f15\u90fd\u5c5e\u4e8e<code>\u8f85\u52a9\u7d22\u5f15\uff08Secondary Index\uff09<\/code>\uff0c\u4e5f\u88ab\u79f0\u4e3a<strong>\u4e8c\u7ea7\u7d22\u5f15<\/strong>\u6216<strong>\u975e\u805a\u7c07\u7d22\u5f15<\/strong>\u3002\u521b\u5efa\u7684\u4e3b\u952e\u7d22\u5f15\u548c\u4e8c\u7ea7\u7d22\u5f15\u9ed8\u8ba4\u4f7f\u7528\u7684\u662f<code>B+Tree<\/code>\u7d22\u5f15\u3002<\/p>\n<h5>\u5efa\u7acbB+\u6811\u7d22\u5f15\u7684\u6761\u4ef6<\/h5>\n<p><strong>\u6761\u4ef6\u4e00\uff1a\u4e0b\u4e00\u4e2a\u6570\u636e\u9875\u4e2d\u8bb0\u5f55\u7684\u4e3b\u952e\u503c\u5fc5\u987b\u5927\u4e8e\u4e0a\u4e00\u4e2a\u6570\u636e\u9875\u4e2d\u8bb0\u5f55\u7684\u4e3b\u952e\u503c<\/strong><\/p>\n<p>\u6211\u4eec\u77e5\u9053\uff0c\u5728<code>MySQL<\/code>\u4e2d\uff0c\u65b0\u5206\u914d\u7684\u6570\u636e\u9875\u7f16\u53f7\u53ef\u80fd\u5e76\u4e0d\u662f\u8fde\u7eed\u7684\uff0c\u5373\u8fd9\u4e9b\u6570\u636e\u9875\u5728\u78c1\u76d8\u4e0a\u5e76\u975e\u7d27\u6328\u7740\u5b58\u50a8\u3002\u9700\u8981\u901a\u8fc7\u7ef4\u62a4\u4e0a\u4e00\u4e0b\u548c\u4e0b\u4e00\u9875\u7684\u7f16\u53f7\uff0c\u56e0\u6b64\uff0c<strong>\u5728<code>InnoDB<\/code>\u4e2d\uff0c\u6bcf\u4e2a\u6570\u636e\u9875\u7ec4\u6210\u4e86\u4e00\u4e2a\u53cc\u5411\u94fe\u8868<\/strong>\u6765\u7ef4\u62a4\u6bcf\u4e2a\u6570\u636e\u9875\u4e4b\u95f4\u7684\u4e0a\u4e0b\u5173\u7cfb\u3002<\/p>\n<p><strong>\u4e3a\u4ec0\u4e48\u6784\u5efaB+\u6811\u9700\u8981\u6ee1\u8db3\u6761\u4ef6\u4e00\u5462\uff1f<\/strong><\/p>\n<p>\u539f\u56e0\u5728\u4e8e\u4e3a\u4e86<strong>\u63d0\u9ad8\u8303\u56f4\u67e5\u8be2\u7684\u6548\u7387<\/strong>\uff0c<code>B+\u6811<\/code>\u8981\u6c42<strong>\u53f6\u5b50\u8282\u70b9\u4e2d\u7684\u6570\u636e\u8bb0\u5f55\u6309\u7167\u4e3b\u952e\u503c\u7684\u987a\u5e8f\u8fdb\u884c\u6392\u5217<\/strong>\u3002<\/p>\n<p>\u5f53\u8fdb\u884c\u8303\u56f4\u67e5\u8be2\u65f6\uff0c\u5982\u679c\u53f6\u5b50\u8282\u70b9\u4e2d\u7684\u6570\u636e\u8bb0\u5f55\u4e0d\u6309\u7167\u4e3b\u952e\u503c\u7684\u987a\u5e8f\u6392\u5217\uff0c\u5c31\u4f1a\u589e\u52a0\u67e5\u627e\u7684\u590d\u6742\u5ea6\u3002\u5982\u679c\u4e0b\u4e00\u4e2a\u6570\u636e\u9875\u4e2d\u8bb0\u5f55\u7684\u4e3b\u952e\u503c\u5c0f\u4e8e\u4e0a\u4e00\u4e2a\u6570\u636e\u9875\u4e2d\u8bb0\u5f55\u7684\u4e3b\u952e\u503c\uff0c\u90a3\u4e48\u5728\u8fdb\u884c\u8303\u56f4\u67e5\u8be2\u65f6\u5c31\u9700\u8981\u5728\u4e0d\u540c\u7684\u53f6\u5b50\u8282\u70b9\u4e4b\u95f4\u6765\u56de\u8df3\u8f6c\uff0c\u8fd9\u6837\u4f1a\u589e\u52a0IO\u64cd\u4f5c\u6b21\u6570\u548c\u67e5\u8be2\u65f6\u95f4\u3002<\/p>\n<p>\u56e0\u6b64\uff0c\u4e3a\u4e86\u4fdd\u8bc1\u8303\u56f4\u67e5\u8be2\u7684\u6548\u7387\uff0cB+\u6811\u8981\u6c42\u53f6\u5b50\u8282\u70b9\u4e2d\u8bb0\u5f55\u7684\u4e3b\u952e\u503c\u5fc5\u987b\u6309\u7167\u987a\u5e8f\u6392\u5217\uff0c\u5373\u4e0b\u4e00\u4e2a\u6570\u636e\u9875\u4e2d\u8bb0\u5f55\u7684\u4e3b\u952e\u503c\u5fc5\u987b\u5927\u4e8e\u4e0a\u4e00\u4e2a\u6570\u636e\u9875\u4e2d\u8bb0\u5f55\u7684\u4e3b\u952e\u503c\u3002\u8fd9\u6837\u53ef\u4ee5\u786e\u4fdd\u5728\u8fdb\u884c\u8303\u56f4\u67e5\u8be2\u65f6\u53ef\u4ee5\u987a\u5229\u5730\u6309\u7167\u4e3b\u952e\u503c\u7684\u987a\u5e8f\u8fdb\u884c\u904d\u5386\uff0c\u63d0\u9ad8\u67e5\u8be2\u6548\u7387\uff0c\u540c\u6837MySQL\u4e2d\u7684\u9884\u52a0\u8f7d\u9875\u529f\u80fd\u4e5f\u53ef\u4ee5\u51cf\u5c11IO\u64cd\u4f5c\u6b21\u6570\u3002<\/p>\n<p>\u5728<code>InnoDB<\/code>\u4e2d\uff0c\u5728\u5bf9\u9875\u4e2d\u7684\u8bb0\u5f55\u8fdb\u884c\u589e\u5220\u6539\u64cd\u4f5c\u65f6\uff0c\u5fc5\u987b\u901a\u8fc7\u4e00\u4e9b\u8bb0\u5f55\u79fb\u52a8\u7684\u64cd\u4f5c\u6765\u59cb\u7ec8\u4fdd\u8bc1\uff1a<strong>\u4e0b\u4e00\u4e2a\u6570\u636e\u9875\u4e2d\u7528\u6237\u7684\u8bb0\u5f55\u7684\u4e3b\u952e\u503c\u5fc5\u987b\u5927\u4e8e\u4e0a\u4e00\u4e2a\u9875\u4e2d\u7528\u6237\u8bb0\u5f55\u7684\u4e3b\u952e\u503c<\/strong>\uff0c\u5219\u8fd9\u4e2a\u8fc7\u7a0b\u4e5f\u6210\u4e3a<strong>\u9875\u5206\u88c2\u64cd\u4f5c<\/strong>\uff0c\u5373\u5728\u4e00\u4e2a\u6570\u636e\u9875\u4e2d\u63d2\u5165\u8bb0\u5f55\uff0c\u800c\u8be5\u6570\u636e\u9875\u5728\u63d2\u5165\u4e4b\u524d\u5df2\u7ecf\u6ee1\u4e86\uff0c\u5219\u9700\u8981\u7533\u8bf7\u4e00\u4e2a\u65b0\u7684\u6570\u636e\u9875\uff0c\u7136\u540e\u632a\u52a8\u90e8\u5206\u6570\u636e\u8fc7\u53bb\u3002<\/p>\n<p><strong>\u6761\u4ef6\u4e8c\uff1a\u9700\u8981\u7ed9\u6240\u6709\u7684\u6570\u636e\u9875\u5efa\u7acb\u4e00\u4e2a\u76ee\u5f55\u9875<\/strong><\/p>\n<p>\u7531\u4e8e\u6bcf\u4e2a\u6570\u636e\u9875\u7684\u7f16\u53f7\u53ef\u80fd\u5e76\u4e0d\u8fde\u7eed\uff0c\u56e0\u6b64\u9700\u8981\u4e3a\u8fd9\u4e9b\u6570\u636e\u9875\u5efa\u7acb\u4e00\u4e2a\u76ee\u5f55\u3002<\/p>\n<p>\u6bd4\u5982\u5f53\u6211\u4eec\u770b\u4e00\u672c\u4e66\u7684\u65f6\u5019\uff0c\u4e66\u7684\u76ee\u5f55\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u5feb\u901f\u5b9a\u4f4d\u5230\u6211\u4eec\u60f3\u770b\u7684\u5185\u5bb9\uff0c\u800c\u76ee\u5f55\u6807\u9898\u5bf9\u5e94\u7684\u9875\u53f7\u53ef\u4ee5\u6bd4\u4f5c\u6bcf\u4e2a\u6570\u636e\u9875\u7684\u9875\u53f7\uff0c\u901a\u8fc7\u4e66\u7684\u76ee\u5f55\u6211\u4eec\u53ef\u4ee5\u5feb\u901f\u5b9a\u4f4d\u5230\u6211\u4eec\u60f3\u770b\u7684\u5185\u5bb9\uff0c\u540c\u6837\u7684\u9053\u7406\uff0c\u901a\u8fc7\u4e3a\u6570\u636e\u9875\u5efa\u7acb\u76ee\u5f55\uff0c\u5728\u76ee\u5f55\u4e2d\u5b58\u50a8\u6570\u636e\u9875\u7684\u7f16\u53f7\uff0c\u5373\u53ef\u901a\u8fc7\u76ee\u5f55\u5feb\u901f\u5b9a\u4f4d\u5230\u76f8\u5e94\u7684\u6570\u636e\u9875\u3002<\/p>\n<p>\u76ee\u5f55\u9875\u53ef\u4ee5\u5305\u62ec\u4e24\u4e2a\u5185\u5bb9\uff1a<\/p>\n<ul>\n<li>\u6570\u636e\u9875\u7684\u8bb0\u5f55\u4e2d\u6700\u5c0f\u7684\u4e3b\u952e\u503c\uff0c\u7528<code>key<\/code>\u8868\u793a<\/li>\n<li>\u6570\u636e\u9875\u9875\u7f16\u53f7\uff0c\u7528<code>page_no<\/code>\u8868\u793a<\/li>\n<\/ul>\n<p>\u4e3a\u4e86\u65b9\u4fbf\u8bf4\u660e\uff0c\u6211\u4eec\u53ef\u4ee5\u5b9a\u4e49\u4e00\u4e2a\u6570\u636e\u8868\uff1a<\/p>\n<pre><code>CREATE