{"id":20345,"date":"2024-01-02T04:38:24","date_gmt":"2024-01-02T04:38:24","guid":{"rendered":"https:\/\/server.hk\/blog\/20345\/"},"modified":"2024-11-14T10:40:04","modified_gmt":"2024-11-14T02:40:04","slug":"postgresql-command-create-index","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/20345\/","title":{"rendered":"PostgreSQL \u547d\u4ee4\uff1aCREATE INDEX"},"content":{"rendered":"<h1 id=\"postgresql-command-create-index-CkCYSvSxRL\">PostgreSQL \u547d\u4ee4\uff1aCREATE 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\u5ee3\u6cdb\u7684\u529f\u80fd\u8207\u80fd\u529b\u3002\u5176\u4e2d\u4e00\u500b\u91cd\u8981\u7684\u547d\u4ee4\u662f <code>CREATE INDEX<\/code>\uff0c\u6b64\u547d\u4ee4\u5141\u8a31\u7528\u6236\u5728\u6578\u64da\u5eab\u8868\u4e0a\u5275\u5efa\u7d22\u5f15\uff0c\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002<\/p>\n<h2 id=\"what-is-an-index-CkCYSvSxRL\">\u4ec0\u9ebc\u662f\u7d22\u5f15\uff1f<\/h2>\n<p>\u7d22\u5f15\u662f\u4e00\u7a2e\u6578\u64da\u7d50\u69cb\uff0c\u7528\u65bc\u52a0\u5feb\u6578\u64da\u5eab\u8868\u4e2d\u7684\u6578\u64da\u6aa2\u7d22\u64cd\u4f5c\u3002\u5b83\u985e\u4f3c\u65bc\u66f8\u672c\u4e2d\u7684\u7d22\u5f15\uff0c\u4f7f\u60a8\u53ef\u4ee5\u5feb\u901f\u627e\u5230\u7279\u5b9a\u7684\u4fe1\u606f\uff0c\u800c\u7121\u9700\u6383\u63cf\u6574\u500b\u8868\u3002\u5728 PostgreSQL \u4e2d\uff0c\u7d22\u5f15\u53ef\u4ee5\u5728\u8868\u7684\u4e00\u500b\u6216\u591a\u500b\u6b04\u4f4d\u4e0a\u5275\u5efa\uff0c\u4e26\u5b58\u5132\u9019\u4e9b\u6b04\u4f4d\u6578\u64da\u7684\u6392\u5e8f\u526f\u672c\u3002<\/p>\n<h2 id=\"why-use-indexes-CkCYSvSxRL\">\u70ba\u4ec0\u9ebc\u4f7f\u7528\u7d22\u5f15\uff1f<\/h2>\n<p>\u7d22\u5f15\u5728\u512a\u5316\u67e5\u8a62\u6027\u80fd\u65b9\u9762\u8d77\u8457\u95dc\u9375\u4f5c\u7528\u3002\u901a\u904e\u5728\u7d93\u5e38\u67e5\u8a62\u7684\u6b04\u4f4d\u4e0a\u5275\u5efa\u7d22\u5f15\uff0c\u60a8\u53ef\u4ee5\u986f\u8457\u6e1b\u5c11\u5f9e\u8868\u4e2d\u6aa2\u7d22\u6578\u64da\u6240\u9700\u7684\u6642\u9593\u3002\u7576\u57f7\u884c\u67e5\u8a62\u6642\uff0cPostgreSQL \u53ef\u4ee5\u4f7f\u7528\u7d22\u5f15\u66f4\u6709\u6548\u5730\u5b9a\u4f4d\u76f8\u95dc\u6578\u64da\uff0c\u5f9e\u800c\u52a0\u5feb\u97ff\u61c9\u901f\u5ea6\u3002<\/p>\n<p>\u5982\u679c\u6c92\u6709\u7d22\u5f15\uff0cPostgreSQL \u5c07\u9700\u8981\u5c0d\u6574\u500b\u8868\u9032\u884c\u9806\u5e8f\u6383\u63cf\u4f86\u67e5\u627e\u6240\u9700\u6578\u64da\uff0c\u9019\u5c0d\u65bc\u5927\u578b\u8868\u4f86\u8aaa\u53ef\u80fd\u975e\u5e38\u8017\u6642\u3002<\/p>\n<h2 id=\"creating-an-index-with-create-index-CkCYSvSxRL\">\u4f7f\u7528 CREATE INDEX \u5275\u5efa\u7d22\u5f15<\/h2>\n<p>PostgreSQL \u4e2d\u7684 <code>CREATE INDEX<\/code> \u547d\u4ee4\u5141\u8a31\u60a8\u5728\u8868\u7684\u4e00\u500b\u6216\u591a\u500b\u6b04\u4f4d\u4e0a\u5275\u5efa\u7d22\u5f15\u3002\u8a72\u547d\u4ee4\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>CREATE