{"id":188976,"date":"2024-11-12T03:29:22","date_gmt":"2024-11-11T19:29:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/188976\/"},"modified":"2024-11-12T03:29:23","modified_gmt":"2024-11-11T19:29:23","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%b8%80%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/188976\/","title":{"rendered":"\u63d0\u9ad8MySQL\u6578\u64da\u5eab\u67e5\u8a62\u6548\u7387\u7684\u6280\u5de7\uff08\u4e00\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%b8%80%ef%bc%89-qfzjAilgmI\">\u63d0\u9ad8MySQL\u6578\u64da\u5eab\u67e5\u8a62\u6548\u7387\u7684\u6280\u5de7\uff08\u4e00\uff09<\/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\u5ee3\u6cdb\u61c9\u7528\u65bc\u5404\u7a2e\u7db2\u7ad9\u548c\u61c9\u7528\u7a0b\u5e8f\u4e2d\u3002\u63d0\u9ad8MySQL\u6578\u64da\u5eab\u67e5\u8a62\u6548\u7387\u4e0d\u50c5\u80fd\u5920\u52a0\u5feb\u6578\u64da\u6aa2\u7d22\u901f\u5ea6\uff0c\u9084\u80fd\u63d0\u5347\u7528\u6236\u9ad4\u9a57\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u4e00\u4e9b\u63d0\u9ad8MySQL\u67e5\u8a62\u6548\u7387\u7684\u6280\u5de7\u3002<\/p>\n<h2 id=\"1-%e4%bd%bf%e7%94%a8%e7%b4%a2%e5%bc%95-qfzjAilgmI\">1. \u4f7f\u7528\u7d22\u5f15<\/h2>\n<p>\u7d22\u5f15\u662f\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u7684\u6700\u6709\u6548\u65b9\u6cd5\u4e4b\u4e00\u3002\u901a\u904e\u5728\u8868\u7684\u67d0\u4e9b\u5217\u4e0a\u5275\u5efa\u7d22\u5f15\uff0cMySQL\u53ef\u4ee5\u66f4\u5feb\u5730\u67e5\u627e\u6578\u64da\u3002\u7d22\u5f15\u985e\u4f3c\u65bc\u66f8\u7c4d\u7684\u76ee\u9304\uff0c\u80fd\u5920\u5e6b\u52a9\u6578\u64da\u5eab\u5feb\u901f\u5b9a\u4f4d\u5230\u6240\u9700\u7684\u6578\u64da\u3002<\/p>\n<ul>\n<li><strong>\u55ae\u5217\u7d22\u5f15\uff1a<\/strong>\u5c0d\u65bc\u7d93\u5e38\u7528\u65bc\u67e5\u8a62\u7684\u55ae\u4e00\u5217\uff0c\u53ef\u4ee5\u5275\u5efa\u55ae\u5217\u7d22\u5f15\u3002<\/li>\n<li><strong>\u8907\u5408\u7d22\u5f15\uff1a<\/strong>\u5c0d\u65bc\u7d93\u5e38\u4e00\u8d77\u67e5\u8a62\u7684\u591a\u500b\u5217\uff0c\u53ef\u4ee5\u5275\u5efa\u8907\u5408\u7d22\u5f15\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u5047\u8a2d\u6709\u4e00\u500b\u7528\u6236\u8868\uff0c\u7d93\u5e38\u6839\u64da\u7528\u6236\u540d\u548c\u96fb\u5b50\u90f5\u4ef6\u67e5\u8a62\u7528\u6236\u4fe1\u606f\uff0c\u53ef\u4ee5\u9019\u6a23\u5275\u5efa\u8907\u5408\u7d22\u5f15\uff1a<\/p>\n<pre><code>CREATE INDEX idx_username_email ON users (username, email);<\/code><\/pre>\n<h2 id=\"2-%e5%84%aa%e5%8c%96%e6%9f%a5%e8%a9%a2%e8%aa%9e%e5%8f%a5-qfzjAilgmI\">2. \u512a\u5316\u67e5\u8a62\u8a9e\u53e5<\/h2>\n<p>\u64b0\u5beb\u9ad8\u6548\u7684\u67e5\u8a62\u8a9e\u53e5\u662f\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u7684\u53e6\u4e00\u500b\u95dc\u9375\u56e0\u7d20\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u512a\u5316\u67e5\u8a62\u7684\u5efa\u8b70\uff1a<\/p>\n<ul>\n<li><strong>\u907f\u514dSELECT *\uff1a<\/strong>\u53ea\u9078\u64c7\u9700\u8981\u7684\u5217\uff0c\u9019\u6a23\u53ef\u4ee5\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\u6027\u80fd\u3002<\/li>\n<li><strong>\u4f7f\u7528LIMIT\u9650\u5236\u7d50\u679c\u96c6\uff1a<\/strong>\u5982\u679c\u53ea\u9700\u8981\u524d\u5e7e\u689d\u8a18\u9304\uff0c\u53ef\u4ee5\u4f7f\u7528LIMIT\u4f86\u9650\u5236\u8fd4\u56de\u7684\u884c\u6578\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u4ee5\u4e0b\u67e5\u8a62\u53ea\u9078\u64c7\u7528\u6236\u540d\u548c\u96fb\u5b50\u90f5\u4ef6\uff0c\u800c\u4e0d\u662f\u6240\u6709\u5217\uff1a<\/p>\n<pre><code>SELECT username, email FROM users WHERE status = 'active';<\/code><\/pre>\n<h2 