{"id":20643,"date":"2024-01-02T05:13:23","date_gmt":"2024-01-02T05:13:23","guid":{"rendered":"https:\/\/server.hk\/blog\/20643\/"},"modified":"2024-11-14T10:39:28","modified_gmt":"2024-11-14T02:39:28","slug":"postgresql-command-vacuum","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/20643\/","title":{"rendered":"PostgreSQL \u6307\u4ee4\uff1aVACUUM"},"content":{"rendered":"<h1 id=\"postgresql-command-vacuum-oNFiHkfpEX\">PostgreSQL \u6307\u4ee4\uff1aVACUUM<\/h1>\n<p>PostgreSQL \u662f\u4e00\u500b\u5f37\u5927\u800c\u6d41\u884c\u7684\u958b\u6e90\u95dc\u806f\u5f0f\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71 (RDBMS)\uff0c\u4ee5\u5176\u7a69\u5b9a\u6027\u3001\u53ef\u64f4\u5c55\u6027\u548c\u64f4\u5c55\u6027\u800c\u805e\u540d\u3002\u5728 PostgreSQL \u4e2d\uff0c\u4e00\u500b\u91cd\u8981\u7684\u6307\u4ee4\u662f VACUUM\uff0c\u5b83\u5728\u7dad\u8b77\u6578\u64da\u5eab\u7684\u6027\u80fd\u548c\u5b8c\u6574\u6027\u65b9\u9762\u626e\u6f14\u8457\u95dc\u9375\u89d2\u8272\u3002<\/p>\n<h2 id=\"what-is-vacuum-oNFiHkfpEX\">\u4ec0\u9ebc\u662f VACUUM?<\/h2>\n<p>VACUUM \u662f\u4e00\u500b PostgreSQL \u6307\u4ee4\uff0c\u7528\u65bc\u56de\u6536\u5b58\u5132\u7a7a\u9593\u4e26\u901a\u904e\u79fb\u9664\u904e\u6642\u6216\u7121\u6548\u7684\u6578\u64da\u4f86\u63d0\u9ad8\u6027\u80fd\u3002\u7576\u6578\u64da\u5728 PostgreSQL \u4e2d\u88ab\u66f4\u65b0\u6216\u522a\u9664\u6642\uff0c\u820a\u7248\u672c\u7684\u6578\u64da\u4e0d\u6703\u7acb\u5373\u88ab\u79fb\u9664\u3002\u76f8\u53cd\uff0c\u5b83\u5011\u6703\u88ab\u6a19\u8a18\u70ba\u6b7b\u4ea1\u5143\u7d44\uff0c\u4e26\u4fdd\u7559\u5728\u6578\u64da\u5eab\u4e2d\uff0c\u76f4\u5230\u57f7\u884c VACUUM \u64cd\u4f5c\u3002<\/p>\n<p>\u5728\u6b63\u5e38\u7684\u6578\u64da\u5eab\u64cd\u4f5c\u904e\u7a0b\u4e2d\uff0c\u6b7b\u4ea1\u5143\u7d44\u6703\u4e0d\u65b7\u7d2f\u7a4d\uff0c\u5c0e\u81f4\u5b58\u5132\u4f7f\u7528\u91cf\u589e\u52a0\u548c\u6027\u80fd\u4e0b\u964d\u3002VACUUM \u900f\u904e\u8b58\u5225\u4e26\u79fb\u9664\u9019\u4e9b\u6b7b\u4ea1\u5143\u7d44\u4f86\u5e6b\u52a9\u89e3\u6c7a\u9019\u500b\u554f\u984c\uff0c\u4f7f\u7a7a\u9593\u80fd\u5920\u88ab\u91cd\u65b0\u5229\u7528\u3002<\/p>\n<h2 id=\"types-of-vacuum-oNFiHkfpEX\">VACUUM \u7684\u985e\u578b<\/h2>\n<p>PostgreSQL \u63d0\u4f9b\u4e86\u4e0d\u540c\u985e\u578b\u7684 VACUUM \u64cd\u4f5c\uff0c\u4ee5\u6eff\u8db3\u5404\u7a2e\u9700\u6c42\uff1a<\/p>\n<h3 