{"id":160809,"date":"2024-11-04T01:11:27","date_gmt":"2024-11-03T17:11:27","guid":{"rendered":"https:\/\/server.hk\/cnblog\/160809\/"},"modified":"2024-11-04T01:11:28","modified_gmt":"2024-11-03T17:11:28","slug":"%e8%b3%87%e6%96%99%e5%ba%ab%e6%95%99%e7%a8%8b%ef%bc%9amysql-%e4%bf%ae%e6%94%b9%e5%92%8c%e5%88%aa%e9%99%a4%e7%b4%a2%e5%bc%95%ef%bc%88drop-index%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/160809\/","title":{"rendered":"\u8cc7\u6599\u5eab\u6559\u7a0b\uff1aMySQL \u4fee\u6539\u548c\u522a\u9664\u7d22\u5f15\uff08DROP INDEX\uff09"},"content":{"rendered":"<h1 id=\"%e8%b3%87%e6%96%99%e5%ba%ab%e6%95%99%e7%a8%8b%ef%bc%9amysql-%e4%bf%ae%e6%94%b9%e5%92%8c%e5%88%aa%e9%99%a4%e7%b4%a2%e5%bc%95%ef%bc%88drop-index%ef%bc%89-XvRqDEqRHy\">\u8cc7\u6599\u5eab\u6559\u7a0b\uff1aMySQL \u4fee\u6539\u548c\u522a\u9664\u7d22\u5f15\uff08DROP INDEX\uff09<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u4e2d\uff0c\u7d22\u5f15\u662f\u4e00\u500b\u91cd\u8981\u7684\u6982\u5ff5\uff0c\u5b83\u80fd\u5920\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u7684\u6548\u7387\u3002\u7136\u800c\uff0c\u96a8\u8457\u8cc7\u6599\u5eab\u7684\u767c\u5c55\uff0c\u53ef\u80fd\u6703\u51fa\u73fe\u9700\u8981\u4fee\u6539\u6216\u522a\u9664\u7d22\u5f15\u7684\u60c5\u6cc1\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u5982\u4f55\u5728 MySQL \u4e2d\u4fee\u6539\u548c\u522a\u9664\u7d22\u5f15\uff0c\u7279\u5225\u662f\u4f7f\u7528 <code>DROPO INDEX<\/code> \u8a9e\u53e5\u7684\u76f8\u95dc\u64cd\u4f5c\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e7%b4%a2%e5%bc%95%ef%bc%9f-XvRqDEqRHy\">\u4ec0\u9ebc\u662f\u7d22\u5f15\uff1f<\/h2>\n<p>\u7d22\u5f15\u662f\u4e00\u7a2e\u6578\u64da\u7d50\u69cb\uff0c\u7528\u65bc\u52a0\u901f\u8cc7\u6599\u5eab\u67e5\u8a62\u7684\u901f\u5ea6\u3002\u5b83\u985e\u4f3c\u65bc\u66f8\u7c4d\u7684\u76ee\u9304\uff0c\u80fd\u5920\u5e6b\u52a9\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u5feb\u901f\u5b9a\u4f4d\u5230\u6240\u9700\u7684\u6578\u64da\u3002\u7d22\u5f15\u53ef\u4ee5\u662f\u55ae\u5217\u7684\uff0c\u4e5f\u53ef\u4ee5\u662f\u591a\u5217\u7684\uff0c\u4e26\u4e14\u53ef\u4ee5\u6839\u64da\u4e0d\u540c\u7684\u9700\u6c42\u9078\u64c7\u4e0d\u540c\u7684\u7d22\u5f15\u985e\u578b\uff0c\u5982 B-tree \u7d22\u5f15\u3001\u54c8\u5e0c\u7d22\u5f15\u7b49\u3002<\/p>\n<h2 