{"id":477146,"date":"2023-08-09T09:08:09","date_gmt":"2023-08-09T09:08:09","guid":{"rendered":""},"modified":"2023-09-05T11:14:07","modified_gmt":"2023-09-05T11:14:07","slug":"execution-plan-sql","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/cn\/wiki\/execution-plan-sql\/","title":{"rendered":"\u6267\u884c\u8ba1\u5212\uff08SQL\uff09"},"content":{"rendered":"

SQL\uff08\u7ed3\u6784\u5316\u67e5\u8be2\u8bed\u8a00\uff09\u4e0a\u4e0b\u6587\u4e2d\u7684\u6267\u884c\u8ba1\u5212\u662f\u4f18\u5316\u6570\u636e\u5e93\u67e5\u8be2\u6027\u80fd\u7684\u91cd\u8981\u65b9\u9762\u3002\u5b83\u662f\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf (DBMS) \u9ad8\u6548\u6267\u884c\u7279\u5b9a SQL \u67e5\u8be2\u6240\u9075\u5faa\u7684\u8be6\u7ec6\u8def\u7ebf\u56fe\u3002\u6267\u884c\u8ba1\u5212\u6982\u8ff0\u4e86 DBMS \u5c06\u7528\u4e8e\u68c0\u7d22\u3001\u8054\u63a5\u3001\u8fc7\u6ee4\u548c\u5904\u7406\u6570\u636e\u4ee5\u6ee1\u8db3\u67e5\u8be2\u8981\u6c42\u7684\u6b65\u9aa4\u548c\u64cd\u4f5c\u3002\u4e86\u89e3\u6267\u884c\u8ba1\u5212\u5bf9\u4e8e\u6570\u636e\u5e93\u7ba1\u7406\u5458\u548c\u5f00\u53d1\u4eba\u5458\u8bc6\u522b\u548c\u89e3\u51b3\u5e94\u7528\u7a0b\u5e8f\u4e2d\u7684\u6027\u80fd\u74f6\u9888\u81f3\u5173\u91cd\u8981\u3002<\/p>\n

\u6267\u884c\u8ba1\u5212\uff08SQL\uff09\u7684\u8d77\u6e90\u5386\u53f2\u548c\u9996\u6b21\u63d0\u53ca<\/h2>\n

\u6267\u884c\u8ba1\u5212\u7684\u6982\u5ff5\u662f\u5728 20 \u4e16\u7eaa 70 \u5e74\u4ee3\u672b\u548c 80 \u5e74\u4ee3\u521d\u4f5c\u4e3a\u5173\u7cfb\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf (RDBMS) \u7684\u57fa\u672c\u7ec4\u6210\u90e8\u5206\u51fa\u73b0\u7684\u3002\u5b83\u7684\u53d1\u5c55\u662f\u4e3a\u4e86\u5e94\u5bf9\u65e5\u76ca\u590d\u6742\u7684\u6570\u636e\u5e93\u67e5\u8be2\u4ee5\u53ca\u4f18\u5316\u5176\u6267\u884c\u4ee5\u83b7\u5f97\u66f4\u597d\u6027\u80fd\u7684\u9700\u6c42\u3002<\/p>\n

\u5bf9\u6267\u884c\u8ba1\u5212\u6700\u65e9\u7684\u63d0\u53ca\u4e4b\u4e00\u53ef\u4ee5\u8ffd\u6eaf\u5230 20 \u4e16\u7eaa 70 \u5e74\u4ee3\u521d IBM \u7814\u7a76\u4e2d\u5fc3 System R \u9879\u76ee\u7684\u5f00\u53d1\u3002 System R \u662f\u4e00\u79cd\u5f00\u521b\u6027\u7684 RDBMS\uff0c\u4e3a\u8bb8\u591a\u73b0\u4ee3\u57fa\u4e8e SQL \u7684\u6570\u636e\u5e93\u7cfb\u7edf\u5960\u5b9a\u4e86\u57fa\u7840\u3002 IBM \u7684\u7814\u7a76\u4eba\u5458\u8ba4\u8bc6\u5230\u9ad8\u6548\u6267\u884c\u67e5\u8be2\u7684\u91cd\u8981\u6027\uff0c\u5e76\u8bbe\u8ba1\u4e86\u81ea\u52a8\u751f\u6210\u6267\u884c\u8ba1\u5212\u7684\u6280\u672f\u3002<\/p>\n

\u6709\u5173\u6267\u884c\u8ba1\u5212 (SQL) \u7684\u8be6\u7ec6\u4fe1\u606f<\/h2>\n

\u6267\u884c\u8ba1\u5212\u7684\u4e3b\u8981\u76ee\u7684\u662f\u4e3a\u6570\u636e\u5e93\u5f15\u64ce\u63d0\u4f9b\u6709\u5173\u5982\u4f55\u8bbf\u95ee\u548c\u64cd\u4f5c\u6570\u636e\u4ee5\u4ea7\u751f\u6240\u9700\u67e5\u8be2\u7ed3\u679c\u7684\u5206\u6b65\u6307\u5357\u3002\u6570\u636e\u5e93\u5f15\u64ce\u91c7\u7528\u5404\u79cd\u7b97\u6cd5\u3001\u8bbf\u95ee\u65b9\u6cd5\u548c\u4f18\u5316\u7b56\u7565\u6765\u6709\u6548\u5730\u5b8c\u6210\u6b64\u4efb\u52a1\u3002<\/p>\n