INDEX index_name\r\nON table_name (column1, column2, ...);\r\n<\/code><\/pre>\n<p>\u5176\u4e2d\uff0c<code>index_name<\/code> \u662f\u60a8\u60f3\u8981\u7d66\u7d22\u5f15\u8d77\u7684\u540d\u7a31\uff0c<code>table_name<\/code> \u662f\u60a8\u60f3\u5275\u5efa\u7d22\u5f15\u7684\u8868\u540d\u7a31\u3002\u60a8\u53ef\u4ee5\u5728\u62ec\u865f\u5167\u6307\u5b9a\u4e00\u500b\u6216\u591a\u500b\u6b04\u4f4d\uff0c\u8868\u660e\u61c9\u5728\u54ea\u4e9b\u6b04\u4f4d\u4e0a\u5275\u5efa\u7d22\u5f15\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>customers<\/code> \u7684\u8868\uff0c\u8a72\u8868\u5305\u542b <code>customer_id<\/code>\u3001<code>first_name<\/code> \u548c <code>last_name<\/code> \u6b04\u4f4d\u3002\u8981\u5728 <code>last_name<\/code> \u6b04\u4f4d\u4e0a\u5275\u5efa\u7d22\u5f15\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/p>\n<pre><code>CREATE INDEX idx_last_name\r\nON customers (last_name);\r\n<\/code><\/pre>\n<p>\u6b64\u547d\u4ee4\u5728 <code>customers<\/code> \u8868\u7684 <code>last_name<\/code> \u6b04\u4f4d\u4e0a\u5275\u5efa\u4e86\u4e00\u500b\u540d\u70ba <code>idx_last_name<\/code> \u7684\u7d22\u5f15\u3002<\/p>\n<h2 id=\"types-of-indexes-CkCYSvSxRL\">\u7d22\u5f15\u985e\u578b<\/h2>\n<p>PostgreSQL \u652f\u6301\u591a\u7a2e\u985e\u578b\u7684\u7d22\u5f15\uff0c\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>B-tree \u7d22\u5f15\uff1a<\/strong>\u9019\u662f PostgreSQL \u7684\u9ed8\u8a8d\u7d22\u5f15\u985e\u578b\uff0c\u9069\u7528\u65bc\u5927\u591a\u6578\u60c5\u6cc1\uff0c\u5c24\u5176\u662f\u7b49\u503c\u67e5\u8a62\u548c\u7bc4\u570d\u67e5\u8a62\u3002<\/li>\n<li><strong>\u54c8\u5e0c\u7d22\u5f15\uff1a<\/strong>\u9019\u7a2e\u7d22\u5f15\u5c0d\u7b49\u503c\u67e5\u8a62\u6709\u7528\uff0c\u4f46\u4e0d\u9069\u7528\u65bc\u7bc4\u570d\u67e5\u8a62\u3002<\/li>\n<li><strong>GIN\uff08\u901a\u7528\u5012\u6392\u7d22\u5f15\uff09\uff1a<\/strong>GIN \u7d22\u5f15\u9069\u7528\u65bc\u8907\u96dc\u7684\u6578\u64da\u985e\u578b\uff0c\u5982\u6578\u7d44\u548c\u5168\u6587\u641c\u7d22\u3002<\/li>\n<li><strong>GiST\uff08\u901a\u7528\u641c\u7d22\u6a39\uff09\uff1a<\/strong>GiST \u7d22\u5f15\u9069\u7528\u65bc\u5275\u5efa\u81ea\u5b9a\u7fa9\u7d22\u5f15\u985e\u578b\u4e26\u652f\u6301\u8907\u96dc\u67e5\u8a62\u3002<\/li>\n<li><strong>SP-GiST\uff08\u7a7a\u9593\u5206\u5272\u901a\u7528\u641c\u7d22\u6a39\uff09\uff1a<\/strong>SP-GiST \u7d22\u5f15\u7528\u65bc\u591a\u7dad\u6578\u64da\u3002<\/li>\n<li><strong>BRIN\uff08\u584a\u7bc4\u570d\u7d22\u5f15\uff09\uff1a<\/strong>BRIN \u7d22\u5f15\u7528\u65bc\u5177\u6709\u6392\u5e8f\u6578\u64da\u7684\u5927\u578b\u8868\u3002<\/li>\n<\/ul>\n<p>\u5728\u5275\u5efa\u7d22\u5f15\u6642\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528 <code>USING<\/code> \u5b50\u53e5\u4f86\u6307\u5b9a\u7d22\u5f15\u985e\u578b\u3002\u5982\u679c\u672a\u6307\u5b9a\u985e\u578b\uff0cPostgreSQL \u5c07\u9ed8\u8a8d\u4f7f\u7528 B-tree \u7d22\u5f15\u3002<\/p>\n<h2 id=\"conclusion-CkCYSvSxRL\">\u7d50\u8ad6<\/h2>\n<p>PostgreSQL \u4e2d\u7684 <code>CREATE INDEX<\/code> \u547d\u4ee4\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u7528\u65bc\u512a\u5316\u67e5\u8a62\u6027\u80fd\u3002\u901a\u904e\u5728\u7d93\u5e38\u67e5\u8a62\u7684\u6b04\u4f4d\u4e0a\u5275\u5efa\u7d22\u5f15\uff0c\u60a8\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u6578\u64da\u6aa2\u7d22\u64cd\u4f5c\u7684\u901f\u5ea6\u3002\u4e86\u89e3\u5982\u4f55\u6709\u6548\u4f7f\u7528\u7d22\u5f15\u5c07\u6709\u52a9\u65bc\u6700\u5927\u5316\u60a8\u7684 PostgreSQL \u6578\u64da\u5eab\u6027\u80fd\u3002<\/p>\n<h2 id=\"summary-CkCYSvSxRL\">\u7e3d\u7d50<\/h2>\n<p>\u7e3d\u4e4b\uff0cPostgreSQL \u4e2d\u7684 <code>CREATE INDEX<\/code> \u547d\u4ee4\u5141\u8a31\u60a8\u5728\u6578\u64da\u5eab\u8868\u4e0a\u5275\u5efa\u7d22\u5f15\uff0c\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u7d22\u5f15\u662f\u901a\u904e\u5728\u7279\u5b9a\u6b04\u4f4d\u4e2d\u5b58\u5132\u6392\u5e8f\u526f\u672c\u4f86\u52a0\u901f\u6578\u64da\u6aa2\u7d22\u64cd\u4f5c\u7684\u6578\u64da\u7d50\u69cb\u3002\u901a\u904e\u5728\u7d93\u5e38\u67e5\u8a62\u7684\u6b04\u4f4d\u4e0a\u5275\u5efa\u7d22\u5f15\uff0c\u60a8\u53ef\u4ee5\u6e1b\u5c11\u5f9e\u8868\u4e2d\u6aa2\u7d22\u6578\u64da\u6240\u9700\u7684\u6642\u9593\u3002PostgreSQL \u652f\u6301\u591a\u7a2e\u7d22\u5f15\u985e\u578b\uff0c\u5305\u62ec B-tree\u3001\u54c8\u5e0c\u3001GIN\u3001GiST\u3001SP-GiST \u548c BRIN\u3002\u4e86\u89e3\u5982\u4f55\u6709\u6548\u5730\u4f7f\u7528\u7d22\u5f15\uff0c\u53ef\u4ee5\u6975\u5927\u5730\u512a\u5316\u60a8\u7684 PostgreSQL \u6578\u64da\u5eab\u6027\u80fd\u3002<\/p>\n<p>\u5982\u9700\u66f4\u591a\u6709\u95dc VPS \u4e3b\u6a5f\u89e3\u6c7a\u65b9\u6848\u7684\u8cc7\u8a0a\uff0c\u8acb\u8a2a\u554f <a href=\"https:\/\/server.hk\">Server.HK<\/a>\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>PostgreSQL \u547d\u4ee4\uff1aCR&#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-20345","post","type-post","status-publish","format-standard","hentry","category-setup-tutorials"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20345","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=20345"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20345\/revisions"}],"predecessor-version":[{"id":24416,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20345\/revisions\/24416"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=20345"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=20345"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=20345"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}