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class=\"edgeLabel L-LS-C&#039; L-LE-C2\"><\/span><span id=\"L-L-C-C3\" class=\"edgeLabel L-LS-C&#039; L-LE-C3\"><\/span><span id=\"L-L-D-D1\" class=\"edgeLabel L-LS-D&#039; L-LE-D1\"><\/span><span id=\"L-L-D-D2\" class=\"edgeLabel L-LS-D&#039; L-LE-D2\"><\/span><span id=\"L-L-D-D3\" class=\"edgeLabel L-LS-D&#039; L-LE-D3\"><\/span><span id=\"L-L-E-E1\" class=\"edgeLabel L-LS-E&#039; L-LE-E1\"><\/span><span id=\"L-L-E-E2\" class=\"edgeLabel L-LS-E&#039; L-LE-E2\"><\/span><span id=\"L-L-E-E3\" class=\"edgeLabel L-LS-E&#039; L-LE-E3\"><\/span>B-tree\u7d22\u5f15\u5e94\u7528\u573a\u666f\u67e5\u8be2\u6a21\u5f0f\u6570\u636e\u7279\u5f81\u6027\u80fd\u8981\u6c42\u7b49\u503c\u67e5\u8be2WHERE id &#061; 100\u8303\u56f4\u67e5\u8be2WHERE age BETWEEN 25 AND 35\u6392\u5e8f\u67e5\u8be2ORDER BY create_time\u524d\u7f00\u5339\u914dWHERE name LIKE &#039;John%&#039;\u9ad8\u9009\u62e9\u6027\u91cd\u590d\u503c\u5c11\u6709\u5e8f\u9700\u6c42\u9700\u8981\u6392\u5e8f\u8303\u56f4\u67e5\u8be2\u533a\u95f4\u67e5\u627e\u67e5\u8be2\u9891\u7e41\u8bfb\u591a\u5199\u5c11\u54cd\u5e94\u65f6\u95f4\u654f\u611f\u4f4e\u5ef6\u8fdf\u8981\u6c42\u6570\u636e\u4e00\u81f4\u6027\u552f\u4e00\u6027\u7ea6\u675f\u4e0d\u9002\u7528\u573a\u666f\u4f4e\u9009\u62e9\u6027\u91cd\u590d\u503c\u591a\u9891\u7e41\u66f4\u65b0\u7ef4\u62a4\u6210\u672c\u9ad8\u5927\u91cf\u63d2\u5165\u9875\u9762\u5206\u88c2\u9891\u7e41<\/p>\n<h3>&#x1f50d; Hash\u7d22\u5f15\u7279\u6027\u5206\u6790<\/h3>\n<h4>Hash\u7d22\u5f15\u7ed3\u6784\u4e0e\u539f\u7406<\/h4>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250812083024-689afba0ba9a7.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h4>Hash\u7d22\u5f15\u4f7f\u7528\u51b3\u7b56<\/h4>\n<p>#mermaid-svg-NXPUbMQXNNrqWK1m {font-family:\\&#8221;trebuchet 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.cluster-label span{color:#333;}#mermaid-svg-NXPUbMQXNNrqWK1m .label text,#mermaid-svg-NXPUbMQXNNrqWK1m span{fill:#333;color:#333;}#mermaid-svg-NXPUbMQXNNrqWK1m .node rect,#mermaid-svg-NXPUbMQXNNrqWK1m .node circle,#mermaid-svg-NXPUbMQXNNrqWK1m .node ellipse,#mermaid-svg-NXPUbMQXNNrqWK1m .node polygon,#mermaid-svg-NXPUbMQXNNrqWK1m .node path{fill:#ECECFF;stroke:#9370DB;stroke-width:1px;}#mermaid-svg-NXPUbMQXNNrqWK1m .node .label{text-align:center;}#mermaid-svg-NXPUbMQXNNrqWK1m .node.clickable{cursor:pointer;}#mermaid-svg-NXPUbMQXNNrqWK1m .arrowheadPath{fill:#333333;}#mermaid-svg-NXPUbMQXNNrqWK1m .edgePath .path{stroke:#333333;stroke-width:2.0px;}#mermaid-svg-NXPUbMQXNNrqWK1m .flowchart-link{stroke:#333333;fill:none;}#mermaid-svg-NXPUbMQXNNrqWK1m .edgeLabel{background-color:#e8e8e8;text-align:center;}#mermaid-svg-NXPUbMQXNNrqWK1m .edgeLabel rect{opacity:0.5;background-color:#e8e8e8;fill:#e8e8e8;}#mermaid-svg-NXPUbMQXNNrqWK1m .cluster rect{fill:#ffffde;stroke:#aaaa33;stroke-width:1px;}#mermaid-svg-NXPUbMQXNNrqWK1m .cluster text{fill:#333;}#mermaid-svg-NXPUbMQXNNrqWK1m .cluster span{color:#333;}#mermaid-svg-NXPUbMQXNNrqWK1m div.mermaidTooltip{position:absolute;text-align:center;max-width:200px;padding:2px;font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:12px;background:hsl(80, 