\u5f53\u67e5\u8be2\u63d0\u4ea4\u5230 DBMS \u65f6\uff0c\u5b83\u4f1a\u7ecf\u5386\u591a\u4e2a\u6b65\u9aa4\u8fc7\u7a0b\uff0c\u7136\u540e\u624d\u80fd\u8fdb\u884c\u5b9e\u9645\u7684\u6570\u636e\u68c0\u7d22\u548c\u5904\u7406\u3002\u4ee5\u4e0b\u662f\u8be5\u8fc7\u7a0b\u7684\u6982\u8ff0\uff1a<\/p>\n

    \n
  1. \n

    \u89e3\u6790\uff1a<\/strong> DBMS \u9996\u5148\u89e3\u6790 SQL \u67e5\u8be2\u4ee5\u786e\u4fdd\u5176\u8bed\u6cd5\u548c\u8bed\u4e49\u7684\u6b63\u786e\u6027\u3002\u5b83\u68c0\u67e5\u6b63\u786e\u7684\u8868\u540d\u548c\u5217\u540d\u3001\u6b63\u786e\u7684\u8bed\u6cd5\u4ee5\u53ca\u6709\u6548\u7684\u5f15\u7528\u3002<\/p>\n<\/li>\n

  2. \n

    \u4f18\u5316\uff1a<\/strong> \u4e00\u65e6\u67e5\u8be2\u7ecf\u8fc7\u9a8c\u8bc1\uff0c\u67e5\u8be2\u4f18\u5316\u5668\u5c31\u4f1a\u53d1\u6325\u4f5c\u7528\u3002\u4f18\u5316\u5668\u63a2\u7d22\u4e0d\u540c\u7684\u6267\u884c\u8ba1\u5212\u5e76\u9009\u62e9\u6700\u6709\u6548\u7684\u4e00\u4e2a\u3002\u5b83\u4f1a\u8003\u8651\u53ef\u7528\u7d22\u5f15\u3001\u7edf\u8ba1\u6570\u636e\u548c\u6570\u636e\u5e93\u5f53\u524d\u72b6\u6001\u7b49\u56e0\u7d20\u6765\u505a\u51fa\u660e\u667a\u7684\u51b3\u7b56\u3002<\/p>\n<\/li>\n

  3. \n

    \u6267\u884c\u8ba1\u5212\u751f\u6210\uff1a<\/strong> \u4f18\u5316\u540e\uff0c\u751f\u6210\u9009\u5b9a\u7684\u6267\u884c\u8ba1\u5212\u3002\u6267\u884c\u8ba1\u5212\u901a\u5e38\u8868\u793a\u4e3a\u6811\u72b6\u7ed3\u6784\uff0c\u6bcf\u4e2a\u8282\u70b9\u4ee3\u8868\u4e00\u4e2a\u64cd\u4f5c\uff08\u4f8b\u5982\uff0c\u626b\u63cf\u3001\u8fde\u63a5\u3001\u6392\u5e8f\uff09\uff0c\u8282\u70b9\u4e4b\u95f4\u7684\u8fde\u63a5\u6307\u793a\u6570\u636e\u6d41\u3002<\/p>\n<\/li>\n

  4. \n

    \u6267\u884c\uff1a<\/strong> \u6709\u4e86\u6267\u884c\u8ba1\u5212\uff0cDBMS \u5c06\u6309\u7167\u8ba1\u5212\u4e2d\u6982\u8ff0\u7684\u6b65\u9aa4\u6267\u884c\u67e5\u8be2\u3002\u5728\u6267\u884c\u8fc7\u7a0b\u4e2d\uff0c\u5f15\u64ce\u53ef\u80fd\u4f1a\u5229\u7528\u7d22\u5f15\u67e5\u627e\u3001\u7d22\u5f15\u626b\u63cf\u3001\u6563\u5217\u8fde\u63a5\u3001\u5d4c\u5957\u5faa\u73af\u8fde\u63a5\u548c\u6392\u5e8f\u7b49\u5404\u79cd\u6280\u672f\u6765\u83b7\u53d6\u548c\u5904\u7406\u6570\u636e\u3002<\/p>\n<\/li>\n

  5. \n

    \u7ed3\u679c\u68c0\u7d22\uff1a<\/strong> \u6700\u540e\uff0c\u67e5\u8be2\u5f15\u64ce\u68c0\u7d22\u67e5\u8be2\u7ed3\u679c\u5e76\u5c06\u5176\u5448\u73b0\u7ed9\u7528\u6237\u6216\u5e94\u7528\u7a0b\u5e8f\u3002<\/p>\n<\/li>\n<\/ol>\n

    \u6267\u884c\u8ba1\u5212 (SQL) \u7684\u5185\u90e8\u7ed3\u6784 \u2013 \u6267\u884c\u8ba1\u5212 (SQL) \u7684\u5de5\u4f5c\u539f\u7406<\/h2>\n

    \u6267\u884c\u8ba1\u5212\u7684\u5185\u90e8\u7ed3\u6784\u53d6\u51b3\u4e8e\u5e95\u5c42\u6570\u636e\u5e93\u7cfb\u7edf\u53ca\u5176\u67e5\u8be2\u4f18\u5316\u5668\u3002\u7136\u800c\uff0c\u5927\u591a\u6570 DBMS \u7684\u57fa\u672c\u539f\u5219\u4ecd\u7136\u662f\u4e00\u81f4\u7684\u3002<\/p>\n

