{"id":20644,"date":"2024-01-02T05:14:21","date_gmt":"2024-01-02T05:14:21","guid":{"rendered":"https:\/\/server.hk\/blog\/20644\/"},"modified":"2024-11-14T10:39:27","modified_gmt":"2024-11-14T02:39:27","slug":"postgresql-command-analyze","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/20644\/","title":{"rendered":"PostgreSQL \u6307\u4ee4\uff1aANALYZE"},"content":{"rendered":"<h1 id=\"postgresql-command-analyze-qXaeCGrtDJ\">PostgreSQL \u6307\u4ee4\uff1aANALYZE<\/h1>\n<p>PostgreSQL \u662f\u4e00\u500b\u529f\u80fd\u5f37\u5927\u7684\u958b\u6e90\u95dc\u806f\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\uff08RDBMS\uff09\uff0c\u4ee5\u5176\u7a69\u5b9a\u6027\u3001\u53ef\u64f4\u5c55\u6027\u548c\u53ef\u64f4\u5c55\u6027\u800c\u805e\u540d\u3002\u5b83\u63d0\u4f9b\u4e86\u5ee3\u6cdb\u7684\u529f\u80fd\u548c\u6307\u4ee4\u4f86\u512a\u5316\u8cc7\u6599\u5eab\u6027\u80fd\uff0c\u5176\u4e2d\u4e00\u500b\u6307\u4ee4\u5c31\u662f ANALYZE\u3002<\/p>\n<h2 id=\"what-is-analyze-qXaeCGrtDJ\">\u4ec0\u9ebc\u662f ANALYZE\uff1f<\/h2>\n<p>ANALYZE \u662f\u4e00\u500b\u7528\u65bc\u6536\u96c6\u8cc7\u6599\u5eab\u4e2d\u8868\u683c\u548c\u7d22\u5f15\u7d71\u8a08\u4fe1\u606f\u7684 PostgreSQL \u6307\u4ee4\u3002\u9019\u4e9b\u7d71\u8a08\u4fe1\u606f\u5c0d\u65bc\u67e5\u8a62\u898f\u5283\u5668\u4f86\u8aaa\u81f3\u95dc\u91cd\u8981\uff0c\u4f7f\u5176\u80fd\u5920\u5c0d\u67e5\u8a62\u7684\u6700\u6709\u6548\u57f7\u884c\u8a08\u5283\u505a\u51fa\u660e\u667a\u7684\u6c7a\u7b56\u3002<\/p>\n<p>\u7576\u5275\u5efa\u6216\u4fee\u6539\u8868\u683c\u6642\uff0cPostgreSQL \u6703\u81ea\u52d5\u6536\u96c6\u4e00\u4e9b\u6709\u95dc\u8868\u683c\u6578\u64da\u5206\u4f48\u7684\u57fa\u672c\u7d71\u8a08\u4fe1\u606f\u3002\u7136\u800c\uff0c\u9019\u4e9b\u7d71\u8a08\u4fe1\u606f\u53ef\u80fd\u6703\u56e0\u6578\u64da\u4fee\u6539\u800c\u96a8\u6642\u9593\u8b8a\u5f97\u904e\u6642\uff0c\u9019\u5c31\u662f ANALYZE \u6307\u4ee4\u767c\u63ee\u4f5c\u7528\u7684\u5730\u65b9\u3002<\/p>\n<h2 id=\"how-does-analyze-work-qXaeCGrtDJ\">ANALYZE \u5982\u4f55\u904b\u4f5c\uff1f<\/h2>\n<p>\u7576\u60a8\u5728\u4e00\u500b\u8868\u683c\u4e0a\u904b\u884c ANALYZE \u6307\u4ee4\u6642\uff0cPostgreSQL \u6703\u6aa2\u67e5\u6578\u64da\u5206\u4f48\u4e26\u76f8\u61c9\u5730\u66f4\u65b0\u7d71\u8a08\u4fe1\u606f\u3002\u5b83\u6536\u96c6\u7684\u4fe1\u606f\u5305\u62ec\u884c\u6578\u3001\u6bcf\u5217\u7684\u6700\u5c0f\u503c\u548c\u6700\u5927\u503c\uff0c\u4ee5\u53ca\u6bcf\u5217\u4e2d\u503c\u7684\u5206\u4f48\u3002<\/p>\n<p>PostgreSQL \u4f7f\u7528\u9019\u4e9b\u7d71\u8a08\u4fe1\u606f\u4f86\u4f30\u7b97\u67e5\u8a62\u4e2d\u5404\u7a2e\u689d\u4ef6\u7684\u9078\u64c7\u6027\u3002\u4f8b\u5982\uff0c\u5982\u679c\u67e5\u8a62\u5305\u542b\u4e00\u500b\u689d\u4ef6\u70ba &#8220;age &gt; 30&#8221; \u7684 WHERE \u5b50\u53e5\uff0c\u67e5\u8a62\u898f\u5283\u5668\u53ef\u4ee5\u5229\u7528\u9019\u4e9b\u7d71\u8a08\u4fe1\u606f\u4f86\u4f30\u7b97\u6eff\u8db3\u8a72\u689d\u4ef6\u7684\u884c\u6578\uff0c\u4e26\u76f8\u61c9\u5730\u9078\u64c7\u6700\u6709\u6548\u7684\u57f7\u884c\u8a08\u5283\u3002<\/p>\n<h2 id=\"running-analyze-qXaeCGrtDJ\">\u904b\u884c ANALYZE<\/h2>\n<p>\u8981\u5728\u4e00\u500b\u8868\u683c\u4e0a\u904b\u884c ANALYZE \u6307\u4ee4\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>ANALYZE [VERBOSE] [table_name]<\/code><\/pre>\n<p>VERBOSE \u9078\u9805\u63d0\u4f9b\u6709\u95dc\u5206\u6790\u904e\u7a0b\u7684\u66f4\u8a73\u7d30\u8f38\u51fa\uff0c\u5305\u62ec\u5206\u6790\u7684\u9801\u9762\u548c\u5143\u7d44\u6578\u91cf\u3002\u5982\u679c\u60a8\u7701\u7565 table_name\uff0cANALYZE \u5c07\u5728\u7576\u524d\u8cc7\u6599\u5eab\u4e2d\u7684\u6240\u6709\u8868\u683c\u4e0a\u57f7\u884c\u3002<\/p>\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u904b\u884c ANALYZE \u53ef\u80fd\u662f\u4e00\u500b\u8cc7\u6e90\u5bc6\u96c6\u578b\u7684\u64cd\u4f5c\uff0c\u7279\u5225\u662f\u5728\u5927\u578b\u8868\u683c\u4e0a\u3002\u56e0\u6b64\uff0c\u5efa\u8b70\u5728\u8cc7\u6599\u5eab\u6d3b\u52d5\u8f03\u4f4e\u7684\u6642\u6bb5\u5b9a\u671f\u5b89\u6392 ANALYZE \u6307\u4ee4\uff0c\u4ee5\u6e1b\u5c11\u5c0d\u6027\u80fd\u7684\u5f71\u97ff\u3002<\/p>\n<h2 id=\"benefits-of-analyze-qXaeCGrtDJ\">ANALYZE \u7684\u597d\u8655<\/h2>\n<p>ANALYZE \u6307\u4ee4\u70ba PostgreSQL \u8cc7\u6599\u5eab\u7ba1\u7406\u54e1\u548c\u958b\u767c\u8005\u63d0\u4f9b\u4e86\u5e7e\u500b\u597d\u8655\uff1a<\/p>\n<ul>\n<li><strong>\u63d0\u5347\u67e5\u8a62\u6027\u80fd\uff1a<\/strong>\u901a\u904e\u63d0\u4f9b\u6700\u65b0\u7684\u7d71\u8a08\u4fe1\u606f\uff0cANALYZE \u5e6b\u52a9\u67e5\u8a62\u898f\u5283\u5668\u505a\u51fa\u66f4\u597d\u7684\u6c7a\u7b56\uff0c\u5f9e\u800c\u5be6\u73fe\u66f4\u5feb\u548c\u66f4\u9ad8\u6548\u7684\u67e5\u8a62\u57f7\u884c\u3002<\/li>\n<li><strong>\u6e96\u78ba\u7684\u6210\u672c\u4f30\u7b97\uff1a<\/strong>ANALYZE \u6536\u96c6\u7684\u7d71\u8a08\u4fe1\u606f\u4f7f\u67e5\u8a62\u898f\u5283\u5668\u80fd\u5920\u6e96\u78ba\u4f30\u7b97\u4e0d\u540c\u67e5\u8a62\u8a08\u5283\u7684\u6210\u672c\uff0c\u5f9e\u800c\u5c0e\u81f4\u6700\u4f73\u8a08\u5283\u7684\u9078\u64c7\u3002<\/li>\n<li><strong>\u7d22\u5f15\u512a\u5316\uff1a<\/strong>ANALYZE \u4e5f\u6536\u96c6\u6709\u95dc\u7d22\u5f15\u7684\u7d71\u8a08\u4fe1\u606f\uff0c\u4f7f\u67e5\u8a62\u898f\u5283\u5668\u80fd\u5920\u70ba\u7279\u5b9a\u67e5\u8a62\u9078\u64c7\u6700\u5408\u9069\u7684\u7d22\u5f15\u3002<\/li>\n<\/ul>\n<h2 id=\"summary-qXaeCGrtDJ\">\u7e3d\u7d50<\/h2>\n<p>PostgreSQL \u7684 ANALYZE \u6307\u4ee4\u5728\u901a\u904e\u6536\u96c6\u548c\u66f4\u65b0\u6709\u95dc\u8868\u683c\u548c\u7d22\u5f15\u7684\u7d71\u8a08\u4fe1\u606f\u4f86\u512a\u5316\u8cc7\u6599\u5eab\u6027\u80fd\u65b9\u9762\u767c\u63ee\u4e86\u81f3\u95dc\u91cd\u8981\u7684\u4f5c\u7528\u3002\u901a\u904e\u5b9a\u671f\u904b\u884c ANALYZE\uff0c\u8cc7\u6599\u5eab\u7ba1\u7406\u54e1\u53ef\u4ee5\u78ba\u4fdd\u67e5\u8a62\u898f\u5283\u5668\u64c1\u6709\u6e96\u78ba\u7684\u4fe1\u606f\uff0c\u4ee5\u4fbf\u5c0d\u67e5\u8a62\u57f7\u884c\u8a08\u5283\u505a\u51fa\u660e\u667a\u7684\u6c7a\u7b56\u3002<\/p>\n<p>\u5982\u9700\u53ef\u9760\u4e14\u9ad8\u6548\u80fd\u7684 VPS \u4e3b\u6a5f\u89e3\u6c7a\u65b9\u6848\uff0c\u8acb\u8003\u616e <a href=\"https:\/\/server.hk\">Server.HK<\/a>\u3002\u901a\u904e\u6211\u5011\u4e00\u6d41\u7684 VPS \u4e3b\u6a5f\u670d\u52d9\uff0c\u60a8\u53ef\u4ee5\u9ad4\u9a57 PostgreSQL \u548c\u5176\u4ed6\u9818\u5148\u6280\u8853\u7684\u5f37\u5927\u548c\u9748\u6d3b\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>PostgreSQL \u6307\u4ee4\uff1aAN&#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-20644","post","type-post","status-publish","format-standard","hentry","category-setup-tutorials"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20644","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=20644"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20644\/revisions"}],"predecessor-version":[{"id":24368,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20644\/revisions\/24368"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=20644"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=20644"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=20644"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}