{"id":74859,"date":"2024-10-15T22:59:16","date_gmt":"2024-10-15T14:59:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/74859\/"},"modified":"2024-10-15T22:59:16","modified_gmt":"2024-10-15T14:59:16","slug":"mysql-sql%e6%85%a2%e6%9f%a5%e8%a9%a2%e5%84%aa%e5%8c%96%e7%b6%93%e6%ad%b7%e8%88%87%e8%99%95%e7%90%86%e6%96%b9%e6%a1%88","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/74859\/","title":{"rendered":"MySQL SQL\u6162\u67e5\u8a62\u512a\u5316\u7d93\u6b77\u8207\u8655\u7406\u65b9\u6848"},"content":{"rendered":"<h1 id=\"mysql-sql%e6%85%a2%e6%9f%a5%e8%a9%a2%e5%84%aa%e5%8c%96%e7%b6%93%e6%ad%b7%e8%88%87%e8%99%95%e7%90%86%e6%96%b9%e6%a1%88-uCKKxTabRj\">MySQL SQL\u6162\u67e5\u8a62\u512a\u5316\u7d93\u6b77\u8207\u8655\u7406\u65b9\u6848<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u6027\u80fd\u5c0d\u65bc\u61c9\u7528\u7a0b\u5e8f\u7684\u6574\u9ad4\u6548\u7387\u81f3\u95dc\u91cd\u8981\u3002MySQL\u4f5c\u70ba\u4e00\u500b\u6d41\u884c\u7684\u958b\u6e90\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u7d93\u5e38\u9762\u81e8\u6162\u67e5\u8a62\u7684\u6311\u6230\u3002\u672c\u6587\u5c07\u5206\u4eab\u4e00\u4e9bMySQL\u6162\u67e5\u8a62\u7684\u512a\u5316\u7d93\u6b77\u8207\u8655\u7406\u65b9\u6848\uff0c\u5e6b\u52a9\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u63d0\u9ad8\u6578\u64da\u5eab\u6027\u80fd\u3002<\/p>\n<h2 id=\"%e6%85%a2%e6%9f%a5%e8%a9%a2%e7%9a%84%e5%ae%9a%e7%be%a9-uCKKxTabRj\">\u6162\u67e5\u8a62\u7684\u5b9a\u7fa9<\/h2>\n<p>\u6162\u67e5\u8a62\u662f\u6307\u57f7\u884c\u6642\u9593\u8d85\u904e\u9810\u8a2d\u95be\u503c\u7684SQL\u67e5\u8a62\u3002\u9019\u4e9b\u67e5\u8a62\u4e0d\u50c5\u5f71\u97ff\u61c9\u7528\u7a0b\u5e8f\u7684\u97ff\u61c9\u6642\u9593\uff0c\u9084\u53ef\u80fd\u5c0e\u81f4\u8cc7\u6e90\u7684\u6d6a\u8cbb\u3002MySQL\u63d0\u4f9b\u4e86\u6162\u67e5\u8a62\u65e5\u8a8c\u529f\u80fd\uff0c\u5e6b\u52a9\u7528\u6236\u8b58\u5225\u548c\u5206\u6790\u9019\u4e9b\u67e5\u8a62\u3002<\/p>\n<h2 id=\"%e5%95%9f%e7%94%a8%e6%85%a2%e6%9f%a5%e8%a9%a2%e6%97%a5%e8%aa%8c-uCKKxTabRj\">\u555f\u7528\u6162\u67e5\u8a62\u65e5\u8a8c<\/h2>\n<p>\u8981\u512a\u5316\u6162\u67e5\u8a62\uff0c\u9996\u5148\u9700\u8981\u555f\u7528\u6162\u67e5\u8a62\u65e5\u8a8c\u3002\u53ef\u4ee5\u901a\u904e\u4ee5\u4e0b\u6b65\u9a5f\u9032\u884c\u8a2d\u7f6e\uff1a<\/p>\n<pre><code>SET GLOBAL slow_query_log = 'ON';\nSET GLOBAL long_query_time = 1;  -- \u8a2d\u7f6e\u67e5\u8a62\u6642\u9593\u95be\u503c\u70ba1\u79d2\n<\/code><\/pre>\n<p>\u9019\u6a23\uff0c\u6240\u6709\u57f7\u884c\u6642\u9593\u8d85\u904e1\u79d2\u7684\u67e5\u8a62\u5c07\u88ab\u8a18\u9304\u5230\u6162\u67e5\u8a62\u65e5\u8a8c\u4e2d\uff0c\u65b9\u4fbf\u5f8c\u7e8c\u5206\u6790\u3002<\/p>\n<h2 id=\"%e5%88%86%e6%9e%90%e6%85%a2%e6%9f%a5%e8%a9%a2%e6%97%a5%e8%aa%8c-uCKKxTabRj\">\u5206\u6790\u6162\u67e5\u8a62\u65e5\u8a8c<\/h2>\n<p>\u4f7f\u7528\u5de5\u5177\u5982 <code>pt-query-digest<\/code> \u53ef\u4ee5\u5e6b\u52a9\u5206\u6790\u6162\u67e5\u8a62\u65e5\u8a8c\uff0c\u751f\u6210\u5831\u544a\uff0c\u8b58\u5225\u6700\u8017\u6642\u7684\u67e5\u8a62\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>pt-query-digest \/path\/to\/slow-query.log\n<\/code><\/pre>\n<p>\u9019\u5c07\u63d0\u4f9b\u67e5\u8a62\u7684\u57f7\u884c\u6b21\u6578\u3001\u5e73\u5747\u57f7\u884c\u6642\u9593\u7b49\u4fe1\u606f\uff0c\u5e6b\u52a9\u6211\u5011\u627e\u51fa\u6027\u80fd\u74f6\u9838\u3002<\/p>\n<h2 id=\"%e5%84%aa%e5%8c%96%e6%9f%a5%e8%a9%a2-uCKKxTabRj\">\u512a\u5316\u67e5\u8a62<\/h2>\n<p>\u4e00\u65e6\u8b58\u5225\u51fa\u6162\u67e5\u8a62\uff0c\u63a5\u4e0b\u4f86\u7684\u6b65\u9a5f\u662f\u512a\u5316\u9019\u4e9b\u67e5\u8a62\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u512a\u5316\u65b9\u6cd5\uff1a<\/p>\n<ul>\n<li><strong>\u4f7f\u7528\u7d22\u5f15\uff1a<\/strong>\u78ba\u4fdd\u67e5\u8a62\u4e2d\u4f7f\u7528\u7684\u5217\u6709\u9069\u7576\u7684\u7d22\u5f15\u3002\u7d22\u5f15\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002<\/li>\n<li><strong>\u907f\u514dSELECT *\uff1a<\/strong>\u53ea\u9078\u64c7\u9700\u8981\u7684\u5217\uff0c\u6e1b\u5c11\u6578\u64da\u50b3\u8f38\u91cf\u3002<\/li>\n<li><strong>\u4f7f\u7528JOIN\u800c\u975e\u5b50\u67e5\u8a62\uff1a<\/strong>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u4f7f\u7528JOIN\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002<\/li>\n<li><strong>\u9650\u5236\u7d50\u679c\u96c6\uff1a<\/strong>\u4f7f\u7528LIMIT\u4f86\u9650\u5236\u8fd4\u56de\u7684\u884c\u6578\uff0c\u7279\u5225\u662f\u5728\u4e0d\u9700\u8981\u5168\u90e8\u6578\u64da\u7684\u60c5\u6cc1\u4e0b\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%9b%a3%e6%8e%a7%e8%88%87%e8%aa%bf%e6%95%b4-uCKKxTabRj\">\u76e3\u63a7\u8207\u8abf\u6574<\/h2>\n<p>\u512a\u5316\u67e5\u8a62\u5f8c\uff0c\u6301\u7e8c\u76e3\u63a7\u6578\u64da\u5eab\u6027\u80fd\u662f\u5fc5\u8981\u7684\u3002\u53ef\u4ee5\u4f7f\u7528MySQL\u7684\u6027\u80fd\u6a21\u5f0f\uff08Performance Schema\uff09\u4f86\u7372\u53d6\u66f4\u8a73\u7d30\u7684\u6027\u80fd\u6578\u64da\uff0c\u4e26\u6839\u64da\u9700\u8981\u9032\u884c\u8abf\u6574\u3002<\/p>\n<h2 