    \u6267\u884c\u8ba1\u5212\u901a\u5e38\u8868\u793a\u4e3a\u6811\u72b6\u7ed3\u6784\uff0c\u5176\u4e2d\u6bcf\u4e2a\u8282\u70b9\u5bf9\u5e94\u4e00\u4e2a\u7279\u5b9a\u64cd\u4f5c\uff0c\u8fb9\u4ee3\u8868\u64cd\u4f5c\u4e4b\u95f4\u7684\u6570\u636e\u6d41\u3002\u8282\u70b9\u53ef\u4ee5\u5206\u4e3a\u591a\u79cd\u7c7b\u578b\uff0c\u5305\u62ec\uff1a<\/p>\n

      \n
    1. \n

      \u8868\u626b\u63cf\uff1a<\/strong> \u8be5\u8282\u70b9\u8868\u793a\u5168\u8868\u626b\u63cf\uff0c\u5176\u4e2d DBMS \u8bfb\u53d6\u8868\u4e2d\u7684\u6240\u6709\u884c\u4ee5\u67e5\u627e\u6240\u9700\u7684\u6570\u636e\u3002<\/p>\n<\/li>\n

    2. \n

      \u7d22\u5f15\u626b\u63cf\/\u67e5\u627e\uff1a<\/strong> \u8fd9\u4e9b\u8282\u70b9\u5bf9\u5e94\u4e8e\u4f7f\u7528\u7d22\u5f15\u8bbf\u95ee\u6570\u636e\u3002\u7d22\u5f15\u626b\u63cf\u6d89\u53ca\u8bfb\u53d6\u7d22\u5f15\u6761\u76ee\uff0c\u7136\u540e\u4ece\u8868\u4e2d\u83b7\u53d6\u76f8\u5e94\u7684\u884c\uff0c\u800c\u7d22\u5f15\u67e5\u627e\u5219\u4f7f\u7528\u7d22\u5f15\u76f4\u63a5\u5b9a\u4f4d\u884c\u3002<\/p>\n<\/li>\n

    3. \n

      \u7b5b\u9009\uff1a<\/strong> \u8fc7\u6ee4\u5668\u8282\u70b9\u5e94\u7528\u8c13\u8bcd\u6765\u6839\u636e\u6307\u5b9a\u6761\u4ef6\u8fc7\u6ee4\u884c\u3002<\/p>\n<\/li>\n

    4. \n

      \u79cd\u7c7b\uff1a<\/strong> \u6392\u5e8f\u8282\u70b9\u8d1f\u8d23\u6839\u636e\u6307\u5b9a\u7684\u5217\u5bf9\u6570\u636e\u8fdb\u884c\u6392\u5e8f\u3002<\/p>\n<\/li>\n

    5. \n

      \u52a0\u5165\uff1a<\/strong> \u8fde\u63a5\u8282\u70b9\u6839\u636e\u8fde\u63a5\u6761\u4ef6\u5904\u7406\u7ec4\u5408\u591a\u4e2a\u8868\u4e2d\u7684\u6570\u636e\u3002<\/p>\n<\/li>\n<\/ol>\n

      \u6570\u636e\u5e93\u4f18\u5316\u5668\u8bc4\u4f30\u5404\u79cd\u6267\u884c\u8ba1\u5212\u5e76\u4e3a\u6bcf\u4e2a\u8ba1\u5212\u5206\u914d\u6210\u672c\u3002\u9009\u62e9\u6210\u672c\u6700\u4f4e\u7684\u8ba1\u5212\u4f5c\u4e3a\u6700\u4f73\u8ba1\u5212\u5e76\u6267\u884c\u8be5\u8ba1\u5212\u6765\u5b8c\u6210\u67e5\u8be2\u3002<\/p>\n

      \u6267\u884c\u8ba1\u5212\uff08SQL\uff09\u7684\u5173\u952e\u7279\u5f81\u5206\u6790<\/h2>\n

      SQL\u6267\u884c\u8ba1\u5212\u7684\u4e3b\u8981\u7279\u70b9\u662f\uff1a<\/p>\n

        \n
      1. \n

        \u4f18\u5316\uff1a<\/strong> \u6267\u884c\u8ba1\u5212\u5229\u7528\u67e5\u8be2\u4f18\u5316\u5668\uff0c\u5b83\u63a2\u7d22\u591a\u79cd\u7b56\u7565\u6765\u786e\u5b9a\u6267\u884c\u67e5\u8be2\u7684\u6700\u6709\u6548\u65b9\u6cd5\u3002\u5b83\u4f1a\u8003\u8651\u53ef\u7528\u7d22\u5f15\u3001\u7edf\u8ba1\u6570\u636e\u548c\u8868\u5927\u5c0f\u7b49\u56e0\u7d20\u6765\u4f30\u8ba1\u6bcf\u4e2a\u8ba1\u5212\u7684\u6210\u672c\u3002<\/p>\n<\/li>\n

      2. \n

        \u7075\u6d3b\u6027\uff1a<\/strong> \u6839\u636e\u6570\u636e\u5e93\u7cfb\u7edf\u7684\u4e0d\u540c\uff0c\u6267\u884c\u8ba1\u5212\u53ef\u80fd\u4f1a\u53d7\u5230\u5f00\u53d1\u4eba\u5458\u7684\u5f71\u54cd\u751a\u81f3\u5f3a\u5236\u6267\u884c\u3002\u8fd9\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528 SQL \u67e5\u8be2\u4e2d\u5d4c\u5165\u7684\u63d0\u793a\u6216\u6307\u4ee4\u6765\u5b9e\u73b0\u3002<\/p>\n<\/li>\n

