{"id":31522,"date":"2023-05-24T11:45:54","date_gmt":"2023-05-24T03:45:54","guid":{"rendered":"https:\/\/docs.pingcode.com\/?p=31522"},"modified":"2023-07-31T00:08:30","modified_gmt":"2023-07-30T16:08:30","slug":"mysql-explain%e4%b8%adrows%e6%98%af%e6%80%8e%e4%b9%88%e8%ae%a1%e7%ae%97%e7%9a%84","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/31522.html","title":{"rendered":"mysql explain\u4e2drows\u662f\u600e\u4e48\u8ba1\u7b97\u7684"},"content":{"rendered":"<blockquote class=\"wp-block-quote\">\n<p>row\u503c\u7684\u542b\u4e49\u662fmysql\u89e3\u91ca\u5668\u3010\u8ba4\u4e3a\u3011\u5e94\u8be5\u67e5\u8be2\u7684\u884c\u6570\uff0c\u6709\u4eba\u7814\u7a76\u8fc7\u6e90\u7801\u53d1\u73b0\u8fd9\u4e2a\u73a9\u610f\u548c\u5b9e\u9645\u67e5\u8be2\u65f6\u7684\u8868\u73b0\u5e76\u6ca1\u6709\u592a\u591a\u5173\u7cfb\u3002\u7b80\u5355\u6765\u8bb2\u5c31\u662f\uff0c\u8fd9\u4e2arows\u503c\u53ea\u662fmysql\u6839\u636e\u7f13\u5b58\u6570\u636e\u7684\u4e00\u4e2a<a href=\"https:\/\/docs.pingcode.com\/agile\/project-management\/estimation\" target=\"_blank\">\u4f30\u7b97<\/a>\u3002<\/p>\n<\/blockquote>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img fetchpriority=\"high\" alt=\"\" class=\"wp-image-31523\" decoding=\"async\" height=\"421\" sizes=\"(max-width: 680px) 100vw, 680px\" src=\"https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2023\/05\/\u6dfb\u52a0\u6807\u9898-10-11.png?x-oss-process=image\/auto-orient,1\/format,webp\" srcset=\"https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2023\/05\/\u6dfb\u52a0\u6807\u9898-10-11.png?x-oss-process=image\/auto-orient,1\/format,webp 680w, https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2023\/05\/\u6dfb\u52a0\u6807\u9898-10-11-300x186.png 300w\" width=\"680\"\/><\/figure>\n<\/div>\n<h2 class=\"wp-block-heading\"><strong>\u4e00\u3001mysql explain\u4e2drows\u662f\u600e\u4e48\u8ba1\u7b97\u7684<\/strong><\/h2>\n<p>row\u503c\u7684\u542b\u4e49\u662fmysql\u89e3\u91ca\u5668\u3010\u8ba4\u4e3a\u3011\u5e94\u8be5\u67e5\u8be2\u7684\u884c\u6570\uff0c\u6709\u4eba\u7814\u7a76\u8fc7\u6e90\u7801\u53d1\u73b0\u8fd9\u4e2a\u73a9\u610f\u548c\u5b9e\u9645\u67e5\u8be2\u65f6\u7684\u8868\u73b0\u5e76\u6ca1\u6709\u592a\u591a\u5173\u7cfb\u3002<\/p>\n<p>\u7b80\u5355\u6765\u8bb2\u5c31\u662f\uff0c\u8fd9\u4e2arows\u503c\u53ea\u662fmysql\u6839\u636e\u7f13\u5b58\u6570\u636e\u7684\u4e00\u4e2a\u4f30\u7b97\uff0c\u53cd\u5e94\u7684\u662f\u5728\u53ea\u6709\u4e00\u5806\u6570\u636e\u5e76\u4e14\u6ca1\u6709\u7d22\u5f15\u65f6\u5e94\u8be5\u626b\u63cf\u7684\u884c\u6570\u3002<\/p>\n<p>\u52a0\u8fc7\u7d22\u5f15\u540erows\u503c\u7684\u8ba1\u7b97\u65b9\u6cd5\u548c\u4e0d\u52a0\u7d22\u5f15\u65f6\u76f8\u540c\uff0c\u4f9d\u7136\u4f1a\u51fa\u73b0\u51e0\u4e07\u884c\u7684\u60c5\u51b5\u3002\u4f46\u5b9e\u9645\u67e5\u8be2\u65f6mysql\u4f1a\u4f18\u5148\u8bfb\u53d6\u7d22\u5f15\uff0c\u6839\u636eB+\u6811\u7684\u5206\u652f\u548cLIMIT\u503c\u8fdb\u884c\u5224\u65ad\u3002<\/p>\n<p>\u4e5f\u5c31\u662f\u8bf4\u5b9e\u9645\u6267\u884c\u65f6\u53ef\u80fd\u53ea\u8bfb\u53d6\u4e86LIMIT\u6761\u6570\u636e\uff0c\u4f46\u662fEXPLAIN\u8fd9\u4e2a\u89e3\u91ca\u9884\u5224\u4e2d\u7684rows\u6570\u503c\u5374\u5f88