100%, 96.2745098039%);border:1px solid #aaaa33;border-radius:2px;pointer-events:none;z-index:100;}#mermaid-svg-NXPUbMQXNNrqWK1m :root{&#8211;mermaid-font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;}<span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\">\u4ec5\u7b49\u503c\u67e5\u8be2<\/span><span class=\"edgeLabel\">\u9700\u8981\u8303\u56f4\u67e5\u8be2<\/span><span class=\"edgeLabel\">\u9700\u8981\u6392\u5e8f<\/span><span class=\"edgeLabel\">\u5206\u5e03\u5747\u5300<\/span><span class=\"edgeLabel\">\u5206\u5e03\u503e\u659c<\/span><span class=\"edgeLabel\">\u8bfb\u591a\u5199\u5c11<\/span><span class=\"edgeLabel\">\u5199\u64cd\u4f5c\u9891\u7e41<\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"nodeLabel\">\u9009\u62e9Hash\u7d22\u5f15?<\/span><span class=\"nodeLabel\">\u67e5\u8be2\u6a21\u5f0f<\/span><span class=\"nodeLabel\">\u6570\u636e\u5206\u5e03<\/span><span class=\"nodeLabel\">\u4f7f\u7528B-tree<\/span><span class=\"nodeLabel\">\u66f4\u65b0\u9891\u7387<\/span><span class=\"nodeLabel\">\u8003\u8651B-tree<\/span><span class=\"nodeLabel\">Hash\u7d22\u5f15\u9002\u5408<\/span><span class=\"nodeLabel\">\u8bc4\u4f30\u7ef4\u62a4\u6210\u672c<\/span><span class=\"nodeLabel\">\u6570\u636e\u503e\u659c\u53ef\u80fd\u5bfc\u81f4\u51b2\u7a81\u589e\u52a0<\/span><span class=\"nodeLabel\">\u9891\u7e41\u66f4\u65b0\u53ef\u80fd\u5bfc\u81f4\u6876\u5206\u88c2<\/span><\/p>\n<h3>&#x1f504; GIN\u7d22\u5f15\u6df1\u5ea6\u5e94\u7528<\/h3>\n<h4>GIN\u7d22\u5f15\u67b6\u6784\u539f\u7406<\/h4>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250812083026-689afba25edf9.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h4>GIN\u7d22\u5f15\u67e5\u8be2\u4f18\u5316\u6d41\u7a0b<\/h4>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250812083027-689afba36ba28.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>&#x1f3a8; GiST\u7d22\u5f15\u51e0\u4f55\u5e94\u7528<\/h3>\n<h4>GiST\u7d22\u5f15\u7279\u6027\u67b6\u6784<\/h4>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250812083029-689afba55f044.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h4>\u51e0\u4f55\u67e5\u8be2\u7c7b\u578b<\/h4>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250812083030-689afba6c9d7a.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>&#x1f4e6; BRIN\u7d22\u5f15\u5757\u7ea7\u4f18\u5316<\/h3>\n<h4>BRIN\u7d22\u5f15\u539f\u7406\u7ed3\u6784<\/h4>\n<p>#mermaid-svg-TfRJ9NjjpkvRRLqg {font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;fill:#333;}#mermaid-svg-TfRJ9NjjpkvRRLqg .error-icon{fill:#552222;}#mermaid-svg-TfRJ9NjjpkvRRLqg .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-TfRJ9NjjpkvRRLqg .edge-thickness-normal{stroke-width:2px;}#mermaid-svg-TfRJ9NjjpkvRRLqg .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-TfRJ9NjjpkvRRLqg .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-TfRJ9NjjpkvRRLqg .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-TfRJ9NjjpkvRRLqg .