TABLE `index_demo` (\n`a` int NOT NULL,\n`b` int DEFAULT NULL,\n`c` char(1) DEFAULT NULL,\nPRIMARY KEY (`a`)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci ROW_FORMAT=COMPACT;<\/code><\/pre>\n<p>\u4e0a\u8ff0\u8868\u5b9a\u4e49\u4e2d\uff0c\u4f7f\u7528\u4e86<code>COMPACT<\/code>\u884c\u683c\u5f0f\u6765\u5b58\u50a8\u6570\u636e\uff0c<code>COMPACT<\/code>\u884c\u683c\u5f0f\u7684\u7b80\u5316\u5b58\u50a8\u5982\u4e0b\uff1a<\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044668915\" alt=\"\" title=\"\"><\/p>\n<p>\u6211\u4eec\u5047\u8bbe\u6bcf\u4e2a\u6570\u636e\u9875\u6700\u591a\u53ea\u80fd\u5b58\u653e2\u6761\u8bb0\u5f55\uff08\u5b9e\u9645\u4e00\u4e2a\u6570\u636e\u9875\u975e\u5e38\u5927\uff0c\u53ef\u4ee5\u5b58\u653e\u8bb8\u591a\u7684\u8bb0\u5f55\uff09<\/p>\n<p>\u5f53\u4e3a\u6570\u636e\u9875\u7f16\u5236\u5176\u5bf9\u5e94\u7684\u76ee\u5f55\u9875\u65f6\uff0c\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044668916\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>\u6211\u4eec\u4ee5<code>\u987510<\/code>\u4e3a\u4f8b\uff0c\u4e3a\u5176\u7f16\u5236\u7684\u76ee\u5f55\u9879\u4e3a\u76ee\u5f55\u98791\uff0c\u8be5\u76ee\u5f55\u9879\u5305\u542b\u4e86\u8be5\u9875\u7684<code>\u9875\u53f710<\/code>\u4ee5\u53ca\u8be5\u9875\u7684\u6570\u636e\u8bb0\u5f55\u4e2d<code>\u4e3b\u952e\u503c\u6700\u5c0f\u7684\u503c1<\/code>\u3002\u5f53\u6211\u4eec\u628a\u8fd9\u4e9b\u76ee\u5f55\u9879\u5728\u7269\u7406\u5b58\u50a8\u5668\u4e2d\u8fde\u7eed\u5b58\u50a8\uff0c\u5c31\u53ef\u4ee5\u5b9e\u73b0\u6839\u636e\u4e3b\u952e\u5feb\u901f\u67e5\u627e\u67d0\u6761\u8bb0\u5f55\u7684\u529f\u80fd\u4e86\u3002\u4e3e\u4e2a\u4f8b\u5b50\uff0c\u5f53\u6211\u4eec\u60f3\u67e5\u8be2\u4e3b\u952e\u503c\u4e3a100\u7684\u8bb0\u5f55\u65f6\uff0c\u5177\u4f53\u7684\u67e5\u8be2\u8fc7\u7a0b\u5982\u4e0b\uff1a<\/p>\n<ul>\n<li>\u901a\u8fc7\u76ee\u5f55\u9879\uff0c\u6839\u636e\u4e8c\u5206\u67e5\u627e\u5feb\u901f\u5b9a\u4f4d\u5230\u4e3b\u952e\u503c\u4e3a<code>100<\/code>\u7684\u8bb0\u5f55\u5728\u76ee\u5f55\u98793\u4e2d\uff08\u56e0\u4e3a12 &lt; 100 &lt; 209\uff09\uff0c\u5176\u5bf9\u5e94\u7684\u6570\u636e\u9875\u9875\u53f7\u4e3a9<\/li>\n<li>\u518d\u6839\u636e\u4e0a\u8ff0\u804a\u5230\u7684\u5728\u5355\u4e2a\u9875\u4e2d\u67e5\u8be2\u8bb0\u5f55\u7684\u65b9\u5f0f\uff0c\u5373\u53ef\u5728\u98759\u4e2d\u67e5\u8be2\u5230\u4e3b\u952e\u503c\u4e3a<code>100<\/code>\u7684\u8bb0\u5f55\u3002<\/li>\n<\/ul>\n<h5>B+\u6811\u7684\u7ed3\u6784<\/h5>\n<p>\u4e0a\u8ff0\u6211\u4eec\u804a\u5230\u6784\u5efaB+\u6811\u7684\u6761\u4ef6\uff0c\u5176\u6838\u5fc3\u662f<strong>\u901a\u8fc7\u4f7f\u7528\u4e8c\u5206\u6cd5\u7684\u65b9\u5f0f\u5feb\u901f\u5b9a\u4f4d\u5230\u5177\u4f53\u7684\u76ee\u5f55\u9879\uff0c\u518d\u901a\u8fc7\u76ee\u5f55\u9879\u5feb\u901f\u5b9a\u4f4d\u5230\u6211\u4eec\u6240\u9700\u8981\u7684\u6570\u636e\u9875<\/strong>\u3002<\/p>\n<p>\u6211\u4eec\u5728\u804a\u5230\u7ed9\u6570\u636e\u9875\u8bb0\u5f55\u5efa\u7acb\u5176\u5bf9\u5e94\u7684\u76ee\u5f55\u9879\u65f6\uff0c\u6570\u636e\u9875\u5185\u7684\u6bcf\u6761\u8bb0\u5f55\u90fd\u4f1a\u6709<code>record_type<\/code>\u5b57\u6bb5\uff0c\u5b83\u7684\u5404\u4e2a\u53d6\u503c\u4ee3\u8868\u610f\u601d\u5982\u4e0b\uff1a<\/p>\n<ul>\n<li><code>0<\/code>\uff1a\u666e\u901a\u6570\u636e\u8bb0\u5f55\uff0c\u5373\u6211\u4eec\u63d2\u5165\u7684\u6570\u636e\u8bb0\u5f55<\/li>\n<li><code>2<\/code>\uff1a<code>Infimum<\/code>\u8bb0\u5f55\uff0c\u5728B+\u6811\u7d22\u5f15\u4e2d\uff0c<code>Infimum<\/code>\u8bb0\u5f55\u4f4d\u4e8e\u6574\u4e2a\u7d22\u5f15\u7684\u6700\u5de6\u8fb9\uff0c\u7528\u4e8e\u8868\u793a\u6ca1\u6709\u66f4\u5c0f\u503c\u7684\u60c5\u51b5\u3002<\/li>\n<li><code>3<\/code>\uff1a<code>Supermun<\/code>\u8bb0\u5f55\uff0c\u5728B+\u6811\u7d22\u5f15\u4e2d\uff0c<code>Supremum<\/code>\u8bb0\u5f55\u4f4d\u4e8e\u6574\u4e2a\u7d22\u5f15\u7684\u6700\u53f3\u8fb9\uff0c\u7528\u4e8e\u8868\u793a\u6ca1\u6709\u66f4\u5927\u503c\u7684\u60c5\u51b5\u3002<\/li>\n<\/ul>\n<p>\u4f60\u53ef\u80fd\u4f1a\u597d\u5947\uff0c\u53d6\u503c\u6709<code>0<\/code>\u3001<code>2<\/code>\u3001<code>3<\/code>\uff0c\u90a3\u53d6\u503c<code>1<\/code>\u662f\u4ec0\u4e48\u610f\u601d\u5462\uff1f<\/p>\n<p>\u6211\u4eec\u6ce8\u610f\u5230\uff0c\u5728\u76ee\u5f55\u9879\u4e2d\u5b58\u50a8\u4e24\u4e2a\u5b57\u6bb5\uff0c\u5206\u522b\u662f\u6700\u5c0f\u4e3b\u952e\u503c\u4ee5\u53ca\u5bf9\u5e94\u7684\u9875\u53f7\uff0c\u4e8b\u5b9e\u4e0a\uff0c<strong>\u5b58\u653e\u76ee\u5f55\u9879\u7684\u9875\u4e0e\u5b9e\u9645\u5b58\u653e\u6570\u636e\u7684\u6570\u636e\u9875\u5e76\u65e0\u533a\u522b<\/strong>\uff0c\u76ee\u5f55\u9879\u4e2d\u7684\u4e24\u4e2a\u5b57\u6bb5\uff08\u4e3b\u952e\u503c\u4ee5\u53ca\u9875\u53f7\uff09\u5b8c\u5168\u53ef\u4ee5\u770b\u4f5c\u662f\u5b58\u50a8\u7684\u5b9e\u9645\u6570\u636e\uff0c\u56e0\u6b64\uff0c\u76ee\u5f55\u9879\u4e2d\u8bb0\u5f55\u53ef\u4ee5\u79f0\u4f5c\u4e3a\u76ee\u5f55\u9879\u8bb0\u5f55\uff0c\u5373\u76ee\u5f55\u9875\uff0c\u90a3InnoDB\u662f\u5982\u4f55\u533a\u522b\u5b9e\u9645\u6570\u636e\u8bb0\u5f55\u4e0e\u76ee\u5f55\u9875\u8bb0\u5f55\u5462\uff0c\u7b54\u6848\u5c31\u662f<code>record_type<\/code>\u5b57\u6bb5\u7684\u53d6\u503c\u4e3a<code>1<\/code>\u6765\u8868\u793a\u76ee\u5f55\u9875\u8bb0\u5f55\u3002<\/p>\n<ul>\n<li><code>0<\/code>\uff1a\u666e\u901a\u6570\u636e\u8bb0\u5f55\uff0c\u5373\u6570\u636e\u9875\u8bb0\u5f55<\/li>\n<li><code>1<\/code>: \u76ee\u5f55\u9879\u8bb0\u5f55\uff0c\u5373\u76ee\u5f55\u9875\u8bb0\u5f55<\/li>\n<li><code>2<\/code>\uff1a<code>Infimum<\/code>\u8bb0\u5f55<\/li>\n<li><code>3<\/code>\uff1a<code>Supermun<\/code>\u8bb0\u5f55<\/li>\n<\/ul>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044668917\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>\u901a\u8fc7\u4e0a\u56fe\u53ef\u4ee5\u770b\u5230\uff0c\u6211\u4eec\u4f7f\u7528\u987530\u6765\u5b58\u653e\u76ee\u5f55\u9875\u8bb0\u5f55\uff0c\u76ee\u5f55\u9875\u8bb0\u5f55\u4e0e\u6570\u636e\u9875\u8bb0\u5f55\u7684\u4e0d\u540c\u70b9\u5728\u4e8e\uff1a<\/p>\n<ul>\n<li>\u76ee\u5f55\u9875\u8bb0\u5f55\u7684<code>record_type=1<\/code>\uff0c\u800c\u6570\u636e\u9875\u8bb0\u5f55\u7684<code>record_type=0<\/code><\/li>\n<li>\u76ee\u5f55\u9875\u8bb0\u5f55\u53ea\u5305\u542b\u4e3b\u952e\u503c(\u7d22\u5f15\u503c)\u548c\u9875\u53f7\uff0c\u800c\u6570\u636e\u9875\u8bb0\u5f55\u5219\u53ef\u4ee5\u7531\u7528\u6237\u6765\u81ea\u5b9a\u4e49\uff0c\u53ef\u4ee5\u5305\u542b\u5f88\u591a\u5217\u3002<\/li>\n<\/ul>\n<p>\u9664\u6b64\u4e4b\u5916\uff0c\u4e24\u8005\u5e76\u65e0\u5b9e\u9645\u7684\u533a\u522b\uff0c\u5728\u76ee\u5f55\u9875\u4e2d\uff0c\u540c\u6837\u53ef\u4ee5\u901a\u8fc7\u4e8c\u5206\u6cd5\u6765\u5feb\u901f\u5b9a\u4f4d\u5230\u76ee\u5f55\u9875\u8bb0\u5f55\uff0c\u518d\u901a\u8fc7\u76ee\u5f55\u9875\u8bb0\u5f55\u5411\u4e0b\u67e5\u8be2\u5230\u5176\u5bf9\u5e94\u7684\u6570\u636e\u9875\u3002<\/p>\n<p>\u5f53\u7136\uff0c\u5f53\u76ee\u5f55\u9875\u4e2d\u7684\u8bb0\u5f55\u8fc7\u591a\uff0c\u4e00\u4e2a\u76ee\u5f55\u9875\u96be\u4ee5\u5bb9\u7eb3\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u518d\u591a\u5206\u914d\u4e00\u4e2a\u5b58\u50a8\u76ee\u5f55\u9879\u7684\u9875\u5373\u53ef\u3002\u5f53\u540c\u5c42\u5b58\u5728\u591a\u4e2a\u76ee\u5f55\u9879\u65f6\uff0c\u6211\u4eec\u5219\u53ef\u4ee5\u5411\u4e0a\u518d\u5206\u914d\u66f4\u9ad8\u4e00\u7ea7\u7684\u76ee\u5f55\u9879\uff0c\u5373\u591a\u7ea7\u76ee\u5f55\u3002<\/p>\n<p>\u6211\u4eec\u53ef\u4ee5\u89c2\u5bdf\u5230\uff0c\u8fd9\u6837\u591a\u7ea7\u7684\u76ee\u5f55\uff0c\u4e0d\u5c31\u50cf\u4e00\u9897\u6811\u7684\u6570\u636e\u7ed3\u6784\u4e86\u5462\uff1f\u5176\u5b9e\uff0c\u8fd9\u5c31\u662f<code>InnoDB<\/code>\u7684<code>B+\u6811<\/code>\u7ed3\u6784\u3002<\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044668918\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<h5>B+\u6811\u7684\u7279\u70b9<\/h5>\n<p>\u65e0\u8bba\u662f\u5b58\u653e\u5b9e\u9645\u6570\u636e\u7684\u6570\u636e\u9875\uff0c\u8fd8\u662f\u5b58\u653e\u76ee\u5f55\u9879\u8bb0\u5f55\u7684\u76ee\u5f55\u9875\uff0c\u90fd\u53ef\u4ee5\u628a\u5b83\u4eec\u653e\u5230<code>B+\u6811<\/code>\u5f53\u4e2d\uff0c\u8fd9\u4e9b\u9875\u79f0\u4e3a<code>B+\u6811<\/code>\u7684\u8282\u70b9\u3002<\/p>\n<p>\u5176\u4e2d\uff0c\u5b58\u653e\u6211\u4eec\u63d2\u5165\u7684\u5b9e\u9645\u6570\u636e\u7684\u8bb0\u5f55\u5b58\u653e\u5728<code>B+\u6811<\/code>\u7684\u6700\u5e95\u5c42\u8282\u70b9\uff0c\u8fd9\u4e9b\u8282\u70b9\u79f0\u4e3a\u53f6\u5b50\u8282\u70b9\u3002\u5176\u4f59\u975e\u53f6\u5b50\u8282\u70b9\u5219\u7528\u6765\u5b58\u653e\u76ee\u5f55\u9879\u8bb0\u5f55\u3002\u5176\u4e2d<code>B+\u6811<\/code>\u6700\u4e0a\u5c42\u7684\u8282\u70b9\u79f0\u4e3a\u6839\u8282\u70b9\u3002<\/p>\n<p><code>B+\u6811<\/code>\u7684\u53f6\u5b50\u8282\u70b9\u4e4b\u95f4\u662f\u7528\u300c\u53cc\u5411\u94fe\u8868\u300d\u8fdb\u884c\u8fde\u63a5\uff0c\u8fd9\u6837\u7684\u597d\u5904\u662f\u65e2\u80fd\u5411\u53f3\u904d\u5386\uff0c\u4e5f\u80fd\u5411\u5de6\u904d\u5386\u3002<\/p>\n<h3>2\u3001\u6309\u7269\u7406\u5b58\u50a8\u5206\u7c7b<\/h3>\n<h4><strong>\u805a\u7c07\u7d22\u5f15\uff08\u4e3b\u952e\u7d22\u5f15\uff09<\/strong><\/h4>\n<p>\u805a\u7c07\u7d22\u5f15\uff0c\u53c8\u53ef\u4ee5\u79f0\u4e3a\u4e3b\u952e\u7d22\u5f15\uff0c\u5728\u521b\u5efa\u8868\u65f6\uff0cInnoDB\u4f1a\u9ed8\u8ba4\u4e3a\u4e3b\u952e\u521b\u5efa\u4e00\u68f5B+\u6811\u7684\u4e3b\u952e\u7d22\u5f15\u3002<\/p>\n<p><strong>\u805a\u7c07\u7d22\u5f15\u7684\u7279\u70b9<\/strong>\u5728\u4e8e\uff1a<\/p>\n<ul>\n<li>\u4f7f\u7528\u8bb0\u5f55\u7684\u4e3b\u952e\u503c\u5927\u5c0f\u6765\u5bf9\u8bb0\u5f55\u548c\u9875\u8fdb\u884c\u6392\u5e8f\u3002<\/li>\n<li>\u9875\uff08\u5305\u62ec\u53f6\u5b50\u8282\u70b9\u548c\u975e\u53f6\u5b50\u8282\u70b9\uff09\u5185\u7684\u8bb0\u5f55\u6309\u7167\u4e3b\u952e\u503c\u7684\u5927\u5c0f\u8fdb\u884c\u6392\u5e8f\u7ec4\u6210\u5355\u5411\u94fe\u8868\u3002\u9875\u5185\u7684\u8bb0\u5f55\u4f1a\u88ab\u5212\u5206\u4e3a\u82e5\u5e72\u7684\u7ec4\uff0c\u6bcf\u4e2a\u7ec4\u4e2d\u4e3b\u952e\u503c\u6700\u5927\u7684\u8bb0\u5f55\u5728\u9875\u5185\u7684\u504f\u79fb\u91cf\u4f1a\u88ab\u5f53\u505a\u8be5\u7ec4\u7684\u69fd\u653e\u5728\u9875\u76ee\u5f55\u4e2d\uff0c\u4ee5\u4fbf\u540e\u7eed\u53ef\u4ee5\u901a\u8fc7\u4e8c\u5206\u6cd5\u6765\u67e5\u627e\u5b9a\u4f4d\u5230\u9700\u8981\u67e5\u627e\u7684\u8bb0\u5f55\u3002<\/li>\n<li>\u5b58\u653e\u5b9e\u9645\u6570\u636e\u7684\u5404\u4e2a\u6570\u636e\u9875\uff08\u53f6\u5b50\u8282\u70b9\uff09\u540c\u6837\u4e5f\u6839\u636e\u4e