{"id":168235,"date":"2024-11-06T10:39:28","date_gmt":"2024-11-06T02:39:28","guid":{"rendered":"https:\/\/server.hk\/cnblog\/168235\/"},"modified":"2024-11-06T10:39:29","modified_gmt":"2024-11-06T02:39:29","slug":"%e6%85%a2-sql-%e5%88%86%e6%9e%90%e8%88%87%e5%84%aa%e5%8c%96","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/168235\/","title":{"rendered":"\u6162 SQL \u5206\u6790\u8207\u512a\u5316"},"content":{"rendered":"<h1 id=\"%e6%85%a2-sql-%e5%88%86%e6%9e%90%e8%88%87%e5%84%aa%e5%8c%96-qiCbHrlkcM\">\u6162 SQL \u5206\u6790\u8207\u512a\u5316<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0cSQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u8207\u6578\u64da\u5eab\u9032\u884c\u4ea4\u4e92\u7684\u4e3b\u8981\u5de5\u5177\u3002\u7136\u800c\uff0c\u96a8\u8457\u6578\u64da\u91cf\u7684\u589e\u9577\uff0c\u8a31\u591a\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u9762\u81e8\u8457\u6162 SQL \u67e5\u8a62\u7684\u6311\u6230\u3002\u6162\u67e5\u8a62\u4e0d\u50c5\u5f71\u97ff\u61c9\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\uff0c\u9084\u53ef\u80fd\u5c0e\u81f4\u7528\u6236\u9ad4\u9a57\u7684\u4e0b\u964d\u3002\u56e0\u6b64\uff0c\u4e86\u89e3\u6162 SQL \u7684\u5206\u6790\u8207\u512a\u5316\u65b9\u6cd5\u81f3\u95dc\u91cd\u8981\u3002<\/p>\n<h2 id=\"%e6%85%a2-sql-%e6%9f%a5%e8%a9%a2%e7%9a%84%e5%8e%9f%e5%9b%a0-qiCbHrlkcM\">\u6162 SQL \u67e5\u8a62\u7684\u539f\u56e0<\/h2>\n<p>\u6162 SQL \u67e5\u8a62\u7684\u539f\u56e0\u591a\u7a2e\u591a\u6a23\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u56e0\u7d20\uff1a<\/p>\n<ul>\n<li><strong>\u7f3a\u4e4f\u7d22\u5f15\uff1a<\/strong>\u7d22\u5f15\u662f\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u7684\u95dc\u9375\u3002\u5982\u679c\u8868\u4e2d\u7f3a\u5c11\u9069\u7576\u7684\u7d22\u5f15\uff0c\u6578\u64da\u5eab\u5728\u67e5\u8a62\u6642\u9700\u8981\u6383\u63cf\u6574\u500b\u8868\uff0c\u9019\u6703\u5c0e\u81f4\u6027\u80fd\u4e0b\u964d\u3002<\/li>\n<li><strong>\u4e0d\u7576\u7684\u67e5\u8a62\u8a2d\u8a08\uff1a<\/strong>\u8907\u96dc\u7684\u67e5\u8a62\u6216\u4e0d\u5408\u7406\u7684 JOIN \u64cd\u4f5c\u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u554f\u984c\u3002\u4f8b\u5982\uff0c\u4f7f\u7528\u4e0d\u5fc5\u8981\u7684\u5b50\u67e5\u8a62\u6216\u904e\u591a\u7684 JOIN \u53ef\u80fd\u6703\u589e\u52a0\u67e5\u8a62\u7684\u57f7\u884c\u6642\u9593\u3002<\/li>\n<li><strong>\u6578\u64da\u91cf\u904e\u5927\uff1a<\/strong>\u96a8\u8457\u6578\u64da\u91cf\u7684\u589e\u52a0\uff0c\u67e5\u8a62\u7684\u57f7\u884c\u6642\u9593\u4e5f\u6703\u96a8\u4e4b\u589e\u52a0\u3002\u7279\u5225\u662f\u5728\u6c92\u6709\u9069\u7576\u7684\u5206\u5340\u6216\u5206\u7247\u7684\u60c5\u6cc1\u4e0b\uff0c\u67e5\u8a62\u6027\u80fd\u6703\u53d7\u5230\u5f71\u97ff\u3002<\/li>\n<li><strong>\u786c\u9ad4\u9650\u5236\uff1a<\/strong>\u4f3a\u670d\u5668\u7684 