{"id":188974,"date":"2024-11-12T03:28:21","date_gmt":"2024-11-11T19:28:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/188974\/"},"modified":"2024-11-12T03:28:22","modified_gmt":"2024-11-11T19:28:22","slug":"%e6%8f%90%e9%ab%98mysql%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9f%a5%e8%a9%a2%e6%95%88%e7%8e%87%e7%9a%84%e6%8a%80%e5%b7%a7%ef%bc%88%e4%ba%8c%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/188974\/","title":{"rendered":"\u63d0\u9ad8MySQL\u6578\u64da\u5eab\u67e5\u8a62\u6548\u7387\u7684\u6280\u5de7\uff08\u4e8c\uff09"},"content":{"rendered":"<h1 id=\"%e6%8f%90%e9%ab%98mysql%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9f%a5%e8%a9%a2%e6%95%88%e7%8e%87%e7%9a%84%e6%8a%80%e5%b7%a7%ef%bc%88%e4%ba%8c%ef%bc%89-IgsZtFACaY\">\u63d0\u9ad8MySQL\u6578\u64da\u5eab\u67e5\u8a62\u6548\u7387\u7684\u6280\u5de7\uff08\u4e8c\uff09<\/h1>\n<p>\u5728\u4e0a\u4e00\u7bc7\u6587\u7ae0\u4e2d\uff0c\u6211\u5011\u63a2\u8a0e\u4e86\u5e7e\u7a2e\u63d0\u9ad8MySQL\u6578\u64da\u5eab\u67e5\u8a62\u6548\u7387\u7684\u57fa\u672c\u6280\u5de7\uff0c\u5305\u62ec\u7d22\u5f15\u7684\u4f7f\u7528\u548c\u67e5\u8a62\u8a9e\u53e5\u7684\u512a\u5316\u3002\u5728\u9019\u7bc7\u6587\u7ae0\u4e2d\uff0c\u6211\u5011\u5c07\u6df1\u5165\u63a2\u8a0e\u66f4\u591a\u9032\u968e\u7684\u6280\u5de7\uff0c\u5e6b\u52a9\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u9032\u4e00\u6b65\u63d0\u5347\u67e5\u8a62\u6027\u80fd\u3002<\/p>\n<h2 id=\"1-%e4%bd%bf%e7%94%a8explain%e5%88%86%e6%9e%90%e6%9f%a5%e8%a9%a2-IgsZtFACaY\">1. \u4f7f\u7528EXPLAIN\u5206\u6790\u67e5\u8a62<\/h2>\n<p>\u5728\u512a\u5316\u67e5\u8a62\u4e4b\u524d\uff0c\u4e86\u89e3\u67e5\u8a62\u7684\u57f7\u884c\u8a08\u5283\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002MySQL\u63d0\u4f9b\u4e86EXPLAIN\u8a9e\u53e5\uff0c\u53ef\u4ee5\u5e6b\u52a9\u6211\u5011\u5206\u6790\u67e5\u8a62\u7684\u57f7\u884c\u904e\u7a0b\u3002\u901a\u904e\u57f7\u884c\u4ee5\u4e0b\u547d\u4ee4\uff0c\u6211\u5011\u53ef\u4ee5\u7372\u5f97\u67e5\u8a62\u7684\u8a73\u7d30\u4fe1\u606f\uff1a<\/p>\n<pre><code>EXPLAIN SELECT * FROM your_table WHERE your_condition;<\/code><\/pre>\n<p>EXPLAIN\u7684\u8f38\u51fa\u5c07\u986f\u793a\u6bcf\u500b\u8868\u7684\u8a2a\u554f\u985e\u578b\u3001\u4f7f\u7528\u7684\u7d22\u5f15\u3001\u884c\u6578\u4f30\u7b97\u7b49\u4fe1\u606f\u3002\u6839\u64da\u9019\u4e9b\u4fe1\u606f\uff0c\u6211\u5011\u53ef\u4ee5\u8b58\u5225\u51fa\u6027\u80fd\u74f6\u9838\uff0c\u4e26\u91dd\u5c0d\u6027\u5730\u9032\u884c\u512a\u5316\u3002<\/p>\n<h2 id=\"2-%e9%81%a9%e7%95%b6%e4%bd%bf%e7%94%a8join-IgsZtFACaY\">2. \u9069\u7576\u4f7f\u7528JOIN<\/h2>\n<p>\u5728\u9032\u884c\u591a\u8868\u67e5\u8a62\u6642\uff0cJOIN\u64cd\u4f5c\u7684\u4f7f\u7528\u65b9\u5f0f\u6703\u76f4\u63a5\u5f71\u97ff\u67e5\u8a62\u6027\u80fd\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u6700\u4f73\u5be6\u8e10\uff1a<\/p>\n<ul>\n<li><strong>\u9078\u64c7\u5408\u9069\u7684JOIN\u985e\u578b\uff1a<\/strong>\u6839\u64da\u9700\u6c42\u9078\u64c7INNER