id=\"3-%e6%ad%a3%e7%a2%ba%e4%bd%bf%e7%94%a8%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b-qfzjAilgmI\">3. \u6b63\u78ba\u4f7f\u7528\u6578\u64da\u985e\u578b<\/h2>\n<p>\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u4f7f\u7528\u904e\u5927\u7684\u6578\u64da\u985e\u578b\u6703\u6d6a\u8cbb\u5b58\u5132\u7a7a\u9593\uff0c\u4e26\u5f71\u97ff\u67e5\u8a62\u901f\u5ea6\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5efa\u8b70\uff1a<\/p>\n<ul>\n<li><strong>\u6574\u6578\u985e\u578b\uff1a<\/strong>\u5c0d\u65bc\u6574\u6578\u6578\u64da\uff0c\u4f7f\u7528INT\u800c\u4e0d\u662fBIGINT\uff0c\u9664\u975e\u78ba\u5be6\u9700\u8981\u66f4\u5927\u7684\u7bc4\u570d\u3002<\/li>\n<li><strong>\u5b57\u7b26\u985e\u578b\uff1a<\/strong>\u5c0d\u65bc\u77ed\u5b57\u7b26\u4e32\uff0c\u4f7f\u7528VARCHAR\u800c\u4e0d\u662fCHAR\uff0c\u9019\u6a23\u53ef\u4ee5\u7bc0\u7701\u7a7a\u9593\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u5c0d\u65bc\u7528\u6236\u5e74\u9f61\uff0c\u53ef\u4ee5\u4f7f\u7528TINYINT\u800c\u4e0d\u662fINT\uff1a<\/p>\n<pre><code>CREATE TABLE users (id INT AUTO_INCREMENT PRIMARY KEY, age TINYINT);<\/code><\/pre>\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-qfzjAilgmI\">4. \u5b9a\u671f\u7dad\u8b77\u6578\u64da\u5eab<\/h2>\n<p>\u5b9a\u671f\u7dad\u8b77\u6578\u64da\u5eab\u53ef\u4ee5\u5e6b\u52a9\u4fdd\u6301\u5176\u6027\u80fd\u3002\u9019\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>\u5206\u6790\u8868\uff1a<\/strong>\u4f7f\u7528ANALYZE TABLE\u547d\u4ee4\u4f86\u66f4\u65b0\u8868\u7684\u7d71\u8a08\u4fe1\u606f\u3002<\/li>\n<li><strong>\u512a\u5316\u8868\uff1a<\/strong>\u4f7f\u7528OPTIMIZE TABLE\u547d\u4ee4\u4f86\u91cd\u5efa\u8868\u4e26\u91cb\u653e\u672a\u4f7f\u7528\u7684\u7a7a\u9593\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u5c0d\u65bc\u4e00\u500b\u540d\u70bausers\u7684\u8868\uff0c\u53ef\u4ee5\u9019\u6a23\u9032\u884c\u7dad\u8b77\uff1a<\/p>\n<pre><code>ANALYZE TABLE users;<\/code><\/pre>\n<pre><code>OPTIMIZE TABLE users;<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-qfzjAilgmI\">\u7e3d\u7d50<\/h2>\n<p>\u63d0\u9ad8MySQL\u6578\u64da\u5eab\u67e5\u8a62\u6548\u7387\u662f\u4e00\u500b\u591a\u65b9\u9762\u7684\u904e\u7a0b\uff0c\u6d89\u53ca\u7d22\u5f15\u7684\u4f7f\u7528\u3001\u67e5\u8a62\u8a9e\u53e5\u7684\u512a\u5316\u3001\u6578\u64da\u985e\u578b\u7684\u9078\u64c7\u4ee5\u53ca\u5b9a\u671f\u7684\u6578\u64da\u5eab\u7dad\u8b77\u3002\u901a\u904e\u5be6\u65bd\u9019\u4e9b\u6280\u5de7\uff0c\u60a8\u53ef\u4ee5\u986f\u8457\u63d0\u5347\u6578\u64da\u5eab\u7684\u6027\u80fd\uff0c\u5f9e\u800c\u6539\u5584\u7528\u6236\u9ad4\u9a57\u3002\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u89e3\u6c7a\u65b9\u6848\u4f86\u6258\u7ba1\u60a8\u7684\u6578\u64da\u5eab\uff0c\u8003\u616e\u4f7f\u7528\u6211\u5011\u7684<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u670d\u52d9\uff0c\u70ba\u60a8\u7684\u61c9\u7528\u7a0b\u5e8f\u63d0\u4f9b\u7a69\u5b9a\u548c\u5feb\u901f\u7684\u652f\u6301\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-188976","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/188976","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=188976"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/188976\/revisions"}],"predecessor-version":[{"id":188977,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/188976\/revisions\/188977"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=188976"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=188976"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=188976"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}