3b\u952e\u5927\u5c0f\u6392\u6210\u53cc\u5411\u94fe\u8868\u3002<\/li>\n<li>\u5b58\u653e\u76ee\u5f55\u6570\u636e\u7684\u5404\u4e2a\u76ee\u5f55\u9875\uff08\u975e\u53f6\u5b50\u8282\u70b9\uff09\u53ef\u4ee5\u5206\u4e3aB+\u6811\u7684\u591a\u4e2a\u5c42\u7ea7\uff0c\u5728\u540c\u4e00\u5c42\u7ea7\u7684\u76ee\u5f55\u9875\u9875\u6839\u636e\u4e5f\u4e2d\u5b58\u50a8\u7684\u4e3b\u952e\u503c\u5927\u5c0f\u6765\u6392\u5e8f\u6210\u4e00\u4e2a\u53cc\u5411\u94fe\u8868\u3002<\/li>\n<li>B+\u6811\u7684\u53f6\u5b50\u8282\u70b9\u5b58\u653e\u7684\u662f\u5b8c\u6574\u7684\u6570\u636e\u8bb0\u5f55\uff0c\u5373\u4fdd\u5b58\u4e86\u8be5\u8bb0\u5f55\u7684\u6240\u6709\u5217\u7684\u503c\u3002<\/li>\n<\/ul>\n<p>\u5305\u542b\u4ee5\u4e0a\u4e24\u4e2a\u7279\u70b9\u7684B+\u6811\u79f0\u4e3a\u805a\u7c07\u7d22\u5f15\u3002<\/p>\n<h4><strong>\u975e\u805a\u7c07\u7d22\u5f15\uff08\u4e8c\u7ea7\u7d22\u5f15\uff09<\/strong><\/h4>\n<p>\u4e0d\u540c\u4e8e\u805a\u7c07\u7d22\u5f15\uff0c<strong>\u975e\u805a\u7c07\u7d22\u5f15\u5b58\u50a8\u7684\u5e76\u4e0d\u662f\u5b8c\u6574\u7684\u6570\u636e\uff0c\u975e\u805a\u7c07\u7d22\u5f15\u7684\u53f6\u5b50\u8282\u70b9\u5b58\u653e\u7684\u662f\u6307\u5b9a\u7684\u7d22\u5f15\u5217+\u4e3b\u952e\u503c<\/strong>\u3002\u975e\u805a\u7c07\u7d22\u5f15\u7684\u76ee\u5f55\u9875\u5b58\u50a8\u7684\u8bb0\u5f55\u4e2d\u4e0d\u518d\u662f\u4e3b\u952e+\u9875\u53f7\u7684\u642d\u914d\uff0c\u800c\u662f\u6307\u5b9a\u7684\u7d22\u5f15\u5217+\u9875\u53f7\u3002<\/p>\n<p>\u4ee5\u975e\u4e3b\u952e\u5217\u7684\u5927\u5c0f\u4e3a\u6392\u5e8f\u89c4\u5219\u800c\u5efa\u7acb\u7684B+\u6811\u9700\u8981\u6267\u884c\u56de\u8868\u64cd\u4f5c\u624d\u53ef\u4ee5\u5b9a\u4f4d\u5230\u5b8c\u6574\u7684\u7528\u6237\u8bb0\u5f55\uff0c\u8fd9\u79cdB+\u6811\u4e5f\u79f0\u4e3a\u4e8c\u7ea7\u7d22\u5f15\u6216\u8f85\u52a9\u7d22\u5f15\u3002<\/p>\n<p>\u540c\u6837\u975e\u805a\u7c07\u7d22\u5f15\u7684B+\u6811\u7684\u53f6\u5b50\u8282\u70b9\u4e5f\u4f1a\u6309\u7167\u7d22\u5f15\u5217\u6392\u5e8f\u5e76\u7ec4\u6210\u53cc\u5411\u94fe\u8868\uff0c\u540c\u4e00\u5c42\u7ea7\u7684\u76ee\u5f55\u9875\u4e5f\u4f1a\u6839\u636e\u7d22\u5f15\u5217\u7684\u5927\u5c0f\u6765\u6392\u5e8f\u7ec4\u6210\u53cc\u5411\u94fe\u8868\u3002<\/p>\n<h5>\u56de\u8868<\/h5>\n<p><strong>\u805a\u7c07\u7d22\u5f15\u548c\u975e\u805a\u7c07\u7d22\u5f15\u7684\u67e5\u8be2\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/strong><\/p>\n<p>\u5f53\u4f7f\u7528\u4e8c\u7ea7\u7d22\u5f15\u8fdb\u884c\u67e5\u8be2\u5b9a\u4f4d\u5230\u7b26\u5408\u6761\u4ef6\u7684\u8bb0\u5f55\u65f6\uff0c\u5f53\u7d22\u5f15\u4e2d\u5e76\u672a\u5b58\u50a8\u6211\u4eec\u9700\u8981\u67e5\u8be2\u7684\u5b57\u6bb5\u65f6\uff08\u975e\u805a\u7c07\u7d22\u5f15\u503c\u7684\u53f6\u5b50\u8282\u70b9\u53ea\u5b58\u50a8\u4e3b\u952e\u503c\u4ee5\u53ca\u6307\u5b9a\u7d22\u5f15\u503c\uff0c\u53ef\u80fd\u5b58\u5728\u9700\u8981\u67e5\u8be2\u7684\u5b57\u6bb5\u5e76\u672a\u5b58\u50a8\u5728\u7d22\u5f15B+\u6811\u4e2d\uff09\uff0c\u9700\u8981\u6839\u636e\u4e8c\u7ea7\u7d22\u5f15\u4e2d\u5b58\u50a8\u7684\u4e3b\u952e\u503c\uff0c\u56de\u8868\u5230\u4e3b\u952e\u7d22\u5f15\u67e5\u8be2\u5230\u5bf9\u5e94\u7684\u5b57\u6bb5\u624d\u80fd\u591f\u8fd4\u56de\u3002<\/p>\n<p>\u6839\u636e\u8be5\u8bb0\u5f55\u4e2d\u7684\u4e3b\u952e\u4fe1\u606f\u56de\u5230\u805a\u7c07\u7d22\u5f15\u4e2d\u67e5\u627e\u5230\u5b8c\u6574\u7684\u7528\u6237\u8bb0\u5f55\u3002\u901a\u8fc7\u643a\u5e26\u4e3b\u952e\u4fe1\u606f\u5230\u805a\u7c07\u7d22\u5f15\u4e2d\u91cd\u65b0\u5b9a\u4f4d\u5b8c\u6574\u7684\u7528\u6237\u8bb0\u5f55\u7684\u8fc7\u7a0b\u4e5f\u6210\u4e3a<strong>\u56de\u8868<\/strong>\u3002<\/p>\n<p>\u5728\u67e5\u8be2\u65f6\uff0c<strong>\u56de\u8868\u662f\u6709\u4ee3\u4ef7\u7684<\/strong>\uff0c\u6211\u4eec\u77e5\u9053\uff0c\u5728\u4f7f\u7528\u4e8c\u7ea7\u7d22\u5f15\u8fdb\u884c<strong>\u8303\u56f4\u67e5\u8be2<\/strong>\u7684\u65f6\u5019\uff0c\u4e8c\u7ea7\u7d22\u5f15\u5bf9\u5e94\u7684\u4e3b\u952e\u503c\u7684\u5927\u5c0f\u662f\u6beb\u65e0\u89c4\u5f8b\u7684\uff0c<strong>\u6bcf\u8bfb\u53d6\u4e00\u6761\u4e8c\u7ea7\u7d22\u5f15\u8bb0\u5f55\uff0c\u5c31\u9700\u8981\u6839\u636e\u8be5\u4e8c\u7ea7\u7d22\u5f15\u8bb0\u5f55\u7684\u4e3b\u952e\u503c\u5230\u805a\u7c07\u7d22\u5f15\u4e2d\u6267\u884c\u56de\u8868\u64cd\u4f5c<\/strong>\uff0c\u5982\u679c\u5bf9\u5e94\u7684\u805a\u7c07\u7d22\u5f15\u8bb0\u5f55\u6240\u5728\u7684\u9875\u9762\u4e0d\u5728\u5185\u5b58\u4e2d\uff0c\u5c31\u9700\u8981\u5c06\u8be5\u9875\u9762\u4ece\u78c1\u76d8\u52a0\u8f7d\u5230\u5185\u5b58\u4e2d\u7531\u4e8e\u8981\u8bfb\u53d6\u5f88\u591a\u4e3b\u952e\u503c\u5e76\u4e0d\u8fde\u7eed\u7684\u805a\u7c07\u7d22\u5f15\u8bb0\u5f55\uff0c\u800c\u8fd9\u4e9b\u805a\u7c07\u7d22\u5f15\u8bb0\u5f55\u5206\u5e03\u5728\u4e0d\u540c\u7684\u6570\u636e\u9875\u4e2d\uff0c\u8fd9\u4e9b\u6570\u636e\u9875\u7684\u9875\u53f7\u4e5f\u6beb\u65e0\u89c4\u5f8b\uff0c\u56e0\u6b64\u4f1a\u9020\u6210\u5927\u91cf\u7684\u968f\u673aI\/O\u3002<\/p>\n<p>\u9700\u8981\u6267\u884c\u56de\u8868\u64cd\u4f5c\u7684\u8bb0\u5f55\u8d8a\u591a\uff0c\u4f7f\u7528\u4e8c\u7ea7\u7d22\u5f15\u8fdb\u884c\u67e5\u8be2\u7684\u6027\u80fd\u5c31\u8d8a\u4f4e\uff0c\u56e0\u6b64\u5728\u67d0\u4e9b\u67e5\u8be2\u573a\u666f\u4e0b\uff0cMySQL\u4f18\u5316\u5668\u5b81\u613f\u4f7f\u7528\u5168\u8868\u626b\u63cf\u4e5f\u4e0d\u4f7f\u7528\u4e8c\u7ea7\u7d22\u5f15\uff0c\u800c<strong>\u9009\u62e9\u5168\u8868\u626b\u63cf\uff0c\u8fd8\u662f\u4e8c\u7ea7\u7d22\u5f15+\u56de\u8868\uff0c\u8fd9\u5c31\u662f\u67e5\u8be2\u4f18\u5316