JOIN\u3001LEFT JOIN\u6216RIGHT JOIN\uff0c\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u64f4\u5c55\u3002<\/li>\n<li><strong>\u4f7f\u7528ON\u800c\u975eWHERE\u9032\u884cJOIN\u689d\u4ef6\uff1a<\/strong>\u5c07JOIN\u689d\u4ef6\u653e\u5728ON\u5b50\u53e5\u4e2d\uff0c\u800c\u4e0d\u662fWHERE\u5b50\u53e5\u4e2d\uff0c\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002<\/li>\n<li><strong>\u9650\u5236\u8fd4\u56de\u7684\u5217\uff1a<\/strong>\u53ea\u9078\u64c7\u9700\u8981\u7684\u5217\uff0c\u907f\u514d\u4f7f\u7528SELECT *\uff0c\u9019\u6a23\u53ef\u4ee5\u6e1b\u5c11\u6578\u64da\u50b3\u8f38\u91cf\u3002<\/li>\n<\/ul>\n<h2 id=\"3-%e4%bd%bf%e7%94%a8limit%e9%99%90%e5%88%b6%e7%b5%90%e6%9e%9c%e9%9b%86-IgsZtFACaY\">3. \u4f7f\u7528LIMIT\u9650\u5236\u7d50\u679c\u96c6<\/h2>\n<p>\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528LIMIT\u53ef\u4ee5\u6709\u6548\u6e1b\u5c11\u8fd4\u56de\u7684\u6578\u64da\u91cf\uff0c\u5f9e\u800c\u63d0\u9ad8\u67e5\u8a62\u901f\u5ea6\u3002\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u6578\u64da\u96c6\u6642\uff0c\u9019\u4e00\u6280\u5de7\u5c24\u70ba\u91cd\u8981\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT * FROM your_table WHERE your_condition LIMIT 10;<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u67e5\u8a62\u53ea\u6703\u8fd4\u56de\u524d10\u689d\u8a18\u9304\uff0c\u986f\u8457\u6e1b\u5c11\u4e86\u6578\u64da\u8655\u7406\u7684\u8ca0\u64d4\u3002<\/p>\n<h2 id=\"4-%e5%ae%9a%e6%9c%9f%e7%b6%ad%e8%ad%b7%e6%95%b8%e6%93%9a%e5%ba%ab-IgsZtFACaY\">4. \u5b9a\u671f\u7dad\u8b77\u6578\u64da\u5eab<\/h2>\n<p>\u6578\u64da\u5eab\u7684\u6027\u80fd\u96a8\u8457\u6642\u9593\u7684\u63a8\u79fb\u53ef\u80fd\u6703\u4e0b\u964d\uff0c\u56e0\u6b64\u5b9a\u671f\u7dad\u8b77\u662f\u5fc5\u8981\u7684\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u7dad\u8b77\u5efa\u8b70\uff1a<\/p>\n<ul>\n<li><strong>\u91cd\u5efa\u7d22\u5f15\uff1a<\/strong>\u96a8\u8457\u6578\u64da\u7684\u589e\u522a\u6539\uff0c\u7d22\u5f15\u53ef\u80fd\u6703\u8b8a\u5f97\u4e0d\u518d\u9ad8\u6548\u3002\u5b9a\u671f\u91cd\u5efa\u7d22\u5f15\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002<\/li>\n<li><strong>\u6e05\u7406\u4e0d\u5fc5\u8981\u7684\u6578\u64da\uff1a<\/strong>\u5b9a\u671f\u522a\u9664\u904e\u671f\u6216\u4e0d\u518d\u9700\u8981\u7684\u6578\u64da\uff0c\u6e1b\u5c11\u6578\u64da\u5eab\u7684\u8ca0\u64d4\u3002<\/li>\n<li><strong>\u66f4\u65b0\u7d71\u8a08\u4fe1\u606f\uff1a<\/strong>\u4f7f\u7528ANALYZE TABLE\u547d\u4ee4\u66f4\u65b0\u8868\u7684\u7d71\u8a08\u4fe1\u606f\uff0c\u4ee5\u4fbf\u67e5\u8a62\u512a\u5316\u5668\u80fd\u5920\u505a\u51fa\u66f4\u597d\u7684\u6c7a\u7b56\u3002<\/li>\n<\/ul>\n<h2 