id=\"%e7%82%ba%e4%bb%80%e9%ba%bc%e9%9c%80%e8%a6%81%e5%88%aa%e9%99%a4%e7%b4%a2%e5%bc%95%ef%bc%9f-XvRqDEqRHy\">\u70ba\u4ec0\u9ebc\u9700\u8981\u522a\u9664\u7d22\u5f15\uff1f<\/h2>\n<p>\u96d6\u7136\u7d22\u5f15\u80fd\u5920\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u522a\u9664\u7d22\u5f15\u662f\u5fc5\u8981\u7684\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u539f\u56e0\uff1a<\/p>\n<ul>\n<li>\u7d22\u5f15\u4e0d\u518d\u88ab\u4f7f\u7528\uff1a\u96a8\u8457\u8cc7\u6599\u5eab\u7684\u8b8a\u5316\uff0c\u67d0\u4e9b\u7d22\u5f15\u53ef\u80fd\u4e0d\u518d\u88ab\u67e5\u8a62\u4f7f\u7528\u3002<\/li>\n<li>\u6027\u80fd\u554f\u984c\uff1a\u904e\u591a\u7684\u7d22\u5f15\u6703\u5f71\u97ff\u8cc7\u6599\u7684\u63d2\u5165\u3001\u66f4\u65b0\u548c\u522a\u9664\u64cd\u4f5c\u7684\u6027\u80fd\u3002<\/li>\n<li>\u8cc7\u6599\u7d50\u69cb\u8b8a\u66f4\uff1a\u7576\u8cc7\u6599\u8868\u7684\u7d50\u69cb\u767c\u751f\u8b8a\u5316\u6642\uff0c\u67d0\u4e9b\u7d22\u5f15\u53ef\u80fd\u9700\u8981\u88ab\u522a\u9664\u6216\u91cd\u65b0\u5275\u5efa\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e5%88%aa%e9%99%a4%e7%b4%a2%e5%bc%95-XvRqDEqRHy\">\u5982\u4f55\u522a\u9664\u7d22\u5f15<\/h2>\n<p>\u5728 MySQL \u4e2d\uff0c\u522a\u9664\u7d22\u5f15\u7684\u8a9e\u6cd5\u76f8\u5c0d\u7c21\u55ae\u3002\u4f7f\u7528 <code>DROP INDEX<\/code> \u8a9e\u53e5\u53ef\u4ee5\u8f15\u9b06\u5730\u522a\u9664\u4e0d\u518d\u9700\u8981\u7684\u7d22\u5f15\u3002\u4ee5\u4e0b\u662f\u57fa\u672c\u7684\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>DROP INDEX index_name ON table_name;<\/code><\/pre>\n<p>\u5176\u4e2d\uff0c<code>index_name<\/code> \u662f\u8981\u522a\u9664\u7684\u7d22\u5f15\u540d\u7a31\uff0c<code>table_name<\/code> \u662f\u8a72\u7d22\u5f15\u6240\u5c6c\u7684\u8cc7\u6599\u8868\u540d\u7a31\u3002<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b-XvRqDEqRHy\">\u793a\u4f8b<\/h3>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>employees<\/code> \u7684\u8cc7\u6599\u8868\uff0c\u4e26\u4e14\u6211\u5011\u60f3\u8981\u522a\u9664\u540d\u70ba <code>idx_lastname<\/code> \u7684\u7d22\u5f15\uff0c\u5247\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b SQL \u8a9e\u53e5\uff1a<\/p>\n<pre><code>DROP INDEX idx_lastname ON employees;<\/code><\/pre>\n<p>\u57f7\u884c\u4e0a\u8ff0\u8a9e\u53e5\u5f8c\uff0c<code>idx_lastname<\/code> \u7d22\u5f15\u5c07\u88ab\u522a\u9664\uff0c\u9019\u6a23\u5728\u9032\u884c\u8cc7\u6599\u63d2\u5165\u6216\u66f4\u65b0\u6642\uff0c\u6027\u80fd\u53ef\u80fd\u6703\u6709\u6240\u6539\u5584\u3002<\/p>\n<h2 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e6%94%b9%e7%b4%a2%e5%bc%95-XvRqDEqRHy\">\u5982\u4f55\u4fee\u6539\u7d22\u5f15<\/h2>\n<p>\u5728 MySQL \u4e2d\uff0c\u4e26\u6c92\u6709\u76f4\u63a5\u7684\u8a9e\u6cd5\u4f86\u4fee\u6539\u7d22\u5f15\u3002\u5982\u679c\u9700\u8981\u4fee\u6539\u7d22\u5f15\uff0c\u901a\u5e38\u7684\u505a\u6cd5\u662f\u5148\u522a\u9664\u820a\u7684\u7d22\u5f15\uff0c\u7136\u5f8c\u518d\u5275\u5efa\u4e00\u500b\u65b0\u7684\u7d22\u5f15\u3002\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u65b0\u7684\u7d22\u5f15\u7b26\u5408\u7576\u524d\u7684\u9700\u6c42\u3002<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b-XvRqDEqRHy\">\u793a\u4f8b<\/h3>\n<p>\u5047\u8a2d\u6211\u5011\u9700\u8981\u4fee\u6539 <code>employees<\/code> \u8cc7\u6599\u8868\u4e2d\u7684 <code>idx_lastname<\/code> \u7d22\u5f15\uff0c\u5c07\u5176\u6539\u70ba\u591a\u5217\u7d22\u5f15\uff0c\u9996\u5148\u9700\u8981\u522a\u9664\u820a\u7684\u7d22\u5f15\uff1a<\/p>\n<pre><code>DROP INDEX idx_lastname ON employees;<\/code><\/pre>\n<p>\u7136\u5f8c\uff0c\u5275\u5efa\u65b0\u7684\u591a\u5217\u7d22\u5f15\uff1a<\/p>\n<pre><code>CREATE INDEX idx_name ON employees (lastname, firstname);<\/code><\/pre>\n<p>\u9019\u6a23\uff0c\u6211\u5011\u5c31\u6210\u529f\u5730\u4fee\u6539\u4e86\u7d22\u5f15\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-XvRqDEqRHy\">\u7e3d\u7d50<\/h2>\n<p>\u5728 MySQL \u4e2d\uff0c\u7d22\u5f15\u7684\u7ba1\u7406\u5c0d\u65bc\u8cc7\u6599\u5eab\u6027\u80fd\u81f3\u95dc\u91cd\u8981\u3002\u901a\u904e\u4f7f\u7528 <code>DROPO INDEX<\/code> \u8a9e\u53e5\uff0c\u6211\u5011\u53ef\u4ee5\u6709\u6548\u5730\u522a\u9664\u4e0d\u518d\u9700\u8981\u7684\u7d22\u5f15\uff0c\u4e26\u901a\u904e\u522a\u9664\u820a\u7d22\u5f15\u5f8c\u5275\u5efa\u65b0\u7d22\u5f15\u7684\u65b9\u5f0f\u4f86\u9032\u884c\u4fee\u6539\u3002\u9019\u4e9b\u64cd\u4f5c\u80fd\u5920\u5e6b\u52a9\u6211\u5011\u4fdd\u6301\u8cc7\u6599\u5eab\u7684\u9ad8\u6548\u904b\u884c\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u8cc7\u6599\u5eab\u7ba1\u7406\u6709\u9032\u4e00\u6b65\u7684\u9700\u6c42\uff0c\u6216\u662f\u9700\u8981\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u8cc7\u8a0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u5728MySQL\u4e2d\u4fee\u6539\u548c\u522a\u9664\u7d22\u5f15\uff08DROP INDEX\uff09\uff0c\u63d0\u5347\u8cc7\u6599\u5eab\u6027\u80fd\u8207\u7ba1\u7406\u6548\u7387\u7684\u5be6\u7528\u6559\u7a0b\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-160809","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160809","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=160809"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160809\/revisions"}],"predecessor-version":[{"id":160810,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160809\/revisions\/160810"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=160809"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=160809"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=160809"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}