      3. \n

        \u52a8\u6001\u4f18\u5316\uff1a<\/strong> \u4e00\u4e9b\u73b0\u4ee3 DBMS \u652f\u6301\u52a8\u6001\u4f18\u5316\uff0c\u5176\u4e2d\u6267\u884c\u8ba1\u5212\u53ef\u4ee5\u5728\u67e5\u8be2\u6267\u884c\u671f\u95f4\u6839\u636e\u5b9e\u9645\u6570\u636e\u5206\u5e03\u548c\u8d44\u6e90\u53ef\u7528\u6027\u8fdb\u884c\u66f4\u6539\u3002<\/p>\n<\/li>\n

      4. \n

        \u57fa\u4e8e\u7edf\u8ba1\u7684\u51b3\u7b56\uff1a<\/strong> \u67e5\u8be2\u4f18\u5316\u5668\u4e25\u91cd\u4f9d\u8d56\u6709\u5173\u6570\u636e\u5e93\u4e2d\u8868\u548c\u7d22\u5f15\u7684\u7edf\u8ba1\u4fe1\u606f\u6765\u505a\u51fa\u6709\u5173\u6700\u6709\u6548\u6267\u884c\u8ba1\u5212\u7684\u660e\u667a\u51b3\u7b56\u3002<\/p>\n<\/li>\n<\/ol>\n

        \u6267\u884c\u8ba1\u5212 (SQL) \u7684\u7c7b\u578b<\/h2>\n

        \u67e5\u8be2\u4f18\u5316\u5668\u53ef\u4ee5\u6839\u636e\u67e5\u8be2\u590d\u6742\u6027\u3001\u6570\u636e\u5206\u5e03\u548c\u53ef\u7528\u8d44\u6e90\u8003\u8651\u591a\u79cd\u7c7b\u578b\u7684\u6267\u884c\u8ba1\u5212\u3002\u6700\u5e38\u89c1\u7684\u7c7b\u578b\u5305\u62ec\uff1a<\/p>\n

          \n
        1. \n

          \u8868\u626b\u63cf\u8ba1\u5212\uff1a<\/strong> \u8be5\u8ba1\u5212\u6d89\u53ca\u626b\u63cf\u6574\u4e2a\u8868\u4ee5\u68c0\u7d22\u5fc5\u8981\u7684\u6570\u636e\u3002\u5b83\u9002\u7528\u4e8e\u5c0f\u578b\u8868\u6216\u9700\u8981\u8bbf\u95ee\u8868\u7684\u5f88\u5927\u4e00\u90e8\u5206\u65f6\u3002<\/p>\n<\/li>\n

        2. \n

          \u7d22\u5f15\u626b\u63cf\u8ba1\u5212\uff1a<\/strong> \u5728\u6b64\u8ba1\u5212\u4e2d\uff0c\u67e5\u8be2\u4f18\u5316\u5668\u5229\u7528\u7d22\u5f15\u6765\u6709\u6548\u5730\u5b9a\u4f4d\u6240\u9700\u7684\u884c\u3002\u5f53\u7d22\u5f15\u5177\u6709\u9ad8\u5ea6\u9009\u62e9\u6027\u5e76\u4e14\u53ea\u9700\u8981\u8bbf\u95ee\u4e00\u5c0f\u90e8\u5206\u884c\u65f6\uff0c\u5b83\u6548\u679c\u5f88\u597d\u3002<\/p>\n<\/li>\n

        3. \n

          \u5d4c\u5957\u5faa\u73af\u8fde\u63a5\u8ba1\u5212\uff1a<\/strong> \u8be5\u8ba1\u5212\u6d89\u53ca\u5faa\u73af\u904d\u5386\u4e00\u4e2a\u8868\u5e76\u6839\u636e\u8fde\u63a5\u6761\u4ef6\u63a2\u6d4b\u53e6\u4e00\u8868\u4ee5\u67e5\u627e\u5339\u914d\u7684\u884c\u3002\u5f53\u5176\u4e2d\u4e00\u4e2a\u8868\u5f88\u5c0f\u5e76\u4e14\u5728\u8fde\u63a5\u5217\u4e0a\u6709\u7d22\u5f15\u65f6\uff0c\u5b83\u662f\u6709\u6548\u7684\u3002<\/p>\n<\/li>\n

        4. \n

          \u54c8\u5e0c\u8fde\u63a5\u8ba1\u5212\uff1a<\/strong> \u54c8\u5e0c\u8054\u63a5\u7528\u4e8e\u8f83\u5927\u7684\u8868\uff0c\u6d89\u53ca\u4e3a\u5176\u4e2d\u4e00\u4e2a\u8f93\u5165\u8868\u6784\u5efa\u54c8\u5e0c\u8868\uff0c\u7136\u540e\u4f7f\u7528\u53e6\u4e00\u4e2a\u8868\u63a2\u6d4b\u5b83\u3002\u5b83\u5bf9\u4e8e\u5927\u89c4\u6a21\u8fde\u63a5\u975e\u5e38\u6709\u6548\u3002<\/p>\n<\/li>\n

        5. \n

          \u5408\u5e76\u52a0\u5165\u8ba1\u5212\uff1a<\/strong> \u5f53\u4e24\u4e2a\u8f93\u5165\u8868\u90fd\u5728\u8fde\u63a5\u5217\u4e0a\u6392\u5e8f\u65f6\uff0c\u5408\u5e76\u8fde\u63a5\u6548\u679c\u5f88\u597d\u3002\u5b83\u6709\u6548\u5730\u5408\u5e76\u6392\u5e8f\u7684\u6570\u636e\u4ee5\u6267\u884c\u8fde\u63a5\u3002<\/p>\n<\/li>\n

