{"id":5796,"date":"2024-11-14T09:09:57","date_gmt":"2024-11-14T01:09:57","guid":{"rendered":"https:\/\/fwq.ai\/blog\/5796\/"},"modified":"2024-11-14T09:09:57","modified_gmt":"2024-11-14T01:09:57","slug":"mysql%e6%9f%a5%e8%af%a2%e4%bc%98%e5%8c%96%e5%99%a8%e6%80%8e%e4%b9%88%e7%94%a8","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/5796\/","title":{"rendered":"mysql\u67e5\u8be2\u4f18\u5316\u5668\u600e\u4e48\u7528"},"content":{"rendered":"

\n mysql \u67e5\u8be2\u4f18\u5316\u5668\u662f\u4e00\u4e2a\u7528\u4e8e\u4f18\u5316\u67e5\u8be2\u5e76\u786e\u5b9a\u9ad8\u6548\u6267\u884c\u8ba1\u5212\u7684\u5de5\u5177\u3002\u5b83\u901a\u8fc7\u89e3\u6790\u67e5\u8be2\u3001\u751f\u6210\u6267\u884c\u8ba1\u5212\u3001\u4f30\u8ba1\u6210\u672c\u5e76\u9009\u62e9\u6700\u4f18\u8ba1\u5212\u6765\u5de5\u4f5c\u3002\u53ef\u4ee5\u901a\u8fc7\u521b\u5efa\u7d22\u5f15\u3001\u4f18\u5316\u8868\u7ed3\u6784\u3001\u8c03\u4f18\u67e5\u8be2\u548c\u4f7f\u7528\u63d0\u793a\u6765\u5f71\u54cd\u5176\u884c\u4e3a\u3002\n<\/p><\/blockquote>\n

\"mysql\u67e5\u8be2\u4f18\u5316\u5668\u600e\u4e48\u7528\u63d2\u56fe\"<\/p>\n

\u5982\u4f55\u4f7f\u7528 MySQL \u67e5\u8be2\u4f18\u5316\u5668<\/strong><\/p>\n

MySQL \u67e5\u8be2\u4f18\u5316\u5668\u662f\u4e00\u4e2a\u5185\u7f6e\u5de5\u5177\uff0c\u7528\u4e8e\u5206\u6790\u67e5\u8be2\u5e76\u786e\u5b9a\u6267\u884c\u8ba1\u5212\uff0c\u4ee5\u5c3d\u53ef\u80fd\u9ad8\u6548\u5730\u4ece\u6570\u636e\u5e93\u4e2d\u68c0\u7d22\u6570\u636e\u3002<\/p>\n

\u5982\u4f55\u542f\u7528\u67e5\u8be2\u4f18\u5316\u5668<\/strong><\/p>\n

\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u67e5\u8be2\u4f18\u5316\u5668\u5904\u4e8e\u542f\u7528\u72b6\u6001\u3002\u4f46\u662f\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u624b\u52a8\u542f\u7528\u6216\u7981\u7528\u5b83\uff1a<\/p>\n