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-TfRJ9NjjpkvRRLqg .marker{fill:#333333;stroke:#333333;}#mermaid-svg-TfRJ9NjjpkvRRLqg .marker.cross{stroke:#333333;}#mermaid-svg-TfRJ9NjjpkvRRLqg svg{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-TfRJ9NjjpkvRRLqg .label{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;color:#333;}#mermaid-svg-TfRJ9NjjpkvRRLqg .cluster-label text{fill:#333;}#mermaid-svg-TfRJ9NjjpkvRRLqg .cluster-label span{color:#333;}#mermaid-svg-TfRJ9NjjpkvRRLqg .label text,#mermaid-svg-TfRJ9NjjpkvRRLqg span{fill:#333;color:#333;}#mermaid-svg-TfRJ9NjjpkvRRLqg .node rect,#mermaid-svg-TfRJ9NjjpkvRRLqg .node circle,#mermaid-svg-TfRJ9NjjpkvRRLqg .node ellipse,#mermaid-svg-TfRJ9NjjpkvRRLqg .node polygon,#mermaid-svg-TfRJ9NjjpkvRRLqg .node path{fill:#ECECFF;stroke:#9370DB;stroke-width:1px;}#mermaid-svg-TfRJ9NjjpkvRRLqg .node .label{text-align:center;}#mermaid-svg-TfRJ9NjjpkvRRLqg .node.clickable{cursor:pointer;}#mermaid-svg-TfRJ9NjjpkvRRLqg .arrowheadPath{fill:#333333;}#mermaid-svg-TfRJ9NjjpkvRRLqg .edgePath .path{stroke:#333333;stroke-width:2.0px;}#mermaid-svg-TfRJ9NjjpkvRRLqg .flowchart-link{stroke:#333333;fill:none;}#mermaid-svg-TfRJ9NjjpkvRRLqg .edgeLabel{background-color:#e8e8e8;text-align:center;}#mermaid-svg-TfRJ9NjjpkvRRLqg .edgeLabel rect{opacity:0.5;background-color:#e8e8e8;fill:#e8e8e8;}#mermaid-svg-TfRJ9NjjpkvRRLqg .cluster rect{fill:#ffffde;stroke:#aaaa33;stroke-width:1px;}#mermaid-svg-TfRJ9NjjpkvRRLqg .cluster text{fill:#333;}#mermaid-svg-TfRJ9NjjpkvRRLqg .cluster span{color:#333;}#mermaid-svg-TfRJ9NjjpkvRRLqg div.mermaidTooltip{position:absolute;text-align:center;max-width:200px;padding:2px;font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:12px;background:hsl(80, 100%, 96.2745098039%);border:1px solid #aaaa33;border-radius:2px;pointer-events:none;z-index:100;}#mermaid-svg-TfRJ9NjjpkvRRLqg :root{&#8211;mermaid-font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;}<span id=\"L-L-A-B\" class=\"edgeLabel L-LS-A&#039; L-LE-B\"><\/span><span id=\"L-L-A-C\" class=\"edgeLabel L-LS-A&#039; L-LE-C\"><\/span><span id=\"L-L-A-D\" class=\"edgeLabel L-LS-A&#039; L-LE-D\"><\/span><span id=\"L-L-B-B1\" class=\"edgeLabel L-LS-B&#039; L-LE-B1\"><\/span><span id=\"L-L-B-B2\" class=\"edgeLabel L-LS-B&#039; L-LE-B2\"><\/span><span id=\"L-L-B-B3\" class=\"edgeLabel L-LS-B&#039; L-LE-B3\"><\/span><span id=\"L-L-C-C1\" class=\"edgeLabel L-LS-C&#039; L-LE-C1\"><\/span><span id=\"L-L-C-C2\" class=\"edgeLabel L-LS-C&#039; L-LE-C2\"><\/span><span id=\"L-L-C-C3\" class=\"edgeLabel L-LS-C&#039; L-LE-C3\"><\/span><span id=\"L-L-D-D1\" class=\"edgeLabel L-LS-D&#039; L-LE-D1\"><\/span><span id=\"L-L-D-D2\" class=\"edgeLabel L-LS-D&#039; L-LE-D2\"><\/span><span id=\"L-L-D-D3\" class=\"edgeLabel L-LS-D&#039; L-LE-D3\"><\/span><span id=\"L-L-E-E1\" class=\"edgeLabel L-LS-E&#039; L-LE-E1\"><\/span><span id=\"L-L-E-E2\" class=\"edgeLabel L-LS-E&#039; L-LE-E2\"><\/span><span id=\"L-L-E1-E11\" class=\"edgeLabel L-LS-E1&#039; L-LE-E11\"><\/span><span id=\"L-L-E1-E12\" class=\"edgeLabel L-LS-E1&#039; L-LE-E12\"><\/span><span id=\"L-L-E2-E21\" class=\"edgeLabel L-LS-E2&#039; L-LE-E21\"><\/span><span