\u5668\u7684\u5de5\u4f5c\u4e86<\/strong>\u3002<\/p>\n<p>\u67e5\u8be2\u4f18\u5316\u5668\u4f1a\u4e8b\u5148\u9488\u5bf9\u8868\u4e2d\u7684\u8bb0\u5f55\u8ba1\u7b97\u4e00\u4e9b\u7edf\u8ba1\u6570\u636e\uff0c\u518d\u5229\u7528\u8fd9\u4e9b\u7edf\u8ba1\u6570\u636e\u6216\u8005\u8bbf\u95ee\u8868\u4e2d\u7684\u5c11\u91cf\u8bb0\u5f55\u6765\u8ba1\u7b97\u56de\u8868\u64cd\u4f5c\u7684\u8bb0\u5f55\u6570\uff0c\u5982\u679c\u9700\u8981\u6267\u884c\u56de\u8868\u64cd\u4f5c\u7684\u8bb0\u5f55\u6570\u8d8a\u591a\uff0c\u5c31\u8d8a\u503e\u5411\u4e8e\u4f7f\u7528\u5168\u8868\u626b\u63cf\uff0c\u53cd\u4e4b\u5219\u503e\u5411\u4e8e\u4f7f\u7528\u4e8c\u7ea7\u7d22\u5f15+\u56de\u8868\u3002<\/p>\n<p>\u65e2\u7136\u56de\u8868\u6709\u4e00\u5b9a\u7684\u4ee3\u4ef7\uff0c\u90a3<strong>\u4e3a\u4ec0\u4e48\u8fd8\u9700\u8981\u8fdb\u884c\u56de\u8868\u5462\uff1f<\/strong> \u5728\u521b\u5efa\u7d22\u5f15\u65f6\u76f4\u63a5\u5c31\u5b8c\u6574\u7684\u6570\u636e\u8bb0\u5f55\u653e\u5165\u7d22\u5f15\u7684\u53f6\u5b50\u8282\u70b9\u4e0d\u5c31\u597d\u4e86\u4e48\uff1f<\/p>\n<p>\u5982\u679c\u5b8c\u6574\u7684\u6570\u636e\u653e\u5165\u5230\u6bcf\u4e2a\u7d22\u5f15\u5efa\u7acb\u7684B+\u6811\u7684\u53f6\u5b50\u8282\u70b9\u4e2d\u786e\u5b9e\u53ef\u4ee5\u907f\u514d\u56de\u8868\uff0c\u4f46\u662f\u53d6\u800c\u4ee3\u4e4b\u7684\u662f\u9700\u8981\u66f4\u591a\u7684\u5b58\u50a8\u7a7a\u95f4\uff0c\u592a\u5360\u5730\u65b9\uff0c\u76f8\u5f53\u4e8e\u6bcf\u5efa\u7acb\u4e00\u68f5B+\u6811\u90fd\u9700\u8981\u5c06\u6240\u6709\u7684\u5b8c\u6574\u6570\u636e\u590d\u5236\u4e00\u904d\u3002<\/p>\n<h3>3\u3001\u6309\u5b57\u6bb5\u7279\u6027\u5206\u7c7b<\/h3>\n<h4><strong>\u4e3b\u952e\u7d22\u5f15<\/strong><\/h4>\n<p>\u4e3b\u952e\u7d22\u5f15\uff0c\u5373\u805a\u7c07\u7d22\u5f15\uff0c\u5efa\u7acb\u5728\u4e3b\u952e\u5b57\u6bb5\u4e0a\u7684\u7d22\u5f15\uff0c\u901a\u5e38\u5728\u521b\u5efa\u8868\u7684\u65f6\u5019\u4e00\u8d77\u521b\u5efa\uff0c\u4e00\u5f20\u8868\u6700\u591a\u53ea\u6709\u4e00\u4e2a\u4e3b\u952e\u7d22\u5f15\uff0c\u7d22\u5f15\u5217\u7684\u503c\u4e0d\u5141\u8bb8\u6709\u7a7a\u503c\u3002<\/p>\n<p>\u5728\u521b\u5efa\u8868\u65f6\uff0c\u521b\u5efa\u4e3b\u952e\u7d22\u5f15\u7684\u65b9\u5f0f\u5982\u4e0b\uff1a<\/p>\n<pre><code>CREATE TABLE table_name (\n...\nPRIMARY KEY (index_column_1) USING BTREE\n);<\/code><\/pre>\n<h4><strong>\u552f\u4e00\u7d22\u5f15<\/strong><\/h4>\n<p>\u552f\u4e00\u7d22\u5f15\u5efa\u7acb\u5728<code>UNIQUE<\/code>\u5b57\u6bb5\u4e0a\u7684\u7d22\u5f15\uff0c\u4e00\u5f20\u8868\u53ef\u4ee5\u6709\u591a\u4e2a\u552f\u4e00\u7d22\u5f15\uff0c\u7d22\u5f15\u5217\u7684\u503c\u5fc5\u987b\u552f\u4e00\uff0c\u4f46\u662f\u5141\u8bb8\u6709\u7a7a\u503c\u3002<\/p>\n<p>\u5728\u521b\u5efa\u8868\u65f6\uff0c\u521b\u5efa\u552f\u4e00\u7d22\u5f15\u7684\u65b9\u5f0f\u5982\u4e0b\uff1a<\/p>\n<pre><code>CREATE TABLE table_name (\n....\nUNIQUE KEY(index_column_1,index_column_2,...)\n);<\/code><\/pre>\n<p>\u5efa\u8868\u540e\uff0c\u5982\u679c\u8981\u521b\u5efa\u552f\u4e00\u7d22\u5f15\uff0c\u53ef\u4ee5\u4f7f\u7528\u8fd9\u9762\u8fd9\u6761\u547d\u4ee4\uff1a<\/p>\n<pre><code>CREATE UNIQUE INDEX index_name ON table_name(index_column_1,index_column_2,...);<\/code><\/pre>\n<h4><strong>\u666e\u901a\u7d22\u5f15<\/strong><\/h4>\n<p>\u666e\u901a\u7d22\u5f15\u5c31\u662f\u5efa\u7acb\u5728\u666e\u901a\u5b57\u6bb5\u4e0a\u7684\u7d22\u5f15\uff0c\u65e2\u4e0d\u8981\u6c42\u5b57\u6bb5\u4e3a\u4e3b\u952e\uff0c\u4e5f\u4e0d\u8981\u6c42\u5b57\u6bb5\u4e3a<code>UNIQUE<\/code>\u3002<\/p>\n<p>\u5728\u521b\u5efa\u8868\u65f6\uff0c\u521b\u5efa\u666e\u901a\u7d22\u5f15\u7684\u65b9\u5f0f\u5982\u4e0b\uff1a<\/p>\n<pre><code>CREATE TABLE table_name (\n....\nINDEX(index_column_1,index_column_2,...)\n);<\/code><\/pre>\n<p>\u5efa\u8868\u540e\uff0c\u5982\u679c\u8981\u521b\u5efa\u666e\u901a\u7d22\u5f15\uff0c\u53ef\u4ee5\u4f7f\u7528\u8fd9\u9762\u8fd9\u6761\u547d\u4ee4\uff1a<\/p>\n<pre><code>CREATE INDEX index_name ON table_name(index_column_1,index_column_2,...);<\/code><\/pre>\n<h4><strong>\u524d\u7f00\u7d22\u5f15<\/strong><\/h4>\n<p><strong>\u524d\u7f00\u7d22\u5f15\u662f\u6307\u5bf9\u5b57\u7b26\u7c7b\u578b\u5b57\u6bb5\u7684\u524d\u51e0\u4e2a\u5b57\u7b26\u5efa\u7acb\u7684\u7d22\u5f15\uff0c\u800c\u4e0d\u662f\u5728\u6574\u4e2a\u5b57\u6bb5\u4e0a\u5efa\u7acb\u7684\u7d22\u5f15<\/strong>\u3002\u524d\u7f00\u7d22\u5f15\u53ef\u4ee5\u5efa\u7acb\u5728\u5b57\u6bb5\u7c7b\u578b\u4e3achar\u3001varchar\u3001binary\u3001varbinary\u7684\u5217\u4e0a\u3002<\/p>\n<p><strong>\u4f7f\u7528\u524d\u7f00\u7d22\u5f15\u7684\u76ee\u7684\u662f\u4e3a\u4e86\u51cf\u5c11\u7d22\u5f15\u5360\u7528\u7684\u5b58\u50a8\u7a7a\u95f4\uff0c\u63d0\u5347\u67e5\u8be2\u6548\u7387<\/strong>\u3002<\/p>\n<pre><code>CREATE TABLE table_name(\n....