        6. \n

          \u6392\u5e8f\u8ba1\u5212\uff1a<\/strong> \u8be5\u8ba1\u5212\u6839\u636e\u6307\u5b9a\u7684\u5217\u5bf9\u6570\u636e\u8fdb\u884c\u6392\u5e8f\u3002\u5b83\u53ef\u7528\u4e8e ORDER BY \u67e5\u8be2\u6216\u4f18\u5316\u67d0\u4e9b\u8fde\u63a5\u3002<\/p>\n<\/li>\n<\/ol>\n

          \u9009\u62e9\u7684\u6267\u884c\u8ba1\u5212\u7c7b\u578b\u53d6\u51b3\u4e8e\u591a\u79cd\u56e0\u7d20\uff0c\u5305\u62ec\u67e5\u8be2\u7ed3\u6784\u3001\u53ef\u7528\u7d22\u5f15\u4ee5\u53ca\u6d89\u53ca\u7684\u8868\u7684\u5927\u5c0f\u3002<\/p>\n

          \u6267\u884c\u8ba1\u5212\uff08SQL\uff09\u7684\u4f7f\u7528\u65b9\u6cd5\u3001\u4f7f\u7528\u4e2d\u51fa\u73b0\u7684\u95ee\u9898\u53ca\u89e3\u51b3\u65b9\u6cd5<\/h2>\n

          \u4f7f\u7528\u6267\u884c\u8ba1\u5212 (SQL) \u7684\u65b9\u6cd5<\/h3>\n
            \n
          1. \n

            \u67e5\u8be2\u4f18\u5316\uff1a<\/strong> \u6267\u884c\u8ba1\u5212\u7684\u4e3b\u8981\u76ee\u7684\u662f\u4f18\u5316\u67e5\u8be2\u6027\u80fd\u3002\u901a\u8fc7\u4e86\u89e3\u6267\u884c\u8ba1\u5212\uff0c\u5f00\u53d1\u4eba\u5458\u548c\u6570\u636e\u5e93\u7ba1\u7406\u5458\u53ef\u4ee5\u8bc6\u522b\u4f4e\u6548\u7684\u67e5\u8be2\u5e76\u91cd\u7ec4\u5b83\u4eec\u4ee5\u7f29\u77ed\u6267\u884c\u65f6\u95f4\u3002<\/p>\n<\/li>\n

          2. \n

            \u6027\u80fd\u6545\u969c\u6392\u9664\uff1a<\/strong> \u5f53\u67e5\u8be2\u672a\u6309\u9884\u671f\u6267\u884c\u65f6\uff0c\u68c0\u67e5\u5176\u6267\u884c\u8ba1\u5212\u53ef\u4ee5\u63ed\u793a\u6f5c\u5728\u7684\u74f6\u9888\u3002\u5b83\u5141\u8bb8\u67e5\u660e\u7d22\u5f15\u7f3a\u5931\u3001\u8fde\u63a5\u7b56\u7565\u4e0d\u5f53\u6216\u8fc7\u5ea6\u6392\u5e8f\u7b49\u95ee\u9898\u3002<\/p>\n<\/li>\n

          3. \n

            \u7d22\u5f15\u8bbe\u8ba1\uff1a<\/strong> \u5206\u6790\u6267\u884c\u8ba1\u5212\u6709\u52a9\u4e8e\u505a\u51fa\u6709\u5173\u521b\u5efa\u6216\u4fee\u6539\u7d22\u5f15\u7684\u660e\u667a\u51b3\u7b56\uff0c\u4ee5\u66f4\u597d\u5730\u652f\u6301\u67e5\u8be2\u6267\u884c\u3002<\/p>\n<\/li>\n<\/ol>\n

            \u6267\u884c\u8ba1\u5212\uff08SQL\uff09\u4f7f\u7528\u76f8\u5173\u95ee\u9898\u53ca\u89e3\u51b3\u65b9\u6848<\/h3>\n
              \n
            1. \n

              \u4e22\u5931\u6216\u9648\u65e7\u7684\u7edf\u8ba1\u6570\u636e\uff1a<\/strong> \u8fc7\u65f6\u6216\u4e22\u5931\u7684\u7edf\u8ba1\u4fe1\u606f\u53ef\u80fd\u4f1a\u8bef\u5bfc\u67e5\u8be2\u4f18\u5316\u5668\uff0c\u5bfc\u81f4\u6267\u884c\u8ba1\u5212\u4e0d\u7406\u60f3\u3002\u5b9a\u671f\u66f4\u65b0\u7edf\u8ba1\u4fe1\u606f\u6709\u52a9\u4e8e\u4fdd\u6301\u51c6\u786e\u7684\u57fa\u6570\u4f30\u8ba1\uff0c\u4ece\u800c\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\u3002<\/p>\n<\/li>\n

            2. \n

              \u4f4e\u6548\u7684\u52a0\u5165\u7b56\u7565\uff1a<\/strong> \u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u67e5\u8be2\u4f18\u5316\u5668\u53ef\u80fd\u4f1a\u9009\u62e9\u4e0d\u5408\u9002\u7684\u8fde\u63a5\u7b56\u7565\uff0c\u4ece\u800c\u5bfc\u81f4\u67e5\u8be2\u901f\u5ea6\u53d8\u6162\u3002\u4f7f\u7528\u67e5\u8be2\u63d0\u793a\u6216\u91cd\u6784\u67e5\u8be2\u53ef\u4ee5\u6307\u5bfc\u4f18\u5316\u5668\u5236\u5b9a\u66f4\u597d\u7684\u8ba1\u5212\u3002<\/p>\n<\/li>\n

