{"id":20346,"date":"2024-01-02T04:39:20","date_gmt":"2024-01-02T04:39:20","guid":{"rendered":"https:\/\/server.hk\/blog\/20346\/"},"modified":"2024-11-14T10:40:02","modified_gmt":"2024-11-14T02:40:02","slug":"postgresql-command-drop-index","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/20346\/","title":{"rendered":"PostgreSQL \u6307\u4ee4\uff1aDROP INDEX"},"content":{"rendered":"<h1 id=\"postgresql-command-drop-index-OhwPYkfLDs\">PostgreSQL \u6307\u4ee4\uff1aDROP INDEX<\/h1>\n<p>PostgreSQL \u662f\u4e00\u500b\u529f\u80fd\u5f37\u5927\u7684\u958b\u6e90\u95dc\u806f\u5f0f\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u591a\u7a2e\u7279\u6027\u548c\u529f\u80fd\u3002\u5728 PostgreSQL \u4e2d\uff0c\u4e00\u500b\u57fa\u672c\u7684\u6307\u4ee4\u662f DROP INDEX \u6307\u4ee4\uff0c\u5b83\u5141\u8a31\u7528\u6236\u5f9e\u8868\u683c\u4e2d\u522a\u9664\u73fe\u6709\u7684 index\uff08\u7d22\u5f15\uff09\u3002\u5728\u672c\u6587\u4e2d\uff0c\u6211\u5011\u5c07\u8a73\u7d30\u63a2\u8a0e DROP INDEX \u6307\u4ee4\uff0c\u4e86\u89e3\u5176\u4f7f\u7528\u65b9\u5f0f\u548c\u5f71\u97ff\u3002<\/p>\n<h2 id=\"understanding-indexes-in-postgresql-OhwPYkfLDs\">\u4e86\u89e3 PostgreSQL \u4e2d\u7684\u7d22\u5f15<\/h2>\n<p>\u5728\u6df1\u5165\u63a2\u8a0e DROP INDEX \u6307\u4ee4\u4e4b\u524d\uff0c\u8b93\u6211\u5011\u7c21\u8981\u4e86\u89e3\u5728 PostgreSQL \u4e0a\uff0c\u7d22\u5f15\u662f\u4ec0\u9ebc\u3002\u7d22\u5f15\u662f\u4e00\u7a2e\u8cc7\u6599\u7d50\u69cb\uff0c\u5b83\u80fd\u5920\u52a0\u5feb\u6578\u64da\u6aa2\u7d22\u64cd\u4f5c\u7684\u901f\u5ea6\u3002\u5b83\u7684\u4f5c\u7528\u985e\u4f3c\u65bc\u66f8\u4e2d\u7684\u7d22\u5f15\uff0c\u5141\u8a31\u6578\u64da\u5eab\u5feb\u901f\u5b9a\u4f4d\u6240\u9700\u7684\u8cc7\u6599\uff0c\u800c\u4e0d\u9700\u8981\u6383\u63cf\u6574\u500b\u8868\u683c\u3002<\/p>\n<p>\u7d22\u5f15\u662f\u5275\u5efa\u5728\u8868\u683c\u7684\u4e00\u500b\u6216\u591a\u500b\u6b04\u4f4d\u4e0a\uff0c\u5b83\u5b58\u5132\u4e86\u8cc7\u6599\u503c\u7684\u6392\u5e8f\u526f\u672c\uff0c\u4ee5\u53ca\u6307\u5411\u5be6\u969b\u8cc7\u6599\u7684\u6307\u91dd\u3002\u9019\u500b\u6392\u5e8f\u526f\u672c\u80fd\u5920\u5be6\u73fe\u5c0d\u8868\u683c\u7684\u6709\u6548\u641c\u7d22\u3001\u6392\u5e8f\u548c\u904e\u6ffe\u64cd\u4f5c\u3002<\/p>\n<h2 id=\"the-drop-index-command-syntax-OhwPYkfLDs\">DROP INDEX \u6307\u4ee4\u8a9e\u6cd5<\/h2>\n<p>DROP INDEX \u6307\u4ee4\u9075\u5faa\u4e00\u500b\u7c21\u55ae\u7684\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>DROP INDEX [IF EXISTS] index_name;\r\n<\/code><\/pre>\n<p>\u8b93\u6211\u5011\u4f86\u5206\u89e3\u9019\u500b\u8a9e\u6cd5\uff1a<\/p>\n<ul>\n<li><code>DROP INDEX<\/code>\uff1a\u9019\u662f\u522a\u9664\u7d22\u5f15\u7684\u4e3b\u8981\u6307\u4ee4\u3002<\/li>\n<li><code>IF EXISTS<\/code>\uff08\u53ef\u9078\u7684\uff09\uff1a\u6b64\u5b50\u53e5\u5141\u8a31\u6307\u4ee4\u5728\u7d22\u5f15\u4e0d\u5b58\u5728\u6642\u6210\u529f\u57f7\u884c\uff0c\u907f\u514d\u5f15\u767c\u932f\u8aa4\u3002<\/li>\n<li><code>index_name<\/code>\uff1a\u9019\u662f\u60a8\u60f3\u8981\u522a\u9664\u7684\u7d22\u5f15\u7684\u540d\u7a31\u3002<\/li>\n<\/ul>\n<h2 id=\"examples-of-using-drop-index-OhwPYkfLDs\">\u4f7f\u7528 DROP INDEX \u7684\u793a\u4f8b<\/h2>\n<p>\u73fe\u5728\uff0c\u8b93\u6211\u5011\u770b\u5e7e\u500b\u793a\u4f8b\uff0c\u4e86\u89e3\u5982\u4f55\u5728\u4e0d\u540c\u60c5\u6cc1\u4e0b\u4f7f\u7528 