SET optimizer_switch='=enabled_or_disabled'<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u67e5\u8be2\u4f18\u5316\u5668\u7684\u5de5\u4f5c\u539f\u7406<\/strong><\/p>\n
\u5f53\u60a8\u8fd0\u884c\u67e5\u8be2\u65f6\uff0c\u67e5\u8be2\u4f18\u5316\u5668\u4f1a\u6267\u884c\u4ee5\u4e0b\u6b65\u9aa4\uff1a<\/p>\n
    \n
  •  \u89e3\u6790\u67e5\u8be2\uff1a<\/strong>\u67e5\u8be2\u4f18\u5316\u5668\u9996\u5148\u4f1a\u89e3\u6790\u67e5\u8be2\uff0c\u786e\u5b9a\u5176\u7ed3\u6784\u548c\u610f\u56fe\u3002<\/li>\n
  •  \u751f\u6210\u6267\u884c\u8ba1\u5212\uff1a<\/strong>\u7136\u540e\uff0c\u5b83\u4f1a\u751f\u6210\u4e00\u4e2a\u6267\u884c\u8ba1\u5212\uff0c\u6982\u8ff0\u4e86\u4ece\u6570\u636e\u5e93\u68c0\u7d22\u6570\u636e\u7684\u6b65\u9aa4\u3002<\/li>\n
  •  \u4f30\u8ba1\u6267\u884c\u8ba1\u5212\u7684\u6210\u672c\uff1a<\/strong>\u67e5\u8be2\u4f18\u5316\u5668\u4f1a\u4f30\u8ba1\u6bcf\u79cd\u6267\u884c\u8ba1\u5212\u7684\u6210\u672c\uff0c\u8be5\u6210\u672c\u57fa\u4e8e\u591a\u79cd\u56e0\u7d20\uff0c\u4f8b\u5982\u8868\u5927\u5c0f\u3001\u7d22\u5f15\u4f7f\u7528\u60c5\u51b5\u548c\u6570\u636e\u5206\u5e03\u3002<\/li>\n
  •  \u9009\u62e9\u6700\u4f73\u6267\u884c\u8ba1\u5212\uff1a<\/strong>\u6700\u540e\uff0c\u5b83\u4f1a\u9009\u62e9\u5177\u6709\u6700\u4f4e\u4f30\u8ba1\u6210\u672c\u7684\u6267\u884c\u8ba1\u5212\u3002<\/li>\n<\/ul>\n
    \u5982\u4f55\u5f71\u54cd\u67e5\u8be2\u4f18\u5316\u5668<\/strong><\/p>\n
    \u60a8\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u5f71\u54cd\u67e5\u8be2\u4f18\u5316\u5668\u7684\u884c\u4e3a\uff1a<\/p>\n
      \n
    •  \u521b\u5efa\u7d22\u5f15\uff1a<\/strong>\u7d22\u5f15\u53ef\u4ee5\u5e2e\u52a9\u67e5\u8be2\u4f18\u5316\u5668\u5feb\u901f\u67e5\u627e\u6570\u636e\u3002<\/li>\n
    •  \u4f7f\u7528\u5408\u9002\u7684\u8868\u7ed3\u6784\uff1a<\/strong>\u8bbe\u8ba1\u8868\u65f6\uff0c\u8bf7\u8003\u8651\u6570\u636e\u5206\u5e03\u548c\u8bbf\u95ee\u6a21\u5f0f\u3002<\/li>\n
    •  \u8c03\u4f18\u67e5\u8be2\uff1a<\/strong>\u53ef\u4ee5\u4f7f\u7528\u63d0\u793a\u6216\u91cd\u5199\u67e5\u8be2\u6765\u5f71\u54cd\u67e5\u8be2\u4f18\u5316\u5668\u751f\u6210\u7684\u6267\u884c\u8ba1\u5212\u3002<\/li>\n
    •  \u76d1\u63a7\u67e5\u8be2\u6027\u80fd\uff1a<\/strong>\u4f7f\u7528\u8bf8\u5982 EXPLAIN \u4e4b\u7c7b\u7684\u5de5\u5177\u6765\u5206\u6790\u67e5\u8be2\u6027\u80fd\u5e76\u8bc6\u522b\u4f18\u5316\u673a\u4f1a\u3002<\/li>\n<\/ul>\n
      \u63d0\u793a<\/strong><\/p>\n
      \u63d0\u793a\u662f\u60a8\u53ef\u4ee5\u6dfb\u52a0\u5230\u67e5\u8be2\u4e2d\u7684\u7279\u6b8a\u6ce8\u91ca\uff0c\u53ef\u4ee5\u5f71\u54cd\u67e5\u8be2\u4f18\u5316\u5668\u7684\u884c\u4e3a\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u89c1\u7684\u63d0\u793a\uff1a<\/p>\n
        \n
      •  USE INDEX\uff1a<\/strong>\u5f3a\u5236\u67e5\u8be2\u4f18\u5316\u5668\u4f7f\u7528\u7279\u5b9a\u7684\u7d22\u5f15\u3002<\/li>\n