id=\"L-L-E2-E22\" class=\"edgeLabel L-LS-E2&#039; L-LE-E22\"><\/span>BRIN\u7d22\u5f15\u7ed3\u6784\u5757\u8303\u56f4\u7d22\u5f15\u6458\u8981\u4fe1\u606f\u7a00\u758f\u7d22\u5f15\u6309\u7269\u7406\u9875\u9762\u5206\u7ec4\u9ed8\u8ba4128\u9875\u9762\u4e00\u7ec4\u5b58\u50a8\u6bcf\u7ec4\u8303\u56f4\u6700\u5c0f\u503c\u548c\u6700\u5927\u503c\u5927\u8868\u53cb\u597d\u7d22\u5f15\u5927\u5c0f\u5f88\u5c0fMin\/Max\u503c\u8303\u56f4\u8fb9\u754c\u4fe1\u606f\u5305\u542b\u4fe1\u606f\u662f\u5426\u5305\u542bNULL\u503c\u4f4d\u56fe\u4fe1\u606f\u7279\u5b9a\u503c\u5b58\u5728\u6027\u4e0d\u5b58\u50a8\u5177\u4f53\u4f4d\u7f6e\u53ea\u8bb0\u5f55\u8303\u56f4\u4fe1\u606f\u67e5\u8be2\u65f6\u9700\u8981\u626b\u63cf\u6574\u4e2a\u9875\u9762\u8303\u56f4\u9002\u5408\u5927\u8868\u6570\u636e\u6709\u5e8f\u6027\u597d\u7684\u573a\u666fBRIN vs 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L-LE-E5\"><\/span>\u7d22\u5f15\u7ef4\u62a4\u7b56\u7565\u76d1\u63a7\u6307\u6807\u7ef4\u62a4\u64cd\u4f5c\u4f18\u5316\u65f6\u673a\u7d22\u5f15\u4f7f\u7528\u60c5\u51b5pg_stat_user_indexes\u7d22\u5f15\u81a8\u80c0\u7a0b\u5ea6pgstattuple\u6269\u5c55\u67e5\u8be2\u6027\u80fd\u6267\u884c\u65f6\u95f4\u76d1\u63a7\u7ef4\u62a4\u6210\u672c\u66f4\u65b0\u64cd\u4f5c\u5f71\u54cdREINDEX\u91cd\u5efa\u6d88\u9664\u788e\u7247VACUUM\u7ef4\u62a4\u56de\u6536\u7a7a\u95f4ANALYZE\u66f4\u65b0\u7edf\u8ba1\u4fe1\u606f\u5220\u9664\u65e0\u7528\u7d22\u5f15\u51cf\u5c11\u7ef4\u62a4\u5f00\u9500\u6027\u80fd\u4e0b\u964d\u65f6\u67e5\u8be2\u53d8\u6162\u7d22\u5f15\u81a8\u80c0\u4e25\u91cd\u7a7a\u95f4\u6d6a\u8d39\u5927\u7edf\u8ba1\u4fe1\u606f\u8fc7\u671f\u6267\u884c\u8ba1\u5212\u4e0d\u51c6\u5b9a\u671f\u7ef4\u62a4\u9884\u9632\u6027\u64cd\u4f5c\u7ef4\u62a4\u6d41\u7a0b1. \u6027\u80fd\u57fa\u7ebf\u6d4b\u91cf2. \u8bc6\u522b\u95ee\u9898\u7d22\u5f153. \u5236\u5b9a\u7ef4\u62a4\u8ba1\u52124. \u6267\u884c\u7ef4\u62a4\u64cd\u4f5c5. \u9a8c\u8bc1\u6548\u679c<\/p>\n<h4>\u7d22\u5f15\u76d1\u63a7SQL<\/h4>\n<p><span class=\"token comment\">&#8212; \u67e5\u770b\u7d22\u5f15\u4f7f\u7528\u60c5\u51b5<\/span><br \/>\n<span class=\"token keyword\">SELECT<\/span> schemaname<span class=\"token punctuation\">,<\/span> tablename<span class=\"token punctuation\">,<\/span> indexname<span class=\"token punctuation\">,<\/span><br \/>\n       idx_scan<span class=\"token punctuation\">,<\/span> idx_tup_read<span class=\"token punctuation\">,<\/span> idx_tup_fetch<br \/>\n<span class=\"token keyword\">FROM<\/span> pg_stat_user_indexes<br \/>\n<span class=\"token keyword\">ORDER<\/span> <span class=\"token keyword\">BY<\/span> idx_scan <span class=\"token keyword\">DESC<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">&#8212; \u67e5\u627e\u65e0\u7528\u7d22\u5f15<\/span><br \/>\n<span class=\"token keyword\">SELECT<\/span> schemaname<span class=\"token punctuation\">,<\/span> tablename<span class=\"token punctuation\">,<\/span> indexname<span class=\"token punctuation\">,<\/span> idx_scan<br \/>\n<span class=\"token keyword\">FROM<\/span> pg_stat_user_indexes<br \/>\n<span class=\"token keyword\">WHERE<\/span> idx_scan <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">AND<\/span> schemaname <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;public&#039;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">&#8212; \u67e5\u770b\u7d22\u5f15\u5927\u5c0f<\/span><br \/>\n<span class=\"token keyword\">SELECT<\/span> schemaname<span class=\"token punctuation\">,<\/span> tablename<span class=\"token punctuation\">,<\/span> indexname<span class=\"token punctuation\">,<\/span><br \/>\n       pg_size_pretty<span class=\"token punctuation\">(<\/span>pg_relation_size<span class=\"token punctuation\">(<\/span>indexrelid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">as<\/span> size<br \/>\n<span class=\"token keyword\">FROM<\/span> pg_stat_user_indexes<br \/>\n<span class=\"token keyword\">ORDER<\/span> <span class=\"token keyword\">BY<\/span> pg_relation_size<span class=\"token punctuation\">(<\/span>indexrelid<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">DESC<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h3>&#x1f3af; \u9ad8\u9891\u9762\u8bd5\u9898\u89e3\u6790<\/h3>\n<h4>\u9762\u8bd5\u98981&#xff1a;\u4ec0\u4e48\u60c5\u51b5\u4e0b\u7d22\u5f15\u4e0d\u751f\u6548&#xff1f;<\/h4>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250812083033-689afba92f9f1.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h4>\u9762\u8bd5\u98982&#xff1a;\u590d\u5408\u7d22\u5f15\u7684\u6700\u5de6\u524d\u7f00\u539f\u5219<\/h4>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250812083034-689afbaa95d5c.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h4>\u9762\u8bd5\u98983&#xff1a;\u90e8\u5206\u7d22\u5f15\u548c\u8868\u8fbe\u5f0f\u7d22\u5f15\u7684\u5e94\u7528\u573a\u666f<\/h4>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250812083037-689afbadd788d.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h4>\u9762\u8bd5\u98984&#xff1a;\u5982\u4f55\u9009\u62e9\u5408\u9002\u7684\u7d22\u5f15\u7c7b\u578b&#xff1f;<\/h4>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250812083039-689afbaff266b.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>&#x1f50d; \u7d22\u5f15\u6027\u80fd\u5206\u6790\u5b9e\u6218<\/h3>\n<h4>\u7d22\u5f15\u6548\u679c\u8bc4\u4f30\u4f53\u7cfb<\/h4>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250812083045-689afbb545f0f.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h4>\u7d22\u5f15\u4f18\u5316\u6848\u4f8b\u5206\u6790<\/h4>\n<p><span class=\"token comment\">&#8212; \u6848\u4f8b1&#xff1a;\u8ba2\u5355\u67e5\u8be2\u4f18\u5316<\/span><br \/>\n<span class=\"token comment\">&#8212; \u539f\u59cb\u67e5\u8be2&#xff08;\u6162&#xff09;<\/span><br \/>\n<span class=\"token keyword\">EXPLAIN<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">ANALYZE<\/span><span class=\"token punctuation\">,<\/span> BUFFERS<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">SELECT<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">FROM<\/span> orders<br \/>\n<span class=\"token keyword\">WHERE<\/span> customer_id <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">12345<\/span><br \/>\n  <span class=\"token operator\">AND<\/span> order_date <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token string\">&#039;2024-01-01&#039;<\/span><br \/>\n  <span class=\"token operator\">AND<\/span> <span class=\"token keyword\">status<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;completed&#039;<\/span><br \/>\n<span class=\"token keyword\">ORDER<\/span> <span class=\"token keyword\">BY<\/span> order_date <span class=\"token keyword\">DESC<\/span><br \/>\n<span class=\"token keyword\">LIMIT<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">&#8212; \u4f18\u5316\u65b9\u6848&#xff1a;\u521b\u5efa\u590d\u5408\u7d22\u5f15<\/span><br \/>\n<span class=\"token keyword\">CREATE<\/span> <span class=\"token keyword\">INDEX<\/span> idx_orders_customer_date_status<br \/>\n<span class=\"token keyword\">ON<\/span> orders <span class=\"token punctuation\">(<\/span>customer_id<span class=\"token punctuation\">,<\/span> order_date <span class=\"token keyword\">DESC<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">status<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">WHERE<\/span> <span class=\"token keyword\">status<\/span> <span class=\"token operator\">IN<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;completed&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;shipped&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">&#8212; \u6848\u4f8b2&#xff1a;JSON\u67e5\u8be2\u4f18\u5316<\/span><br \/>\n<span class=\"token comment\">&#8212; \u539f\u59cb\u67e5\u8be2&#xff08;\u6162&#xff09;<\/span><br \/>\n<span class=\"token keyword\">SELECT<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">FROM<\/span> products<br \/>\n<span class=\"token keyword\">WHERE<\/span> attributes<span class=\"token operator\">&#8211;<\/span><span class=\"token operator\">&gt;&gt;<\/span><span class=\"token string\">&#039;category&#039;<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;electronics&#039;<\/span><br \/>\n  <span class=\"token operator\">AND<\/span> <span class=\"token punctuation\">(<\/span>attributes<span class=\"token operator\">&#8211;<\/span><span class=\"token operator\">&gt;&gt;<\/span><span class=\"token string\">&#039;price&#039;<\/span><span class=\"token punctuation\">)<\/span>::<span class=\"token keyword\">numeric<\/span> <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">1000<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">&#8212; \u4f18\u5316\u65b9\u6848&#xff1a;GIN\u7d22\u5f15 &#043; \u8868\u8fbe\u5f0f\u7d22\u5f15<\/span><br \/>\n<span class=\"token keyword\">CREATE<\/span> <span class=\"token keyword\">INDEX<\/span> idx_products_gin <span class=\"token keyword\">ON<\/span> products <span class=\"token keyword\">USING<\/span> GIN <span class=\"token punctuation\">(<\/span>attributes<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">CREATE<\/span> <span class=\"token keyword\">INDEX<\/span> idx_products_category <span class=\"token keyword\">ON<\/span> products <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>attributes<span class=\"token operator\">&#8211;<\/span><span class=\"token operator\">&gt;&gt;<\/span><span