            3. \n

              \u6307\u6570\u9009\u62e9\uff1a<\/strong> \u67e5\u8be2\u4f18\u5316\u5668\u53ef\u80fd\u5e76\u4e0d\u603b\u662f\u4e3a\u67e5\u8be2\u9009\u62e9\u6700\u5408\u9002\u7684\u7d22\u5f15\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u624b\u52a8\u6307\u5b9a\u7d22\u5f15\u6216\u4f7f\u7528\u7d22\u5f15\u63d0\u793a\u53ef\u80fd\u4f1a\u5f88\u6709\u7528\u3002<\/p>\n<\/li>\n

            4. \n

              \u53c2\u6570\u55c5\u63a2\uff1a<\/strong> \u5728\u67e5\u8be2\u53c2\u6570\u53d8\u5316\u5f88\u5927\u7684\u60c5\u51b5\u4e0b\uff0c\u4e3a\u4e00\u7ec4\u53c2\u6570\u751f\u6210\u7684\u6267\u884c\u8ba1\u5212\u5bf9\u4e8e\u5176\u4ed6\u53c2\u6570\u53ef\u80fd\u4e0d\u662f\u6700\u4f73\u7684\u3002\u8fd9\u4e2a\u95ee\u9898\u79f0\u4e3a\u53c2\u6570\u55c5\u63a2\uff0c\u53ef\u4ee5\u4f7f\u7528\u67e5\u8be2\u53c2\u6570\u5316\u6216\u8ba1\u5212\u7f13\u5b58\u7b49\u6280\u672f\u6765\u89e3\u51b3\u3002<\/p>\n<\/li>\n<\/ol>\n

              \u4e3b\u8981\u7279\u5f81\u4ee5\u53ca\u4e0e\u7c7b\u4f3c\u672f\u8bed\u7684\u5176\u4ed6\u6bd4\u8f83\u4ee5\u8868\u683c\u548c\u5217\u8868\u7684\u5f62\u5f0f<\/h2>\n\n\n\n\n\n\n\n\n\n\n
              \u7279\u5f81<\/th>\n\u6267\u884c\u8ba1\u5212\uff08SQL\uff09<\/th>\n\u67e5\u8be2\u8ba1\u5212<\/th>\n\u6267\u884c\u8ba1\u5212\uff08\u7f16\u7a0b\uff09<\/th>\n<\/tr>\n<\/thead>\n
              \u7c7b\u578b<\/td>\n\u6570\u636e\u5e93\u67e5\u8be2\u6267\u884c<\/td>\n\u6570\u636e\u5e93\u67e5\u8be2\u6267\u884c<\/td>\n\u7a0b\u5e8f\u6267\u884c<\/td>\n<\/tr>\n
              \u76ee\u7684<\/td>\n\u4f18\u5316\u67e5\u8be2\u6027\u80fd<\/td>\n\u4f18\u5316\u67e5\u8be2\u6027\u80fd<\/td>\n\u786e\u5b9a\u7a0b\u5e8f\u6d41\u7a0b<\/td>\n<\/tr>\n
              \u7c92\u5ea6<\/td>\n\u67e5\u8be2\u7ea7\u522b<\/td>\n\u67e5\u8be2\u7ea7\u522b<\/td>\n\u8bed\u53e5\u6216\u4ee3\u7801\u5757\u7ea7\u522b<\/td>\n<\/tr>\n
              \u7528\u6cd5<\/td>\n\u6570\u636e\u5e93\u7ba1\u7406<\/td>\n\u6570\u636e\u5e93\u7ba1\u7406<\/td>\n\u8f6f\u4ef6\u5f00\u53d1<\/td>\n<\/tr>\n
              \u8868\u793a<\/td>\n\u6811\u72b6\u7ed3\u6784<\/td>\n\u6811\u72b6\u7ed3\u6784<\/td>\n\u63a7\u5236\u6d41\u7a0b\u56fe<\/td>\n<\/tr>\n
              \u4fe1\u606f\u53ef\u7528\u6027<\/td>\n\u6570\u636e\u5e93\u7cfb\u7edf\u5143\u6570\u636e<\/td>\n\u6570\u636e\u5e93\u7cfb\u7edf\u5143\u6570\u636e<\/td>\n\u8fd0\u884c\u65f6\u53ef\u7528<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

              \u4e0e\u6267\u884c\u8ba1\u5212 (SQL) \u76f8\u5173\u7684\u672a\u6765\u89c2\u70b9\u548c\u6280\u672f<\/h2>\n

              SQL \u6267\u884c\u8ba1\u5212\u7684\u672a\u6765\u4e0e\u6570\u636e\u5e93\u6280\u672f\u7684\u8fdb\u6b65\u5bc6\u5207\u76f8\u5173\uff0c\u7279\u522b\u662f\u5728\u67e5\u8be2\u4f18\u5316\u548c\u673a\u5668\u5b66\u4e60\u65b9\u9762\u3002\u4e00\u4e9b\u6f5c\u5728\u7684\u672a\u6765\u53d1\u5c55\u5305\u62ec\uff1a<\/p>\n

                \n
              1. \n

                \u57fa\u4e8e\u673a\u5668\u5b66\u4e60\u7684\u4f18\u5316\uff1a<\/strong> \u968f\u7740\u6570\u636e\u548c\u67e5\u8be2\u590d\u6742\u6027\u4e0d\u65ad\u589e\u957f\uff0c\u673a\u5668\u5b66\u4e60\u6280\u672f\u53ef\u80fd\u4f1a\u96c6\u6210\u5230\u67e5\u8be2\u4f18\u5316\u4e2d\u3002\u8fd9\u53ef\u80fd\u4f1a\u5bfc\u81f4\u66f4\u5177\u9002\u5e94\u6027\u548c\u4e0a\u4e0b\u6587\u611f\u77e5\u7684\u6267\u884c\u8ba1\u5212\u3002<\/p>\n<\/li>\n