DROP INDEX \u6307\u4ee4\u3002<\/p>\n<h3 id=\"example-1-dropping-an-index-OhwPYkfLDs\">\u793a\u4f8b 1\uff1a\u522a\u9664\u4e00\u500b\u7d22\u5f15<\/h3>\n<p>\u8981\u522a\u9664\u4e00\u500b\u7d22\u5f15\uff0c\u60a8\u9700\u8981\u5728 <code>DROP INDEX<\/code> \u6307\u4ee4\u5f8c\u6307\u5b9a\u7d22\u5f15\u540d\u7a31\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>DROP INDEX index_name;\r\n<\/code><\/pre>\n<p>\u5c07 <code>index_name<\/code> \u66ff\u63db\u70ba\u60a8\u60f3\u8981\u522a\u9664\u7684\u7d22\u5f15\u7684\u5be6\u969b\u540d\u7a31\u3002\u5982\u679c\u7d22\u5f15\u5b58\u5728\uff0c\u5b83\u5c07\u5f9e\u8868\u683c\u4e2d\u522a\u9664\u3002<\/p>\n<h3 id=\"example-2-dropping-an-index-if-it-exists-OhwPYkfLDs\">\u793a\u4f8b 2\uff1a\u5982\u679c\u5b58\u5728\u5247\u522a\u9664\u4e00\u500b\u7d22\u5f15<\/h3>\n<p>\u5982\u679c\u60a8\u4e0d\u78ba\u5b9a\u7d22\u5f15\u662f\u5426\u5b58\u5728\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528 <code>IF EXISTS<\/code> \u5b50\u53e5\u4f86\u907f\u514d\u4efb\u4f55\u932f\u8aa4\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>DROP INDEX IF EXISTS index_name;\r\n<\/code><\/pre>\n<p>\u9019\u500b\u6307\u4ee4\u5c07\u5728\u7d22\u5f15\u5b58\u5728\u6642\u522a\u9664\u5b83\u3002\u5982\u679c\u7d22\u5f15\u4e0d\u5b58\u5728\uff0c\u6b64\u6307\u4ee4\u5c07\u6210\u529f\u57f7\u884c\u800c\u4e0d\u5f15\u767c\u932f\u8aa4\u3002<\/p>\n<h2 id=\"summary-OhwPYkfLDs\">\u6458\u8981<\/h2>\n<p>\u5728 PostgreSQL \u4e2d\uff0cDROP INDEX \u6307\u4ee4\u5141\u8a31\u7528\u6236\u5f9e\u8868\u683c\u4e2d\u522a\u9664\u73fe\u6709\u7684\u7d22\u5f15\u3002\u7d22\u5f15\u5728\u6539\u5584\u6578\u64da\u6aa2\u7d22\u64cd\u4f5c\u7684\u6027\u80fd\u4e2d\u8d77\u8457\u81f3\u95dc\u91cd\u8981\u7684\u4f5c\u7528\uff0c\u800c DROP INDEX \u6307\u4ee4\u63d0\u4f9b\u4e86\u4e00\u7a2e\u4fbf\u6377\u7684\u65b9\u5f0f\u4f86\u6839\u64da\u60a8\u6578\u64da\u5eab\u7684\u9700\u6c42\u7ba1\u7406\u548c\u4fee\u6539\u7d22\u5f15\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u66f4\u591a\u95dc\u65bc VPS \u8a17\u7ba1\u89e3\u6c7a\u65b9\u6848\u7684\u4fe1\u606f\uff0c\u8acb\u8003\u616e\u67e5\u770b <a href=\"https:\/\/server.hk\">Server.HK<\/a>\u3002\u6191\u85c9\u5176\u9802\u7d1a\u7684 VPS \u8a17\u7ba1\u670d\u52d9\uff0c\u60a8\u53ef\u4ee5\u78ba\u4fdd\u70ba\u60a8\u7684 PostgreSQL \u6578\u64da\u5eab\u63d0\u4f9b\u53ef\u9760\u4e14\u9ad8\u6548\u7684\u8a17\u7ba1\u670d\u52d9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>PostgreSQL \u6307\u4ee4\uff1aDR&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4924],"tags":[],"class_list":["post-20346","post","type-post","status-publish","format-standard","hentry","category-setup-tutorials"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20346","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"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=20346"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20346\/revisions"}],"predecessor-version":[{"id":24408,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20346\/revisions\/24408"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=20346"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=20346"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=20346"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}