class=\"token string\">&#039;category&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">CREATE<\/span> <span class=\"token keyword\">INDEX<\/span> idx_products_price <span class=\"token keyword\">ON<\/span> products <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>attributes<span class=\"token operator\">&#8211;<\/span><span class=\"token operator\">&gt;&gt;<\/span><span class=\"token string\">&#039;price&#039;<\/span><span class=\"token punctuation\">)<\/span>::<span class=\"token keyword\">numeric<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h3>&#x1f680; PostgreSQL\u7279\u6709\u7d22\u5f15\u7279\u6027<\/h3>\n<h4>\u7d22\u5f15\u5e76\u53d1\u6784\u5efa<\/h4>\n<p>#mermaid-svg-7WNqgZURmDeDjeI0 {font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;fill:#333;}#mermaid-svg-7WNqgZURmDeDjeI0 .error-icon{fill:#552222;}#mermaid-svg-7WNqgZURmDeDjeI0 .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-7WNqgZURmDeDjeI0 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class=\"edgeLabel L-LS-B1&#039; L-LE-B13\"><\/span><span id=\"L-L-B2-B21\" class=\"edgeLabel L-LS-B2&#039; L-LE-B21\"><\/span><span id=\"L-L-B2-B22\" class=\"edgeLabel L-LS-B2&#039; L-LE-B22\"><\/span><span id=\"L-L-B2-B23\" class=\"edgeLabel L-LS-B2&#039; L-LE-B23\"><\/span><span id=\"L-L-B3-B31\" class=\"edgeLabel L-LS-B3&#039; L-LE-B31\"><\/span><span id=\"L-L-B3-B32\" class=\"edgeLabel L-LS-B3&#039; L-LE-B32\"><\/span><span id=\"L-L-B3-B33\" class=\"edgeLabel L-LS-B3&#039; L-LE-B33\"><\/span><span id=\"L-L-C-C1\" class=\"edgeLabel L-LS-C&#039; L-LE-C1\"><\/span><span id=\"L-L-C-C2\" class=\"edgeLabel L-LS-C&#039; L-LE-C2\"><\/span><span id=\"L-L-D-D1\" class=\"edgeLabel L-LS-D&#039; L-LE-D1\"><\/span><span id=\"L-L-D-D2\" class=\"edgeLabel L-LS-D&#039; L-LE-D2\"><\/span>\u7d22\u5f15\u5e76\u53d1\u64cd\u4f5cCREATE INDEX CONCURRENTLYDROP INDEX CONCURRENTLYREINDEX CONCURRENTLY\u4f18\u52bf\u7279\u70b9\u4f7f\u7528\u9650\u5236\u6ce8\u610f\u4e8b\u9879\u4e0d\u963b\u585e\u5199\u64cd\u4f5c\u5141\u8bb8\u5e76\u53d1DML\u751f\u4ea7\u73af\u5883\u53cb\u597d\u51cf\u5c11\u670d\u52a1\u4e2d\u65ad\u6e10\u8fdb\u5f0f\u6784\u5efa\u5206\u9636\u6bb5\u5b8c\u6210\u4e0d\u80fd\u5728\u4e8b\u52a1\u4e2d\u6267\u884cautocommit\u6a21\u5f0f\u53ef\u80fd\u6784\u5efa\u5931\u8d25\u9700\u8981\u5904\u7406invalid\u72b6\u6001\u65f6\u95f4\u8f83\u957f\u9700\u8981\u591a\u6b21\u626b\u63cf\u8868\u76d1\u63a7\u6784\u5efa\u8fdb\u5ea6pg_stat_progress_create_index\u5904\u7406\u5931\u8d25\u7d22\u5f15\u624b\u52a8\u5220\u9664invalid\u7d22\u5f15\u907f\u514d\u9ad8\u5cf0\u671f\u9009\u62e9\u5408\u9002\u65f6\u95f4\u7a97\u53e3\u5b89\u5168\u5220\u9664\u7d22\u5f15\u4e0d\u5f71\u54cd\u67e5\u8be2\u4e24\u9636\u6bb5\u5220\u9664\u5148\u6807\u8bb0\u540e\u5220\u9664\u5728\u7ebf\u91cd\u5efaPostgreSQL 12&#043;\u51cf\u5c11\u9501\u5b9a\u65f6\u95f4\u63d0\u9ad8\u53ef\u7528\u6027<\/p>\n<h4>\u7d22\u5f15\u9ad8\u7ea7\u7279\u6027<\/h4>\n<p>#mermaid-svg-gxrWdiTzWH6NDb5W {font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;fill:#333;}#mermaid-svg-gxrWdiTzWH6NDb5W .error-icon{fill:#552222;}#mermaid-svg-gxrWdiTzWH6NDb5W .