              2. \n

                \u81ea\u52a8\u7d22\u5f15\uff1a<\/strong> \u672a\u6765\u7684\u6570\u636e\u5e93\u7cfb\u7edf\u53ef\u4ee5\u91c7\u7528\u673a\u5668\u5b66\u4e60\u7b97\u6cd5\u6765\u81ea\u52a8\u8bc6\u522b\u548c\u521b\u5efa\u7d22\u5f15\uff0c\u4ece\u800c\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\u3002<\/p>\n<\/li>\n

              3. \n

                \u5b9e\u65f6\u52a8\u6001\u4f18\u5316\uff1a<\/strong> \u52a8\u6001\u4f18\u5316\u53ef\u80fd\u4f1a\u53d8\u5f97\u66f4\u52a0\u590d\u6742\uff0c\u5141\u8bb8\u6267\u884c\u8ba1\u5212\u6839\u636e\u4e0d\u65ad\u53d8\u5316\u7684\u6570\u636e\u5206\u5e03\u548c\u5de5\u4f5c\u8d1f\u8f7d\u8fdb\u884c\u5b9e\u65f6\u8c03\u6574\u3002<\/p>\n<\/li>\n

              4. \n

                \u57fa\u4e8e\u56fe\u7684\u6267\u884c\u8ba1\u5212\uff1a<\/strong> \u53ef\u4ee5\u63a2\u7d22\u6267\u884c\u8ba1\u5212\u7684\u56fe\u5f62\u8868\u793a\uff0c\u4ece\u800c\u5141\u8bb8\u64cd\u4f5c\u548c\u4f18\u5316\u7b56\u7565\u4e4b\u95f4\u5b58\u5728\u66f4\u590d\u6742\u7684\u5173\u7cfb\u3002<\/p>\n<\/li>\n<\/ol>\n

                \u5982\u4f55\u4f7f\u7528\u4ee3\u7406\u670d\u52a1\u5668\u6216\u5982\u4f55\u5c06\u4ee3\u7406\u670d\u52a1\u5668\u4e0e\u6267\u884c\u8ba1\u5212 (SQL) \u5173\u8054<\/h2>\n

                \u4ee3\u7406\u670d\u52a1\u5668\u53ef\u4ee5\u901a\u8fc7\u5145\u5f53\u5ba2\u6237\u7aef\u548c\u6570\u636e\u5e93\u670d\u52a1\u5668\u4e4b\u95f4\u7684\u4e2d\u4ecb\u6765\u4f18\u5316 SQL \u4e2d\u7684\u6267\u884c\u8ba1\u5212\u3002\u4ed6\u4eec\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u63d0\u4f9b\u5e2e\u52a9\uff1a<\/p>\n

                  \n
                1. \n

                  \u7f13\u5b58\uff1a<\/strong> \u4ee3\u7406\u670d\u52a1\u5668\u53ef\u4ee5\u7f13\u5b58\u9891\u7e41\u6267\u884c\u7684\u67e5\u8be2\u53ca\u5176\u76f8\u5e94\u7684\u6267\u884c\u8ba1\u5212\u3002\u8fd9\u51cf\u5c11\u4e86\u6570\u636e\u5e93\u670d\u52a1\u5668\u4e0a\u7684\u8d1f\u8f7d\u5e76\u7f29\u77ed\u4e86\u540e\u7eed\u76f8\u540c\u67e5\u8be2\u7684\u54cd\u5e94\u65f6\u95f4\u3002<\/p>\n<\/li>\n

                2. \n

                  \u8d1f\u8f7d\u5747\u8861\uff1a<\/strong> \u5728\u5206\u5e03\u5f0f\u6570\u636e\u5e93\u73af\u5883\u4e2d\uff0c\u4ee3\u7406\u670d\u52a1\u5668\u53ef\u4ee5\u6839\u636e\u6267\u884c\u8ba1\u5212\u5206\u6790\u6765\u5e73\u8861\u591a\u4e2a\u6570\u636e\u5e93\u670d\u52a1\u5668\u4e4b\u95f4\u7684\u67e5\u8be2\u8d1f\u8f7d\u3002<\/p>\n<\/li>\n

                3. \n

                  \u538b\u7f29\u548c\u7f29\u5c0f\uff1a<\/strong> \u4ee3\u7406\u670d\u52a1\u5668\u53ef\u4ee5\u5728\u5c06 SQL \u67e5\u8be2\u53d1\u9001\u5230\u6570\u636e\u5e93\u670d\u52a1\u5668\u4e4b\u524d\u5bf9\u5176\u8fdb\u884c\u538b\u7f29\u548c\u7f29\u5c0f\uff0c\u4ece\u800c\u51cf\u5c11\u7f51\u7edc\u5f00\u9500\u5e76\u7f29\u77ed\u67e5\u8be2\u6267\u884c\u65f6\u95f4\u3002<\/p>\n<\/li>\n

                4. \n

                  \u67e5\u8be2\u8def\u7531\uff1a<\/strong> \u4ee3\u7406\u670d\u52a1\u5668\u53ef\u4ee5\u6839\u636e\u6267\u884c\u8ba1\u5212\u5206\u6790\u5c06\u67e5\u8be2\u8def\u7531\u5230\u6700\u5408\u9002\u7684\u6570\u636e\u5e93\u670d\u52a1\u5668\uff0c\u4ece\u800c\u786e\u4fdd\u66f4\u597d\u7684\u67e5\u8be2\u6027\u80fd\u3002<\/p>\n<\/li>\n<\/ol>\n