id=\"5-%e4%bd%bf%e7%94%a8%e7%b7%a9%e5%ad%98%e6%8a%80%e8%a1%93-IgsZtFACaY\">5. \u4f7f\u7528\u7de9\u5b58\u6280\u8853<\/h2>\n<p>\u7de9\u5b58\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u7279\u5225\u662f\u5c0d\u65bc\u91cd\u8907\u67e5\u8a62\u7684\u60c5\u6cc1\u3002MySQL\u63d0\u4f9b\u4e86\u591a\u7a2e\u7de9\u5b58\u6a5f\u5236\uff0c\u4f8b\u5982\uff1a<\/p>\n<ul>\n<li><strong>\u67e5\u8a62\u7de9\u5b58\uff1a<\/strong>\u555f\u7528\u67e5\u8a62\u7de9\u5b58\u53ef\u4ee5\u5b58\u5132\u67e5\u8a62\u7d50\u679c\uff0c\u5c0d\u65bc\u76f8\u540c\u7684\u67e5\u8a62\u8acb\u6c42\uff0c\u76f4\u63a5\u8fd4\u56de\u7de9\u5b58\u7d50\u679c\u3002<\/li>\n<li><strong>\u61c9\u7528\u5c64\u7de9\u5b58\uff1a<\/strong>\u4f7f\u7528Redis\u6216Memcached\u7b49\u7de9\u5b58\u7cfb\u7d71\uff0c\u5c07\u983b\u7e41\u8a2a\u554f\u7684\u6578\u64da\u5b58\u5132\u5728\u5167\u5b58\u4e2d\uff0c\u6e1b\u5c11\u5c0d\u6578\u64da\u5eab\u7684\u76f4\u63a5\u8a2a\u554f\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-IgsZtFACaY\">\u7e3d\u7d50<\/h2>\n<p>\u63d0\u9ad8MySQL\u6578\u64da\u5eab\u67e5\u8a62\u6548\u7387\u662f\u4e00\u500b\u6301\u7e8c\u7684\u904e\u7a0b\uff0c\u6d89\u53ca\u591a\u65b9\u9762\u7684\u6280\u8853\u548c\u7b56\u7565\u3002\u901a\u904e\u4f7f\u7528EXPLAIN\u5206\u6790\u67e5\u8a62\u3001\u9069\u7576\u4f7f\u7528JOIN\u3001\u9650\u5236\u7d50\u679c\u96c6\u3001\u5b9a\u671f\u7dad\u8b77\u6578\u64da\u5eab\u4ee5\u53ca\u5229\u7528\u7de9\u5b58\u6280\u8853\uff0c\u6211\u5011\u53ef\u4ee5\u986f\u8457\u63d0\u5347\u67e5\u8a62\u6027\u80fd\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684<a href=\"https:\/\/server.hk\">VPS<\/a>\u6216<a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a>\u89e3\u6c7a\u65b9\u6848\u4e5f\u662f\u81f3\u95dc\u91cd\u8981\u7684\uff0c\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u5eab\u904b\u884c\u5728\u6700\u4f73\u74b0\u5883\u4e2d\uff0c\u9032\u4e00\u6b65\u63d0\u5347\u6574\u9ad4\u6027\u80fd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22\u63d0\u9ad8MySQL\u6578\u64da\u5eab\u67e5\u8a62\u6548\u7387\u7684\u6280\u5de7\uff0c\u512a\u5316\u6027\u80fd\uff0c\u63d0\u5347\u97ff\u61c9\u901f\u5ea6\uff0c\u52a9\u529b\u6578\u64da\u7ba1\u7406\u66f4\u9ad8\u6548\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-188974","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/188974","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=188974"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/188974\/revisions"}],"predecessor-version":[{"id":188975,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/188974\/revisions\/188975"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=188974"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=188974"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=188974"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}