id=\"%e5%af%a6%e9%9a%9b%e6%a1%88%e4%be%8b-uCKKxTabRj\">\u5be6\u969b\u6848\u4f8b<\/h2>\n<p>\u5728\u4e00\u6b21\u5be6\u969b\u7684\u9805\u76ee\u4e2d\uff0c\u6211\u5011\u767c\u73fe\u4e00\u500b\u67e5\u8a62\u7684\u57f7\u884c\u6642\u9593\u9577\u905410\u79d2\u3002\u901a\u904e\u5206\u6790\u6162\u67e5\u8a62\u65e5\u8a8c\uff0c\u6211\u5011\u767c\u73fe\u8a72\u67e5\u8a62\u4f7f\u7528\u4e86\u4e0d\u5fc5\u8981\u7684\u5b50\u67e5\u8a62\uff0c\u4e26\u4e14\u7f3a\u5c11\u7d22\u5f15\u3002\u7d93\u904e\u512a\u5316\u5f8c\uff0c\u67e5\u8a62\u6642\u9593\u7e2e\u77ed\u81f30.5\u79d2\uff0c\u986f\u8457\u63d0\u9ad8\u4e86\u61c9\u7528\u7a0b\u5e8f\u7684\u97ff\u61c9\u901f\u5ea6\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-uCKKxTabRj\">\u7d50\u8ad6<\/h2>\n<p>MySQL\u7684\u6162\u67e5\u8a62\u554f\u984c\u662f\u8a31\u591a\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u9762\u81e8\u7684\u6311\u6230\u3002\u901a\u904e\u555f\u7528\u6162\u67e5\u8a62\u65e5\u8a8c\u3001\u5206\u6790\u67e5\u8a62\u3001\u512a\u5316SQL\u8a9e\u53e5\u4ee5\u53ca\u6301\u7e8c\u76e3\u63a7\u6027\u80fd\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u89e3\u6c7a\u9019\u4e9b\u554f\u984c\u3002\u9019\u4e0d\u50c5\u80fd\u63d0\u9ad8\u6578\u64da\u5eab\u7684\u6027\u80fd\uff0c\u9084\u80fd\u63d0\u5347\u7528\u6236\u9ad4\u9a57\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u904b\u884c\u60a8\u7684MySQL\u6578\u64da\u5eab\uff0cServer.HK\u63d0\u4f9b\u7a69\u5b9a\u53ef\u9760\u7684\u670d\u52d9\uff0c\u52a9\u60a8\u8f15\u9b06\u7ba1\u7406\u6578\u64da\u5eab\u6027\u80fd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22MySQL\u6162\u67e5\u8a62\u7684\u512a\u5316\u7d93\u6b77\u8207\u8655\u7406\u65b9\u6848\uff0c\u63d0\u5347\u6578\u64da\u5eab\u6027\u80fd\uff0c\u89e3\u6c7a\u67e5\u8a62\u6548\u7387\u554f\u984c\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-74859","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/74859","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=74859"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/74859\/revisions"}],"predecessor-version":[{"id":74860,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/74859\/revisions\/74860"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=74859"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=74859"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=74859"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}