                  \u76f8\u5173\u94fe\u63a5<\/h2>\n

                  \u6709\u5173\u6570\u636e\u5e93\u7cfb\u7edf\u4e2d\u7684\u6267\u884c\u8ba1\u5212\uff08SQL\uff09\u548c\u67e5\u8be2\u4f18\u5316\u7684\u66f4\u591a\u4fe1\u606f\uff0c\u60a8\u53ef\u4ee5\u53c2\u8003\u4ee5\u4e0b\u8d44\u6e90\uff1a<\/p>\n

                    \n
                  1. \u4e86\u89e3\u6267\u884c\u8ba1\u5212<\/a><\/li>\n
                  2. SQL Server \u6267\u884c\u8ba1\u5212<\/a><\/li>\n
                  3. \u6570\u636e\u5e93\u4f18\u5316\u6280\u672f<\/a><\/li>\n<\/ol>\n

                    \u5bf9\u4e8e\u5bfb\u6c42\u4f18\u5316\u6570\u636e\u5e93\u6027\u80fd\u548c\u589e\u5f3a\u6574\u4f53\u7528\u6237\u4f53\u9a8c\u7684\u5f00\u53d1\u4eba\u5458\u548c\u7ba1\u7406\u5458\u6765\u8bf4\uff0c\u4e86\u89e3 SQL \u4e2d\u590d\u6742\u7684\u6267\u884c\u8ba1\u5212\u81f3\u5173\u91cd\u8981\u3002\u901a\u8fc7\u638c\u63e1\u6267\u884c\u8ba1\u5212\u7684\u5185\u90e8\u5de5\u4f5c\u539f\u7406\uff0c\u4ed6\u4eec\u53ef\u4ee5\u505a\u51fa\u660e\u667a\u7684\u51b3\u7b56\u3001\u5fae\u8c03\u67e5\u8be2\u5e76\u786e\u4fdd\u9ad8\u6548\u7684\u6570\u636e\u68c0\u7d22\uff0c\u4f7f\u5176\u6210\u4e3a\u73b0\u4ee3\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\u4e0d\u53ef\u6216\u7f3a\u7684\u4e00\u90e8\u5206\u3002<\/p>","protected":false},"featured_media":0,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-477146","wiki","type-wiki","status-publish","hentry"],"acf":{"faq_title":"Frequently Asked Questions about Execution Plan (SQL) in Database Management Systems<\/mark>","faq_items":[{"question":"What is an Execution Plan in SQL?","answer":"

                    An execution plan in SQL is a detailed roadmap that the database management system (DBMS) follows to execute a specific SQL query efficiently. It outlines the steps and operations the DBMS will use to retrieve, join, filter, and process data to fulfill the query's requirements.<\/p>"},{"question":"How does an Execution Plan work?","answer":"

                    When a query is submitted to the DBMS, it undergoes a multi-step process before the actual data retrieval and processing can take place. The DBMS first parses the SQL query to ensure its correctness, then the query optimizer comes into play, exploring different execution plans and choosing the most efficient one. The selected plan is then generated and executed, with the DBMS employing various techniques like index scans, joins, and sorting to fetch and process data.<\/p>"},{"question":"What are the key features of an Execution Plan in SQL?","answer":"

                    The key features of an execution plan in SQL include optimization, flexibility, dynamic optimization, and statistics-based decision-making. The optimizer evaluates various execution plans and assigns a cost to each, choosing the plan with the lowest cost for execution.<\/p>"},{"question":"What types of Execution Plans exist?","answer":"

                    Several types of execution plans can be considered by the query optimizer, such as table scan plan, index scan plan, nested loop join plan, hash join plan, merge join plan, and sort plan. The choice of plan depends on factors like query complexity, data distribution, and available resources.<\/p>"},{"question":"How can I use Execution Plans in SQL?","answer":"

                    You can use execution plans in SQL for query optimization, performance troubleshooting, and index design. By understanding the execution plan, you can identify inefficient queries, optimize their structure, and improve overall database performance.<\/p>"},{"question":"What problems can be encountered with Execution Plans, and how can they be solved?","answer":"

                    Common problems with execution plans include missing or stale statistics, inefficient join strategies, and improper index selection. To address these issues, regularly update statistics, use query hints, and consider manual index specification.<\/p>"},{"question":"What are the future perspectives related to Execution Plans in SQL?","answer":"

                    The future of execution plans in SQL is expected to involve machine learning-based optimization, automated indexing, real-time dynamic optimization, and potentially, graph-based representations of execution plans.<\/p>"},{"question":"How can proxy servers be associated with Execution Plans in SQL?","answer":"

                    Proxy servers can optimize the execution plan in SQL by caching queries, load balancing, compressing and minifying queries, and routing queries to the most appropriate database server based on execution plan analysis. This enhances overall query performance and database management efficiency.<\/p>"}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/cn\/wp-json\/wp\/v2\/wiki\/477146","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oneproxy.pro\/cn\/wp-json\/wp\/v2\/wiki"}],"about":[{"href":"https:\/\/oneproxy.pro\/cn\/wp-json\/wp\/v2\/types\/wiki"}],"version-history":[{"count":0,"href":"https:\/\/oneproxy.pro\/cn\/wp-json\/wp\/v2\/wiki\/477146\/revisions"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/cn\/wp-json\/wp\/v2\/media?parent=477146"}],"curies":[{"name":"\u53ef\u6e7f\u6027\u7c89\u5242","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}