      •  FORCE INDEX\uff1a<\/strong>\u5f3a\u5236\u67e5\u8be2\u4f18\u5316\u5668\u4ec5\u4f7f\u7528\u7279\u5b9a\u7684\u7d22\u5f15\u3002<\/li>\n
      •  IGNORE INDEX\uff1a<\/strong>\u5f3a\u5236\u67e5\u8be2\u4f18\u5316\u5668\u5ffd\u7565\u7279\u5b9a\u7684\u7d22\u5f15\u3002<\/li>\n<\/ul>\n
        \u91cd\u5199\u67e5\u8be2<\/strong><\/p>\n
        \u6709\u65f6\uff0c\u60a8\u53ef\u4ee5\u901a\u8fc7\u91cd\u5199\u67e5\u8be2\u6765\u6539\u5584\u6027\u80fd\u3002\u4f8b\u5982\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528\u8fde\u63a5\u800c\u4e0d\u662f\u5b50\u67e5\u8be2\uff0c\u6216\u8005\u4f7f\u7528 LIMIT \u5b50\u53e5\u6765\u9650\u5236\u8fd4\u56de\u7684\u884c\u6570\u3002<\/p>\n
        \u4ee5\u4e0a\u5c31\u662f\u67e5\u8be2\u4f18\u5316\u5668\u600e\u4e48\u7528\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u7f51\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
        mysql \u67e5\u8be2\u4f18\u5316\u5668\u662f\u4e00\u4e2a\u7528\u4e8e\u4f18\u5316\u67e5\u8be2\u5e76\u786e\u5b9a\u9ad8\u6548\u6267\u884c\u8ba1\u5212\u7684\u5de5\u5177\u3002\u5b83\u901a\u8fc7\u89e3\u6790\u67e5\u8be2\u3001\u751f\u6210\u6267\u884c\u8ba1\u5212\u3001\u4f30\u8ba1\u6210\u672c\u5e76\u9009\u62e9\u6700\u4f18\u8ba1\u5212\u6765\u5de5\u4f5c\u3002\u53ef\u4ee5\u901a\u8fc7\u521b\u5efa\u7d22\u5f15\u3001\u4f18\u5316\u8868\u7ed3\u6784\u3001\u8c03\u4f18\u67e5\u8be2\u548c\u4f7f\u7528\u63d0\u793a\u6765\u5f71\u54cd\u5176\u884c\u4e3a\u3002 \u5982\u4f55\u4f7f\u7528 MySQL \u67e5\u8be2\u4f18\u5316\u5668 MySQL \u67e5\u8be2\u4f18\u5316\u5668\u662f\u4e00\u4e2a\u5185\u7f6e\u5de5\u5177\uff0c\u7528\u4e8e\u5206\u6790\u67e5\u8be2\u5e76\u786e\u5b9a\u6267\u884c\u8ba1\u5212\uff0c\u4ee5\u5c3d\u53ef\u80fd\u9ad8\u6548\u5730\u4ece\u6570\u636e\u5e93\u4e2d\u68c0\u7d22\u6570\u636e\u3002 \u5982\u4f55\u542f\u7528\u67e5\u8be2\u4f18\u5316\u5668 \u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u67e5\u8be2\u4f18\u5316\u5668\u5904\u4e8e\u542f\u7528\u72b6\u6001\u3002\u4f46\u662f\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u624b\u52a8\u542f\u7528\u6216\u7981\u7528\u5b83\uff1a SET optimizer_switch=’=enabled_or_disabled’ \u767b\u5f55\u540e\u590d\u5236 \u67e5\u8be2\u4f18\u5316\u5668\u7684\u5de5\u4f5c\u539f\u7406 \u5f53\u60a8\u8fd0\u884c\u67e5\u8be2\u65f6\uff0c\u67e5\u8be2\u4f18\u5316\u5668\u4f1a\u6267\u884c\u4ee5\u4e0b\u6b65\u9aa4\uff1a \u89e3\u6790\u67e5\u8be2\uff1a\u67e5\u8be2\u4f18\u5316\u5668\u9996\u5148\u4f1a\u89e3\u6790\u67e5\u8be2\uff0c\u786e\u5b9a\u5176\u7ed3\u6784\u548c\u610f\u56fe\u3002 \u751f\u6210\u6267\u884c\u8ba1\u5212\uff1a\u7136\u540e\uff0c\u5b83\u4f1a\u751f\u6210\u4e00\u4e2a\u6267\u884c\u8ba1\u5212\uff0c\u6982\u8ff0\u4e86\u4ece\u6570\u636e\u5e93\u68c0\u7d22\u6570\u636e\u7684\u6b65\u9aa4\u3002 \u4f30\u8ba1\u6267\u884c\u8ba1\u5212\u7684\u6210\u672c\uff1a\u67e5\u8be2\u4f18\u5316\u5668\u4f1a\u4f30\u8ba1\u6bcf\u79cd\u6267\u884c\u8ba1\u5212\u7684\u6210\u672c\uff0c\u8be5\u6210\u672c\u57fa\u4e8e\u591a\u79cd\u56e0\u7d20\uff0c\u4f8b\u5982\u8868\u5927\u5c0f\u3001\u7d22\u5f15\u4f7f\u7528\u60c5\u51b5\u548c\u6570\u636e\u5206\u5e03\u3002 \u9009\u62e9\u6700\u4f73\u6267\u884c\u8ba1\u5212\uff1a\u6700\u540e\uff0c\u5b83\u4f1a\u9009\u62e9\u5177\u6709\u6700\u4f4e\u4f30\u8ba1\u6210\u672c\u7684\u6267\u884c\u8ba1\u5212\u3002 \u5982\u4f55\u5f71\u54cd\u67e5\u8be2\u4f18\u5316\u5668 \u60a8\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u5f71\u54cd\u67e5\u8be2\u4f18\u5316\u5668\u7684\u884c\u4e3a\uff1a \u521b\u5efa\u7d22\u5f15\uff1a\u7d22\u5f15\u53ef\u4ee5\u5e2e\u52a9\u67e5\u8be2\u4f18\u5316\u5668\u5feb\u901f\u67e5\u627e\u6570\u636e\u3002 \u4f7f\u7528\u5408\u9002\u7684\u8868\u7ed3\u6784\uff1a\u8bbe\u8ba1\u8868\u65f6\uff0c\u8bf7\u8003\u8651\u6570\u636e\u5206\u5e03\u548c\u8bbf\u95ee\u6a21\u5f0f\u3002 \u8c03\u4f18\u67e5\u8be2\uff1a\u53ef\u4ee5\u4f7f\u7528\u63d0\u793a\u6216\u91cd\u5199\u67e5\u8be2\u6765\u5f71\u54cd\u67e5\u8be2\u4f18\u5316\u5668\u751f\u6210\u7684\u6267\u884c\u8ba1\u5212\u3002 \u76d1\u63a7\u67e5\u8be2\u6027\u80fd\uff1a\u4f7f\u7528\u8bf8\u5982 EXPLAIN \u4e4b\u7c7b\u7684\u5de5\u5177\u6765\u5206\u6790\u67e5\u8be2\u6027\u80fd\u5e76\u8bc6\u522b\u4f18\u5316\u673a\u4f1a\u3002 \u63d0\u793a \u63d0\u793a\u662f\u60a8\u53ef\u4ee5\u6dfb\u52a0\u5230\u67e5\u8be2\u4e2d\u7684\u7279\u6b8a\u6ce8\u91ca\uff0c\u53ef\u4ee5\u5f71\u54cd\u67e5\u8be2\u4f18\u5316\u5668\u7684\u884c\u4e3a\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u89c1\u7684\u63d0\u793a\uff1a USE INDEX\uff1a\u5f3a\u5236\u67e5\u8be2\u4f18\u5316\u5668\u4f7f\u7528\u7279\u5b9a\u7684\u7d22\u5f15\u3002 FORCE INDEX\uff1a\u5f3a\u5236\u67e5\u8be2\u4f18\u5316\u5668\u4ec5\u4f7f\u7528\u7279\u5b9a\u7684\u7d22\u5f15\u3002 IGNORE INDEX\uff1a\u5f3a\u5236\u67e5\u8be2\u4f18\u5316\u5668\u5ffd\u7565\u7279\u5b9a\u7684\u7d22\u5f15\u3002 \u91cd\u5199\u67e5\u8be2 \u6709\u65f6\uff0c\u60a8\u53ef\u4ee5\u901a\u8fc7\u91cd\u5199\u67e5\u8be2\u6765\u6539\u5584\u6027\u80fd\u3002\u4f8b\u5982\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528\u8fde\u63a5\u800c\u4e0d\u662f\u5b50\u67e5\u8be2\uff0c\u6216\u8005\u4f7f\u7528 LIMIT \u5b50\u53e5\u6765\u9650\u5236\u8fd4\u56de\u7684\u884c\u6570\u3002 \u4ee5\u4e0a\u5c31\u662f\u67e5\u8be2\u4f18\u5316\u5668\u600e\u4e48\u7528\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u7f51\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-5796","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5796","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=5796"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5796\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=5796"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=5796"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=5796"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}