id=\"1-vacuum-oNFiHkfpEX\">1. VACUUM<\/h3>\n<p>\u57fa\u672c\u7684 VACUUM \u6307\u4ee4\u57f7\u884c\u79fb\u9664\u6b7b\u4ea1\u5143\u7d44\u548c\u66f4\u65b0\u53ef\u898b\u6027\u5730\u5716\u7684\u57fa\u672c\u4efb\u52d9\u3002\u5b83\u9084\u56de\u6536\u88ab\u522a\u9664\u6216\u66f4\u65b0\u884c\u6240\u4f54\u7528\u7684\u7a7a\u9593\uff0c\u4e26\u66f4\u65b0\u67e5\u8a62\u898f\u5283\u5668\u4f7f\u7528\u7684\u7d71\u8a08\u6578\u64da\u3002VACUUM \u6307\u4ee4\u53ef\u4ee5\u5728\u55ae\u7368\u7684\u8868\u6216\u6574\u500b\u6578\u64da\u5eab\u4e0a\u57f7\u884c\u3002<\/p>\n<h3 id=\"2-vacuum-full-oNFiHkfpEX\">2. VACUUM FULL<\/h3>\n<p>VACUUM FULL \u662f VACUUM \u6307\u4ee4\u7684\u4e00\u500b\u66f4\u6fc0\u9032\u7684\u8b8a\u9ad4\u3002\u5b83\u901a\u904e\u91cd\u5beb\u6574\u500b\u8868\u4f86\u66f4\u6709\u6548\u5730\u56de\u6536\u7a7a\u9593\uff0c\u6d88\u9664\u53ef\u80fd\u5df2\u767c\u751f\u7684\u5167\u90e8\u788e\u7247\u3002\u7136\u800c\uff0cVACUUM FULL \u9700\u8981\u5c0d\u8868\u9032\u884c\u7368\u5360\u9396\u5b9a\uff0c\u56e0\u6b64\u5728\u7e41\u5fd9\u7684\u751f\u7522\u74b0\u5883\u4e2d\u4e0d\u592a\u9069\u7528\u3002<\/p>\n<h3 id=\"3-analyze-oNFiHkfpEX\">3. ANALYZE<\/h3>\n<p>ANALYZE \u662f\u8207 VACUUM \u914d\u5408\u4f7f\u7528\u7684\u547d\u4ee4\uff0c\u7528\u65bc\u66f4\u65b0\u67e5\u8a62\u898f\u5283\u5668\u4f7f\u7528\u7684\u7d71\u8a08\u6578\u64da\u3002\u5b83\u6536\u96c6\u6709\u95dc\u8868\u4e2d\u6578\u64da\u5206\u4f48\u7684\u4fe1\u606f\uff0c\u4f7f\u67e5\u8a62\u898f\u5283\u5668\u80fd\u5920\u751f\u6210\u9ad8\u6548\u7684\u57f7\u884c\u8a08\u5283\u3002\u5b9a\u671f\u904b\u884c ANALYZE\uff0c\u53ef\u4ee5\u78ba\u4fdd\u67e5\u8a62\u898f\u5283\u5668\u64c1\u6709\u6e96\u78ba\u4e14\u6700\u65b0\u7684\u7d71\u8a08\u6578\u64da\u3002<\/p>\n<h2 id=\"when-to-use-vacuum-oNFiHkfpEX\">\u4f55\u6642\u4f7f\u7528 VACUUM?<\/h2>\n<p>\u5b9a\u671f\u904b\u884c VACUUM \u5c0d\u65bc\u7dad\u8b77 PostgreSQL \u6578\u64da\u5eab\u7684\u6027\u80fd\u548c\u5b8c\u6574\u6027\u81f3\u95dc\u91cd\u8981\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u61c9\u8003\u616e\u4f7f\u7528 VACUUM \u7684\u60c5\u6cc1\uff1a<\/p>\n<ul>\n<li>\u5728\u767c\u751f\u5927\u91cf\u6578\u64da\u4fee\u6539\uff08\u63d2\u5165\u3001\u66f4\u65b0\u6216\u522a\u9664\uff09\u5f8c<\/li>\n<li>\u7576\u6578\u64da\u5eab\u9ad4\u9a57\u5230\u6027\u80fd\u4e0b\u964d\u6642<\/li>\n<li>\u5728\u5927\u91cf\u6578\u64da\u5c0e\u5165\u6216\u522a\u9664\u5f8c<\/li>\n<li>\u7576\u78c1\u789f\u7a7a\u9593\u4f7f\u7528\u91cf\u9ad8\u65bc\u9810\u671f\u6642<\/li>\n<\/ul>\n<h2 