CPU\u3001\u5167\u5b58\u548c\u78c1\u789f I\/O \u6027\u80fd\u4e5f\u6703\u5f71\u97ff SQL \u67e5\u8a62\u7684\u57f7\u884c\u901f\u5ea6\u3002\u5982\u679c\u786c\u9ad4\u8cc7\u6e90\u4e0d\u8db3\uff0c\u67e5\u8a62\u6027\u80fd\u5c07\u53d7\u5230\u9650\u5236\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%85%a2-sql-%e6%9f%a5%e8%a9%a2%e7%9a%84%e5%88%86%e6%9e%90-qiCbHrlkcM\">\u6162 SQL \u67e5\u8a62\u7684\u5206\u6790<\/h2>\n<p>\u70ba\u4e86\u512a\u5316\u6162 SQL \u67e5\u8a62\uff0c\u9996\u5148\u9700\u8981\u9032\u884c\u5206\u6790\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u7528\u7684\u5206\u6790\u65b9\u6cd5\uff1a<\/p>\n<ul>\n<li><strong>\u4f7f\u7528 EXPLAIN \u8a9e\u53e5\uff1a<\/strong>\u5728 SQL \u67e5\u8a62\u524d\u52a0\u4e0a EXPLAIN\uff0c\u53ef\u4ee5\u7372\u5f97\u67e5\u8a62\u7684\u57f7\u884c\u8a08\u5283\uff0c\u5e6b\u52a9\u8b58\u5225\u6027\u80fd\u74f6\u9838\u3002\u4f8b\u5982\uff1a<\/li>\n<pre><code>EXPLAIN SELECT * FROM users WHERE age &gt; 30;<\/code><\/pre>\n<li><strong>\u67e5\u8a62\u65e5\u8a8c\uff1a<\/strong>\u555f\u7528\u6578\u64da\u5eab\u7684\u67e5\u8a62\u65e5\u8a8c\u529f\u80fd\uff0c\u53ef\u4ee5\u8a18\u9304\u6240\u6709\u57f7\u884c\u7684\u67e5\u8a62\u53ca\u5176\u57f7\u884c\u6642\u9593\uff0c\u5e6b\u52a9\u8b58\u5225\u6162\u67e5\u8a62\u3002<\/li>\n<li><strong>\u6027\u80fd\u76e3\u63a7\u5de5\u5177\uff1a<\/strong>\u4f7f\u7528\u6027\u80fd\u76e3\u63a7\u5de5\u5177\uff08\u5982 MySQL \u7684 Performance Schema \u6216\u7b2c\u4e09\u65b9\u5de5\u5177\uff09\u53ef\u4ee5\u5be6\u6642\u76e3\u63a7\u67e5\u8a62\u6027\u80fd\uff0c\u4e26\u63d0\u4f9b\u8a73\u7d30\u7684\u6027\u80fd\u5831\u544a\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%85%a2-sql-%e6%9f%a5%e8%a9%a2%e7%9a%84%e5%84%aa%e5%8c%96-qiCbHrlkcM\">\u6162 SQL \u67e5\u8a62\u7684\u512a\u5316<\/h2>\n<p>\u5728\u5206\u6790\u4e86\u6162 SQL \u67e5\u8a62\u5f8c\uff0c\u53ef\u4ee5\u63a1\u53d6\u4ee5\u4e0b\u512a\u5316\u63aa\u65bd\uff1a<\/p>\n<ul>\n<li><strong>\u6dfb\u52a0\u7d22\u5f15\uff1a<\/strong>\u6839\u64da\u67e5\u8a62\u7684 WHERE \u5b50\u53e5\u548c JOIN \u689d\u4ef6\uff0c\u70ba\u76f8\u95dc\u5217\u6dfb\u52a0\u7d22\u5f15\u3002\u4f8b\u5982\uff1a<\/li>\n<pre><code>CREATE INDEX idx_age ON users(age);<\/code><\/pre>\n<li><strong>\u7c21\u5316\u67e5\u8a62\uff1a<\/strong>\u91cd\u69cb\u8907\u96dc\u7684\u67e5\u8a62\uff0c\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u5b50\u67e5\u8a62\u548c