\u5927\uff0c\u56e0\u4e3a\u8fd9\u662f\u672a\u4f18\u5316\u65f6\u7684\u9884\u5224\u7ed3\u679c\uff0c\u8fd9\u4e2a\u7b97\u6cd5\u5e76\u6ca1\u6709\u968f\u7740\u7d22\u5f15\u548c\u67e5\u8be2\u6761\u4ef6\u800c\u66f4\u65b0\u3002<\/p>\n<p>\u6240\u4ee5\u6839\u672c\u4e0d\u7528\u8003\u8651rows\u884c\u6570\u8fc7\u5927\u7684\u95ee\u9898\uff0c\u53ea\u8981\u7d22\u5f15\u6b63\u786e\u4e14\u540e\u9762\u6ca1\u6709\u7528\u5230filesort\uff0c\u67e5\u8be2\u65f6\u95f4\u4e5f\u4e0d\u957f\uff0c\u90a3\u4f60\u7684\u6570\u636e\u5e93\u8bbe\u8ba1\u5c31\u6ca1\u6709\u95ee\u9898\u3002<\/p>\n<p>\u7f51\u4e0a\u597d\u591a\u6587\u7ae0\u91cc\u5199\u7684rows\u503c\u8d8a\u5c0f\u8d8a\u597d\u5176\u5b9e\u662f\u8bef\u533a\uff0c\u6709\u65f6\u5019\u7d22\u5f15\u65e0\u8bba\u600e\u4e48\u5efa\u90fd\u4f1a\u8ba9rows\u663e\u793a\u5f88\u5927\uff0c\u8fd9\u4e2a\u8868\u8ff0\u662f\u9519\u8bef\u7684\u3002<\/p>\n<p>\u4f60\u7528InnoDB\u5f15\u64ce\u67e5\u8be2\u8bd5\u8bd5\uff0c\u6709\u7684\u65f6\u5019rows\u503c\u6bd4\u4f60\u6570\u636e\u8868\u4e2d\u603b\u884c\u6570\u8fd8\u8981\u5927\uff0c\u660e\u663e\u662f\u4e00\u4e2a\u7f13\u5b58<a href=\"https:\/\/docs.pingcode.com\/agile\/project-management\/estimation\" target=\"_blank\">\u4f30\u7b97<\/a>\u7ed3\u679c\u3002<\/p>\n<p><strong>\u5ef6\u4f38\u9605\u8bfb\uff1a<\/strong><\/p>\n<h2 class=\"wp-block-heading\"><strong>\u4e8c\u3001\u4ec0\u4e48\u662f\u6267\u884c\u8ba1\u5212<\/strong><\/h2>\n<p>\u6709\u4e86\u6162\u67e5\u8be2\u8bed\u53e5\u540e\uff0c\u5c31\u8981\u5bf9\u8bed\u53e5\u8fdb\u884c\u5206\u6790\u3002\u4e00\u6761\u67e5\u8be2\u8bed\u53e5\u5728\u7ecf\u8fc7MySQL\u67e5\u8be2\u4f18\u5316\u5668\u7684\u5404\u79cd\u57fa\u4e8e\u6210\u672c\u548c\u89c4\u5219\u7684\u4f18\u5316\u4f1a\u540e\u751f\u6210\u4e00\u4e2a\u6240\u8c13\u7684\u6267\u884c\u8ba1\u5212\uff0c\u8fd9\u4e2a\u6267\u884c\u8ba1\u5212\u5c55\u793a\u4e86\u63a5\u4e0b\u6765\u5177\u4f53\u6267\u884c\u67e5\u8be2\u7684\u65b9\u5f0f\uff0c\u6bd4\u5982\u591a\u8868\u8fde\u63a5\u7684\u987a\u5e8f\u662f\u4ec0\u4e48\uff0c\u5bf9\u4e8e\u6bcf\u4e2a\u8868\u91c7\u7528\u4ec0\u4e48\u8bbf\u95ee\u65b9\u6cd5\u6765\u5177\u4f53\u6267\u884c\u67e5\u8be2\u7b49\u7b49\u3002EXPLAIN\u8bed\u53e5\u6765\u5e2e\u52a9\u6211\u4eec\u67e5\u770b\u67d0\u4e2a\u67e5\u8be2\u8bed\u53e5\u7684\u5177\u4f53\u6267\u884c\u8ba1\u5212\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"row\u503c\u7684\u542b\u4e49\u662fmysql\u89e3\u91ca\u5668\u3010\u8ba4\u4e3a\u3011\u5e94\u8be5\u67e5\u8be2\u7684\u884c\u6570\uff0c\u6709\u4eba\u7814\u7a76\u8fc7\u6e90\u7801\u53d1\u73b0\u8fd9\u4e2a\u73a9\u610f\u548c\u5b9e\u9645\u67e5\u8be2\u65f6\u7684\u8868\u73b0\u5e76\u6ca1\u6709\u592a\u591a [&hellip;]","protected":false},"author":1,"featured_media":31523,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/31522"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=31522"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/31522\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/31523"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=31522"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=31522"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=31522"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}