id=\"conclusion-oNFiHkfpEX\">\u7d50\u8ad6<\/h2>\n<p>VACUUM \u662f PostgreSQL \u4e2d\u4e00\u500b\u95dc\u9375\u7684\u6307\u4ee4\uff0c\u6709\u52a9\u65bc\u7dad\u8b77\u6578\u64da\u5eab\u7684\u6027\u80fd\u548c\u5b8c\u6574\u6027\u3002\u901a\u904e\u79fb\u9664\u6b7b\u4ea1\u5143\u7d44\u548c\u56de\u6536\u5b58\u5132\u7a7a\u9593\uff0cVACUUM \u78ba\u4fdd\u9ad8\u6548\u7684\u6578\u64da\u5b58\u5132\u548c\u6aa2\u7d22\u3002\u5b9a\u671f\u904b\u884c VACUUM \u8207 ANALYZE \u7d50\u5408\u4f7f\u7528\u5c0d\u65bc\u6700\u4f73\u7684 PostgreSQL \u6578\u64da\u5eab\u6027\u80fd\u81f3\u95dc\u91cd\u8981\u3002<\/p>\n<h2 id=\"summary-oNFiHkfpEX\">\u7e3d\u7d50<\/h2>\n<p>\u5728 PostgreSQL \u7684\u4e16\u754c\u4e2d\uff0cVACUUM \u6307\u4ee4\u5728\u7dad\u8b77\u6578\u64da\u5eab\u7684\u6027\u80fd\u548c\u5b8c\u6574\u6027\u65b9\u9762\u626e\u6f14\u8457\u81f3\u95dc\u91cd\u8981\u7684\u89d2\u8272\u3002\u901a\u904e\u79fb\u9664\u6b7b\u4ea1\u5143\u7d44\u548c\u56de\u6536\u5b58\u5132\u7a7a\u9593\uff0cVACUUM \u78ba\u4fdd\u9ad8\u6548\u7684\u6578\u64da\u5b58\u5132\u548c\u6aa2\u7d22\u3002\u8981\u512a\u5316\u60a8\u7684 PostgreSQL \u6578\u64da\u5eab\uff0c\u5b9a\u671f\u904b\u884c VACUUM \u5c24\u70ba\u91cd\u8981\uff0c\u7279\u5225\u662f\u5728\u91cd\u5927\u6578\u64da\u4fee\u6539\u5f8c\u6216\u9047\u5230\u6027\u80fd\u4e0b\u964d\u6642\u3002\u5c0d\u65bc\u53ef\u9760\u4e14\u9ad8\u6548\u7684 VPS \u8a17\u7ba1\u89e3\u6c7a\u65b9\u6848\uff0c\u8acb\u8003\u616e <a href=\"https:\/\/server.hk\">Server.HK<\/a>\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>PostgreSQL \u6307\u4ee4\uff1aVA&#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-20643","post","type-post","status-publish","format-standard","hentry","category-setup-tutorials"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20643","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=20643"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20643\/revisions"}],"predecessor-version":[{"id":24369,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/20643\/revisions\/24369"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=20643"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=20643"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=20643"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}