\nINDEX(column_name(length))\n);<\/code><\/pre>\n<p>\u5efa\u8868\u540e\uff0c\u5982\u679c\u8981\u521b\u5efa\u524d\u7f00\u7d22\u5f15\uff0c\u53ef\u4ee5\u4f7f\u7528\u8fd9\u9762\u8fd9\u6761\u547d\u4ee4\uff1a<\/p>\n<pre><code>CREATE INDEX index_name ON table_name(column_name(length));<\/code><\/pre>\n<h3>4\u3001\u6309\u5b57\u6bb5\u4e2a\u6570\u5206\u7c7b<\/h3>\n<h4><strong>\u5355\u5217\u7d22\u5f15<\/strong><\/h4>\n<p>\u5f53\u521b\u5efa\u7d22\u5f15\u65f6\uff0c\u6307\u5b9a\u67d0\u4e00\u4e2a\u5b57\u6bb5\u4f5c\u4e3a\u7d22\u5f15\u5217\uff0c\u5efa\u7acb\u5728\u5355\u5217\u4e0a\u7684\u7d22\u5f15\u79f0\u4e3a\u5355\u5217\u7d22\u5f15\uff0c\u6bd4\u5982\u4e3b\u952e\u7d22\u5f15\u3002<\/p>\n<h4><strong>\u8054\u5408\u7d22\u5f15<\/strong><\/h4>\n<p>\u8054\u5408\u7d22\u5f15\u987e\u540d\u601d\u4e49\uff0c\u5373\u6307\u5b9a\u591a\u4e2a\u5b57\u6bb5\u5217\u6765\u4f5c\u4e3a\u7d22\u5f15\u5217\uff0c\u540c\u65f6\u4ee5\u591a\u4e2a\u5217\u7684\u5927\u5c0f\u4f5c\u4e3a\u6392\u5e8f\u89c4\u5219\uff0c\u5373\u540c\u65f6\u4e3a\u591a\u4e2a\u5217\u5efa\u7acb\u7d22\u5f15\u3002<\/p>\n<p>\u4f8b\u5982\u5efa\u7acb\u8054\u5408\u7d22\u5f15(a,b)\uff0c\u5219\u5728\u521b\u5efa\u7684B+\u6811\u4e2d\uff0c\u8bb0\u5f55\u7684\u6392\u5e8f\u65b9\u5f0f\u4e3a\uff1a<\/p>\n<ul>\n<li>\u5148\u5c06\u5404\u4e2a\u8bb0\u5f55\u548c\u9875\u6309\u7167a\u5217\u8fdb\u884c\u6392\u5e8f<\/li>\n<li>\u5728\u8bb0\u5f55\u7684a\u5217\u76f8\u540c\u7684\u60c5\u51b5\u4e0b\uff0c\u518d\u91c7\u7528b\u5217\u8fdb\u884c\u6392\u5e8f<\/li>\n<\/ul>\n<p>\u5728\u8054\u5408\u7d22\u5f15(a,b)\u7684B+\u6811\u4e2d\uff0c\u5b58\u50a8\u7684\u5185\u5bb9\u4e3a\uff1a<\/p>\n<ul>\n<li>\u975e\u53f6\u5b50\u8282\u70b9\u4e2d\uff0c\u6bcf\u6761\u76ee\u5f55\u9879\u8bb0\u5f55\u90fd\u6709a\u5217\u3001b\u5217\u3001\u9875\u53f73\u4e2a\u90e8\u5206\u7ec4\u6210\u3002\u5404\u6761\u8bb0\u5f55\u5148\u6309\u7167a\u5217\u7684\u503c\u8fdb\u884c\u6392\u5e8f\uff0c\u5982\u679c\u8bb0\u5f55\u7684a\u5217\u76f8\u540c\uff0c\u5219\u6309\u7167b\u5217\u7684\u503c\u8fdb\u884c\u6392\u5e8f<\/li>\n<li>\u53f6\u5b50\u8282\u70b9\u4e2d\uff0c\u6570\u636e\u9875\u8bb0\u5f55\u7531a\u5217\u3001b\u5217\u548c\u4e3b\u952e\u5217\u4e09\u90e8\u5206\u7ec4\u6210\uff1b<\/li>\n<\/ul>\n<p><strong>\u4f7f\u7528\u8054\u5408\u7d22\u5f15\u65f6\uff0c\u5b58\u5728\u6700\u5de6\u5339\u914d\u539f\u5219<\/strong>\uff0c\u5373\u6309\u7167\u6700\u5de6\u4f18\u5148\u7684\u65b9\u5f0f\u8fdb\u884c\u7d22\u5f15\u7684\u5339\u914d\u3002<\/p>\n<p>\u4e3e\u4e2a\u4f8b\u5b50\uff1a<\/p>\n<p>\u5f53\u6211\u4eec\u521b\u5efa<code>\u8054\u5408\u7d22\u5f15\uff08name, age\uff09<\/code>\u65f6\uff0c\u5982\u679c\u4f60\u8981\u67e5\u7684\u662f\u6240\u6709\u540d\u5b57\u7b2c\u4e00\u4e2a\u5b57\u662f<code>&quot;\u5f20&quot;<\/code>\u7684\u4eba\uff0c\u4f60\u7684SQL\u8bed\u53e5\u7684\u6761\u4ef6\u662f<code>where name like '\u5f20%'<\/code>\u3002\u8fd9\u65f6\u8fd9\u6761SQL\u80fd\u591f\u7528\u4e0a\u8fd9\u4e2a\u8054\u5408\u7d22\u5f15\u3002<\/p>\n<p>\u4ece\u4e0a\u8ff0\u7684\u4f8b\u5b50\u53ef\u4ee5\u770b\u51fa\uff0c\u5728\u5bf9name\u5b57\u6bb5\u8fdb\u884c\u5355\u5217\u6761\u4ef6\u67e5\u8be2\u65f6\uff0c\u540c\u6837\u80fd\u591f\u4f7f\u7528\u4e0a\u8be5\u8054\u5408\u7d22\u5f15\uff0c\u5373<code>\u8054\u5408\u7d22\u5f15\uff08name, age\uff09<\/code>\u53ef\u4ee5\u7b49\u6548\u4e8e<code>\u5355\u5217\u7d22\u5f15\uff08name\uff09<\/code>\u3002<\/p>\n<p>\u56e0\u6b64\uff0c\u5728\u5efa\u7acb\u8054\u5408\u7d22\u5f15\u7684\u65f6\u5019\uff0c\u5982\u4f55\u5b89\u6392\u7d22\u5f15\u5185\u7684\u5b57\u6bb5\u987a\u5e8f\u5462\uff1f<\/p>\n<p>\u8bc4\u4f30\u6807\u51c6\u662f\u7d22\u5f15\u7684\u590d\u7528\u80fd\u529b\u3002\u5982\u679c\u901a\u8fc7\u8c03\u6574\u987a\u5e8f\uff0c\u53ef\u4ee5\u5c11\u7ef4\u62a4\u4e00\u4e2a\u7d22\u5f15\uff0c\u90a3\u4e48\u8fd9\u4e2a\u987a\u5e8f\u5f80\u5f80\u5c31\u662f\u9700\u8981\u4f18\u5148\u8003\u8651\u91c7\u7528\u7684\u3002\u4f8b\u5982\u4e0a\u8ff0\u7684\u4f8b\u5b50\uff0c\u901a\u8fc7<code>\u8054\u5408\u7d22\u5f15\uff08name\uff0cage\uff09<\/code>\u7684\u987a\u5e8f\uff0c\u53ef\u4ee5\u8ba9\u6211\u4eec\u5c11\u7ef4\u62a4\u4e00\u4e2a<code>\u5355\u5217\u7d22\u5f15\uff08name\uff09<\/code>\u3002\u5f53\u7136<code>age<\/code>\u3002<\/p>\n<h2>\u4e09\u3001\u7d22\u5f15\u7684\u4f18\u7f3a\u70b9<\/h2>\n<p>\u5728\u4e86\u89e3\u4e86B+\u6811\u7684\u7d22\u5f15\u7ed3\u6784\u540e\uff0c\u6211\u4eec\u77e5\u9053\u6070\u5f53\u7684\u7d22\u5f15\u4f7f\u7528\u53ef\u4ee5\u4e3a\u6211\u4eec\u5e26\u6765\u6781\u5927\u7684\u67e5\u8be2\u6548\u7387\uff0c\u63d0\u9ad8\u6027\u80fd\u3002\u4f46\u662f\u7d22\u5f15\u4e5f\u5e76\u975e\u6ca1\u6709\u7f3a\u70b9\uff0c\u4e86\u89e3\u597d\u7d22\u5f15\u7684\u4f18\u7f3a\u70b9\uff0c\u9009\u62e9\u4f7f\u7528\u7d22\u5f15\u65f6\uff0c\u9700\u8981\u7efc\u5408\u8003\u8651\u7d22\u5f15\u7684\u4f18\u70b9\u548c\u7f3a\u70b9\uff0c\u624d\u80fd\u8ba9\u6211\u4eec\u5728\u5b9e\u9645\u4f7f\u7528\u7d22\u5f15\u7684\u8fc7\u7a0b\u4e2d\u5f97\u5fc3\u5e94\u624b\u3002<\/p>\n<h3>1\u3001\u4f18\u70b9<\/h3>\n<ul>\n<li>\u63d0\u9ad8\u6570\u636e\u68c0\u7d22\u7684\u6548\u7387\uff0c\u964d\u4f4e\u6570\u636e\u5e93\u7684I\/O\u6210\u672c\uff0c\u5c06\u968f\u673aI\/O\u8f6c\u53d8\u4e3a\u987a\u5e8fI\/O\uff0c\u8fd9\u662f\u521b\u5efa\u7d22\u5f15\u6700\u4e3b\u8981\u7684\u539f\u56e0\uff1b<\/li>\n<li>\u901a\u8fc7\u521b\u5efa\u552f\u4e00\u7d22\u5f15\uff0c\u53ef\u4ee5\u4fdd\u8bc1\u6570\u636e\u5e93\u8868\u4e2d\u6bcf\u4e00\u884c\u6570\u636e\u7684\u552f\u4e00\u6027\uff1b<\/li>\n<li>\u7531\u4e8e\u7d22\u5f15\u4e2d\u8bb0\u5f55\u7684\u5b58\u50a8\u987a\u5e8f\uff0c\u5728\u4f7f\u7528\u5206\u7ec4\u548c\u6392\u5e8f\u5b50\u53e5\u8fdb\u884c\u6570\u636e\u67e5\u8be2\u65f6\uff0c\u53ef\u4ee5\u663e\u8457\u51cf\u5c11\u67e5\u8be2\u4e2d\u5206\u7ec4\u548c\u6392\u5e8f\u7684\u65f6\u95f4\uff0c\u5373\u5e2e\u52a9\u670d\u52a1\u5668\u907f\u514d\u6392\u5e8f\u548c\u4e34\u65f6\u8868\uff0c\u964d\u4f4e\u4e86CPU\u7684\u6d88\u8017\u3002<\/li>\n<li>\u53ef\u4ee5\u52a0\u901f\u8868\u548c\u8868\u4e4b\u95f4\u7684\u8fde\u63a5\uff0c\u5373\u5bf9\u4e8e\u6709\u4f9d\u8d56\u5173\u7cfb\u7684\u5b50\u8868\u548c\u7236\u8868\u8054\u5408\u67e5\u8be2\u65f6\uff0c\u53ef\u4ee5\u63d0\u9ad8\u591a\u8868\u67e5\u8be2\u7684\u901f\u5ea6\u3002<\/li>\n<\/ul>\n<h3>2\u3001\u7f3a\u70b9<\/h3>\n<p>\u521b\u5efa\u7d22\u5f15\u548c\u7ef4\u62a4\u7d22\u5f15\u8981\u8017\u8d39\u65f6\u95f4 \uff0c\u5e76\u4e14\u968f\u7740\u6570\u636e\u91cf\u7684\u589e\u52a0\uff0c\u6240\u8017\u8d39\u7684\u65f6\u95f4\u4e5f\u4f1a\u589e\u52a0\u3002<\/p>\n<ul>\n<li><strong>\u7d22\u5f15\u9700\u8981\u5360\u78c1\u76d8\u7a7a\u95f4<\/strong><\/li>\n<\/ul>\n<p>\u6bcf\u4e2a\u7d22\u5f15\u5728\u521b\u5efa\u540e\uff0c\u9700\u8981\u5360\u4e00\u5b9a\u7684\u7269\u7406\u7a7a\u95f4\u5b58\u50a8\u5728\u78c1\u76d8\u4e0a\uff0c\u56e0\u4e3a\u6bcf\u5efa\u7acb\u4e00\u4e2a\u7d22\u5f15\uff0c\u90fd\u8981\u4e3a\u5b83\u5efa\u7acb\u4e00\u68f5B+\u6811\u3002\u6bcf\u4e00\u68f5B+\u6811\u7684\u6bcf\u4e00\u4e2a\u8282\u70b9\u90fd\u662f\u4e00\u4e2a\u6570\u636e\u9875\u3002<\/p>\n<p>\u4e00\u4e2a\u6570\u636e\u9875\u9ed8\u8ba4\u5360\u7528 16KB \u7684\u5b58\u50a8\u7a7a\u95f4\uff0c\u800c\u4e00\u68f5\u5f88\u5927\u7684B+\u6811\u7531\u8bb8\u591a\u6570\u636e\u9875\u7ec4\u6210\uff0c\u8fd9\u5c06\u4f1a\u5360\u7528\u5f88\u5927\u7684\u4e00\u7247\u5b58\u50a8\u7a7a\u95f4\u3002<\/p>\n<p>\u5982\u679c\u6709\u5927\u91cf\u7684\u7d22\u5f15\uff0c\u7d22\u5f15\u6587\u4ef6\u5c31\u53ef\u80fd\u6bd4\u6570\u636e\u6587\u4ef6\u66f4\u5feb\u8fbe\u5230\u6700\u5927\u6587\u4ef6\u5c3a\u5bf8\u3002<\/p>\n<ul>\n<li><strong>\u867d\u7136\u7d22\u5f15\u5927\u5927\u63d0\u9ad8\u4e86\u67e5\u8be2\u901f\u5ea6\uff0c\u540c\u65f6\u5374\u4f1a\u964d\u4f4e\u66f4\u65b0\u8868\u7684\u901f\u5ea6<\/strong><\/li>\n<\/ul>\n<p>\u5f53\u5bf9\u8868\u4e2d\u7684\u6570\u636e\u8fdb\u884c\u589e\u52a0\u3001\u5220\u9664\u548c\u4fee\u6539\u7684\u65f6\u5019\uff0c\u7d22\u5f15\u4e5f\u8981\u52a8\u6001\u5730\u7ef4\u62a4\uff0c\u5373\u90fd\u9700\u8981\u4fee\u6539\u5404\u4e2aB+\u6811\u7d22\u5f15\uff0c\u8fd9\u6837\u5c31\u964d\u4f4e\u4e86\u6570\u636e\u7684\u7ef4\u62a4\u901f\u5ea6\u3002<\/p>\n<p>\u589e\u5220\u6539\u64cd\u4f5c\u53ef\u80fd\u4f1a\u5bf9\u8282\u70b9\u548c\u8bb0\u5f55\u7684\u6392\u5e8f\u9020\u6210\u7834\u574f\uff0c\u6240\u4ee5\u5b58\u50a8\u5f15\u64ce\u9700\u8981\u989d\u5916\u7684\u65f6\u95f4\u8fdb\u884c\u9875\u9762\u5206\u88c2\u3001\u9875\u9762\u56de\u6536\u7b49\u64cd\u4f5c\uff0c\u4ee5\u7ef4\u62a4\u8282\u70b9\u548c\u8bb0\u5f55\u7684\u6392\u5e8f\u3002<\/p>\n<ul>\n<li><strong>\u5f71\u54cd\u4f18\u5316\u5668\u6267\u884c\u6548\u7387<\/strong><\/li>\n<\/ul>\n<p>\u5728\u6267\u884c\u67e5\u8be2\u8bed\u53e5\u524d\uff0c\u9996\u5148\u8981\u751f\u6210\u4e00\u4e2a\u6267\u884c\u8ba1\u5212\u3002<\/p>\n<p>\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u4e00\u6761\u67e5\u8be2\u8bed\u53e5\u5728\u6267\u884c\u8fc7\u7a0b\u4e2d\u6700\u591a\u4f7f\u7528\u4e00\u4e2a\u4e8c\u7ea7\u7d22\u5f15\uff0c\u5728\u751f\u6210\u6267\u884c\u8ba1\u5212\u65f6\u9700\u8981\u8ba1\u7b97\u4f7f\u7528\u4e0d\u540c\u7d22\u5f15\u6267\u884c\u67e5\u8be2\u65f6\u6240\u9700\u7684\u6210\u672c\uff0c\u6700\u540e\u9009\u53d6\u6210\u672c\u6700\u4f4e\u7684\u90a3\u4e2a\u7d22\u5f15\u6267\u884c\u67e5\u8be2\uff0c\u5982\u679c\u6b64\u65f6\u5efa\u4e86\u592a\u591a\u7684\u7d22\u5f15\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6210\u672c\u5206\u6790\u8fc7\u7a0b\u8017\u65f6\u592a\u591a\uff0c\u4ece\u800c\u5f71\u54cd\u67e5\u8be2\u8bed\u53e5\u7684\u6267\u884c\u6027\u80fd\u3002<\/p>\n<h2>\u56db\u3001\u7d22\u5f15\u4f7f\u7528\u573a\u666f<\/h2>\n<p>\u7d22\u5f15\u6700\u5927\u7684\u597d\u5904\u662f\u63d0\u9ad8\u67e5\u8be2\u901f\u5ea6\uff0c\u4f46\u662f\u7d22\u5f15\u4f7f\u7528\u4e0d\u5f53\u5219\u4f1a\u51fa\u73b0\u4e0a\u8ff0\u63cf\u8ff0\u7684\u7f3a\u70b9\u6240\u5e26\u6765\u7684\u5f71\u54cd\u3002\u56e0\u6b64\uff0c\u7d22\u5f15\u4e0d\u662f\u4e07\u80fd\u94a5\u5319\uff0c\u5b83\u4e5f\u662f\u6839\u636e\u573a\u666f\u6765\u4f7f\u7528\u7684\u3002<\/p>\n<p>\u90a3\u4e48\u5728\u4ec0\u4e48\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u8be5\u4f7f\u7528\u7d22\u5f15\u5462\uff1f<\/p>\n<h3>1\u3001\u9002\u7528\u7d22\u5f15\u7684\u573a\u666f<\/h3>\n<ul>\n<li><strong>\u5b57\u6bb5\u9700\u8981\u552f\u4e00\u6027\u9650\u5236<\/strong><\/li>\n<\/ul>\n<p>\u5f53\u4e1a\u52a1\u4e2d\u67d0\u4e2a\u5b57\u6bb5\u9700\u8981\u552f\u4e00\u6027\u9650\u5236\u65f6\uff0c\u9664\u4e86\u5728\u4e1a\u52a1\u903b\u8f91\u5c42\u9762\u6821\u9a8c\uff0c\u6700\u540e\u4e00\u9053\u9632\u7ebf\u5219\u662f\u901a\u8fc7\u552f\u4e00\u7d22\u5f15\u6765\u9650\u5236\u5b57\u6bb5\u552f\u4e00\u3002<\/p>\n<ul>\n<li>\u7ecf\u5e38\u7528\u4e8e<code>WHERE<\/code>\u67e5\u8be2\u6761\u4ef6\u7684\u5b57\u6bb5<\/li>\n<\/ul>\n<p>\u5bf9\u7ecf\u5e38\u7528\u4e8e<code>WHERE<\/code>\u67e5\u8be2\u6761\u4ef6\u7684\u5b57\u6bb5\u5efa\u7acb\u7d22\u5f15\uff0c\u80fd\u591f\u63d0\u9ad8\u6574\u4e2a\u8868\u7684\u67e5\u8be2\u901f\u5ea6\uff0c\u5c24\u5176\u662f\u5728\u6570\u636e\u91cf\u5927\u7684\u60c5\u51b5\u4e0b\uff0c\u521b\u5efa\u7d22\u5f15\u5c31\u53ef\u4ee5\u5927\u5e45\u63d0\u5347\u6570\u636e\u67e5\u8be2\u7684\u6548\u7387\u3002<\/p>\n<ul>\n<li>\u7ecf\u5e38\u7528\u4e8e<code>GROUP BY<\/code>\u548c<code>ORDER BY<\/code>\u7684\u5b57\u6bb5<\/li>\n<\/ul>\n<p>\u5bf9\u4e8e\u7ecf\u5e38\u7528\u4e8e<code>GROUP BY<\/code>\u548c<code>ORDER