JOIN\u3002\u4f8b\u5982\uff0c\u5c07\u591a\u500b\u67e5\u8a62\u5408\u4f75\u70ba\u4e00\u500b\u67e5\u8a62\uff0c\u6216\u4f7f\u7528\u81e8\u6642\u8868\u4f86\u5b58\u5132\u4e2d\u9593\u7d50\u679c\u3002<\/li>\n<li><strong>\u6578\u64da\u5206\u5340\uff1a<\/strong>\u5c0d\u65bc\u5927\u578b\u8868\uff0c\u53ef\u4ee5\u8003\u616e\u4f7f\u7528\u6578\u64da\u5206\u5340\u6280\u8853\uff0c\u5c07\u6578\u64da\u5206\u6563\u5230\u591a\u500b\u7269\u7406\u5340\u57df\uff0c\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002<\/li>\n<li><strong>\u512a\u5316\u786c\u9ad4\uff1a<\/strong>\u5982\u679c\u53ef\u80fd\uff0c\u5347\u7d1a\u4f3a\u670d\u5668\u7684\u786c\u9ad4\u914d\u7f6e\uff0c\u4f8b\u5982\u589e\u52a0\u5167\u5b58\u6216\u4f7f\u7528\u66f4\u5feb\u7684 SSD \u78c1\u789f\uff0c\u4ee5\u63d0\u9ad8\u6574\u9ad4\u6027\u80fd\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-qiCbHrlkcM\">\u7d50\u8ad6<\/h2>\n<p>\u6162 SQL \u67e5\u8a62\u662f\u8a31\u591a\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u9762\u81e8\u7684\u6311\u6230\u3002\u901a\u904e\u5c0d\u6162\u67e5\u8a62\u7684\u5206\u6790\u548c\u512a\u5316\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u6578\u64da\u5eab\u7684\u6027\u80fd\u548c\u7528\u6236\u9ad4\u9a57\u3002\u7121\u8ad6\u662f\u6dfb\u52a0\u7d22\u5f15\u3001\u7c21\u5316\u67e5\u8a62\u9084\u662f\u5347\u7d1a\u786c\u9ad4\uff0c\u9019\u4e9b\u63aa\u65bd\u90fd\u80fd\u6709\u6548\u6539\u5584\u67e5\u8a62\u901f\u5ea6\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u80fd\u7684\u61c9\u7528\u7a0b\u5e8f\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> \u4e5f\u662f\u4e00\u500b\u91cd\u8981\u7684\u8003\u91cf\uff0c\u56e0\u70ba\u9019\u5c07\u76f4\u63a5\u5f71\u97ff\u5230\u6578\u64da\u5eab\u7684\u904b\u884c\u6548\u7387\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6df1\u5165\u63a2\u8a0e\u6162 SQL \u5206\u6790\u8207\u512a\u5316\u6280\u8853\uff0c\u63d0\u5347\u6578\u64da\u5eab\u6027\u80fd\uff0c\u6e1b\u5c11\u67e5\u8a62\u6642\u9593\uff0c\u78ba\u4fdd\u7cfb\u7d71\u9ad8\u6548\u904b\u884c\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-168235","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168235","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=168235"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168235\/revisions"}],"predecessor-version":[{"id":168236,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168235\/revisions\/168236"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=168235"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=168235"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=168235"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}