BY<\/code>\u7684\u5b57\u6bb5\uff0c\u5efa\u7acb\u7d22\u5f15\uff0c\u5229\u7528\u7d22\u5f15\u5176\u6309\u7d22\u5f15\u5b57\u6bb5\u503c\u987a\u5e8f\u5b58\u50a8\u6570\u636e\u7684\u7279\u6027\uff0c\u51cf\u5c11\u6392\u5e8f\u4e0e\u4e34\u65f6\u8868\u5e26\u6765\u7684\u635f\u8017\u3002<\/p>\n<ul>\n<li>\u5bf9<code>DISTINCT<\/code>\u5b57\u6bb5\u521b\u5efa\u7d22\u5f15<\/li>\n<\/ul>\n<p>\u6709\u65f6\u5019\u9700\u8981\u5bf9\u67d0\u4e2a\u5b57\u6bb5\u8fdb\u884c\u53bb\u91cd\uff0c\u4f7f\u7528<code>DISTINCT<\/code>\uff0c\u90a3\u4e48\u5bf9\u8fd9\u4e2a\u5b57\u6bb5\u521b\u5efa\u7d22\u5f15\uff0c\u4e5f\u4f1a\u63d0\u5347\u67e5\u8be2\u6548\u7387\u3002\u56e0\u4e3a\u5f53\u53bb\u91cd\u5b57\u6bb5\u521b\u5efa\u4e86\u7d22\u5f15\u540e\u662f\u6309\u7167\u987a\u5e8f\u9012\u589e\u7684\uff0c\u6240\u4ee5\u5728\u53bb\u91cd\u7684\u65f6\u5019\u4f1a\u5feb\u5f88\u591a\u3002<\/p>\n<ul>\n<li>\u5728\u591a\u4e2a\u5b57\u6bb5\u90fd\u8981\u521b\u5efa\u7d22\u5f15\u7684\u60c5\u51b5\u4e0b\uff0c\u8054\u5408\u7d22\u5f15\u4f18\u4e8e\u5355\u503c\u7d22\u5f15<\/li>\n<\/ul>\n<h3>2\u3001\u4e0d\u9002\u7528\u7d22\u5f15\u7684\u573a\u666f<\/h3>\n<ul>\n<li><code>WHERE<\/code>\u6761\u4ef6\u3001<code>GROUP BY<\/code>\u6761\u4ef6\u3001<code>ORDER BY<\/code>\u6761\u4ef6\u4e2d\u7528\u4e0d\u5230\u7684\u5b57\u6bb5<\/li>\n<\/ul>\n<p>\u7d22\u5f15\u7684\u4ef7\u503c\u662f\u5feb\u901f\u5b9a\u4f4d\uff0c\u5982\u679c\u8d77\u4e0d\u5230\u5b9a\u4f4d\u7684\u5b57\u6bb5\u901a\u5e38\u662f\u4e0d\u9700\u8981\u521b\u5efa\u7d22\u5f15\u7684\uff0c\u56e0\u4e3a\u7d22\u5f15\u662f\u4f1a\u5360\u7528\u7269\u7406\u7a7a\u95f4\u7684\u3002<\/p>\n<ul>\n<li>\u8868\u6570\u636e\u592a\u5c11\u7684\u65f6\u5019\uff0c\u53ef\u4ee5\u8003\u8651\u4e0d\u9700\u8981\u521b\u5efa\u7d22\u5f15<\/li>\n<li>\u7ecf\u5e38\u66f4\u65b0\u7684\u5b57\u6bb5\u4e0d\u7528\u521b\u5efa\u7d22\u5f15<\/li>\n<\/ul>\n<p>\u7ecf\u5e38\u66f4\u65b0\u7684\u5b57\u6bb5\u4e0d\u7528\u521b\u5efa\u7d22\u5f15\uff0c\u6bd4\u5982\u4e0d\u8981\u7528\u6237\u4f59\u989d\u5efa\u7acb\u7d22\u5f15\uff0c\u56e0\u4e3a\u7d22\u5f15\u5b57\u6bb5\u9891\u7e41\u4fee\u6539\uff0c\u7531\u4e8e\u8981\u7ef4\u62a4 B+Tree\u7684\u6709\u5e8f\u6027\uff0c\u90a3\u4e48\u5c31\u9700\u8981\u9891\u7e41\u7684\u91cd\u5efa\u7d22\u5f15\uff0c\u8fd9\u4e2a\u8fc7\u7a0b\u662f\u4f1a\u5f71\u54cd\u6570\u636e\u5e93\u6027\u80fd\u7684\u3002<\/p>\n<p>\u672c\u6587\u6765\u81ea <a target=\"_blank\" href=\"https:\/\/link.segmentfault.com\/?enc=swyt36Skqu%2BgeZBGGSZXog%3D%3D.JKQ%2BoKx6FTuEKBvGSVJpYAymM4hQifXLt7TJTlioG%2BEghur9AiNzsb1b0uEItz2L8zzxKnNd9jyNqrllQ2697mAslY9Y83QRiPZ8FTOpdsRsVxNP9x3FjtYIVSdyx%2B6K4lYdfGZ%2FtSJMleQo3I00NG%2FoYdKlzXmX%2FKjj8EAecC7fhZ16uTzAIduKyZDMx8XCbXq6k49reeWbzQ%2B29hQJkH0dNM31RMJhg%2BMoK1e%2B30bZTrg9GS7wk8kyj3ETAFjY8yrw%2BGRnbiYLCavSpnQKu7VvMIkMuNJDNeKbghlUXhc%3D\" rel=\"noopener noreferrer\">Go\u5c31\u4e1a\u8bad\u7ec3\u8425<\/a> \u5c0f\u97ec\u540c\u5b66\u7684\u6295\u7a3f\u3002<\/p>\n<h2>\u53c8\u51fa\u6210\u7ee9\u5566<\/h2>\n<p><a target=\"_blank\" href=\"https:\/\/link.segmentfault.com\/?enc=aePaEKdR3d9MpBs%2BXk4sGQ%3D%3D.tH%2FuJWxtCv%2F60hCzNBC1fFzCBc%2B6fNh%2FKUK0HbQ5qsPkbNjU8UgNe8ahbL05Y5C1cOSa5sSgLk2SnC284%2FPbqQ%3D%3D\" rel=\"noopener noreferrer\">\u6211\u4eec\u53c8\u51fa\u6210\u7ee9\u5566\uff01\u5927\u5382Offer\u96c6\u9526\uff01\u9065\u9065\u9886\u5148\uff01<\/a><\/p>\n<p><a target=\"_blank\" href=\"https:\/\/link.segmentfault.com\/?enc=eadENkwab93g%2BbTyrziBnA%3D%3D.xOAQUfHOKj6g8686ofZY9ZcknDxjJao%2FbBi7nVEbCkEwvULhcasEEud2zol6RH64UP3ZpCLUUfxNPx4n4%2FL4zw%3D%3D\" rel=\"noopener noreferrer\">\u8fd9\u4e9b\u670b\u53cb\u8d62\u9ebb\u4e86\uff01<\/a> <\/p>\n<p><a target=\"_blank\" href=\"https:\/\/link.segmentfault.com\/?enc=TddYbMgB5RTWBynlaw5nJA%3D%3D.tYRNKaRTPbhKOtWv4qfSJff2YdEwyurfkqMly3IaPCcXSJk1WNX1QYKTZu%2BczkU4ElPgjF0JMBII1vwkK2%2BYkw%3D%3D\" rel=\"noopener noreferrer\">\u8fd9\u662f\u4e00\u4e2a\u4e13\u6ce8\u7a0b\u5e8f\u5458\u5347\u804c\u52a0\u85aa\u306e\u77e5\u8bc6\u661f\u7403<\/a><\/p>\n<h2>\u7b54\u7591\u89e3\u60d1<\/h2>\n<p>\u9700\u8981\u300c\u7b80\u5386\u4f18\u5316\u300d\u3001\u300c\u5c31\u4e1a\u8f85\u5bfc\u300d\u3001\u300c\u804c\u4e1a\u89c4\u5212\u300d\u7684\u670b\u53cb\u53ef\u4ee5\u8054\u7cfb\u6211\u3002<\/p>\n<p>\u52a0\u6211\u5fae\u4fe1\uff1a<strong>wangzhongyang1993<\/strong><\/p>\n<p>\u6211\u7684\u6587\u7ae0\u5747\u9996\u53d1\u5728\u540c\u540d\u516c\u4f17\u53f7\uff1a<a target=\"_blank\" href=\"https:\/\/link.segmentfault.com\/?enc=DQqeI8%2BcZHxziVrRSY1HkA%3D%3D.zd2Qcsh7FnsCcVNtBklPzGsLXKZVTknoJ0wLl%2FAbQh%2FxQIirDo575v%2FaC6anOEa%2BaeBW6%2BKytmjbNgXE9Y7pzQ%3D%3D\" rel=\"noopener noreferrer\">\u738b\u4e2d\u9633Go<\/a>\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8<\/p>\n<p><a href=\"https:\/\/segmentfault.com\/a\/1190000044668913\">https:\/\/segmentfault.com\/a\/1190000044668913<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u91d1\u4e09\u94f6\u56db\u8df3\u69fd\u5b63\uff0c\u4e0d\u77e5\u9053\u4f60\u51c6\u5907\u7684\u600e\u4e48\u6837\u4e86\uff1f \u524d\u6bb5\u65f6\u95f4\u6211\u5206\u4eab\u4e86\u4e24\u7bc7\u6587\u7ae0\uff0c\u7c89\u4e1d\u80a1\u4e1c\u4eec\u7eb7\u7eb7\u8868\u793a\u6709\u7528\uff0c\u6709\u542f\u53d1\uff1a\uff0c\u4e4b\u524d\u6ca1\u770b [&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-10008413","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\/10008413","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=10008413"}],"version-history":[{"count":0,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10008413\/revisions"}],"wp:attachment":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10008413"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10008413"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10008413"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}