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-gxrWdiTzWH6NDb5W .edge-thickness-normal{stroke-width:2px;}#mermaid-svg-gxrWdiTzWH6NDb5W .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-gxrWdiTzWH6NDb5W .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-gxrWdiTzWH6NDb5W .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-gxrWdiTzWH6NDb5W .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-gxrWdiTzWH6NDb5W .marker{fill:#333333;stroke:#333333;}#mermaid-svg-gxrWdiTzWH6NDb5W .marker.cross{stroke:#333333;}#mermaid-svg-gxrWdiTzWH6NDb5W svg{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-gxrWdiTzWH6NDb5W .label{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;color:#333;}#mermaid-svg-gxrWdiTzWH6NDb5W .cluster-label text{fill:#333;}#mermaid-svg-gxrWdiTzWH6NDb5W .cluster-label span{color:#333;}#mermaid-svg-gxrWdiTzWH6NDb5W .label text,#mermaid-svg-gxrWdiTzWH6NDb5W span{fill:#333;color:#333;}#mermaid-svg-gxrWdiTzWH6NDb5W .node rect,#mermaid-svg-gxrWdiTzWH6NDb5W .node circle,#mermaid-svg-gxrWdiTzWH6NDb5W .node ellipse,#mermaid-svg-gxrWdiTzWH6NDb5W .node polygon,#mermaid-svg-gxrWdiTzWH6NDb5W .node path{fill:#ECECFF;stroke:#9370DB;stroke-width:1px;}#mermaid-svg-gxrWdiTzWH6NDb5W .node .label{text-align:center;}#mermaid-svg-gxrWdiTzWH6NDb5W .node.clickable{cursor:pointer;}#mermaid-svg-gxrWdiTzWH6NDb5W .arrowheadPath{fill:#333333;}#mermaid-svg-gxrWdiTzWH6NDb5W .edgePath .path{stroke:#333333;stroke-width:2.0px;}#mermaid-svg-gxrWdiTzWH6NDb5W .flowchart-link{stroke:#333333;fill:none;}#mermaid-svg-gxrWdiTzWH6NDb5W .edgeLabel{background-color:#e8e8e8;text-align:center;}#mermaid-svg-gxrWdiTzWH6NDb5W .edgeLabel rect{opacity:0.5;background-color:#e8e8e8;fill:#e8e8e8;}#mermaid-svg-gxrWdiTzWH6NDb5W .cluster rect{fill:#ffffde;stroke:#aaaa33;stroke-width:1px;}#mermaid-svg-gxrWdiTzWH6NDb5W .cluster text{fill:#333;}#mermaid-svg-gxrWdiTzWH6NDb5W .cluster span{color:#333;}#mermaid-svg-gxrWdiTzWH6NDb5W div.mermaidTooltip{position:absolute;text-align:center;max-width:200px;padding:2px;font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:12px;background:hsl(80, 100%, 96.2745098039%);border:1px solid #aaaa33;border-radius:2px;pointer-events:none;z-index:100;}#mermaid-svg-gxrWdiTzWH6NDb5W :root{&#8211;mermaid-font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;}<span id=\"L-L-A-B\" class=\"edgeLabel L-LS-A&#039; L-LE-B\"><\/span><span id=\"L-L-A-C\" class=\"edgeLabel L-LS-A&#039; L-LE-C\"><\/span><span id=\"L-L-A-D\" class=\"edgeLabel L-LS-A&#039; L-LE-D\"><\/span><span id=\"L-L-B-B1\" class=\"edgeLabel L-LS-B&#039; L-LE-B1\"><\/span><span id=\"L-L-B-B2\" class=\"edgeLabel L-LS-B&#039; L-LE-B2\"><\/span><span id=\"L-L-B-B3\" class=\"edgeLabel L-LS-B&#039; L-LE-B3\"><\/span><span id=\"L-L-C-C1\" class=\"edgeLabel L-LS-C&#039; L-LE-C1\"><\/span><span id=\"L-L-C-C2\" class=\"edgeLabel L-LS-C&#039; L-LE-C2\"><\/span><span id=\"L-L-C-C3\" class=\"edgeLabel L-LS-C&#039; L-LE-C3\"><\/span><span id=\"L-L-D-D1\" class=\"edgeLabel L-LS-D&#039; L-LE-D1\"><\/span><span id=\"L-L-D-D2\" class=\"edgeLabel L-LS-D&#039; L-LE-D2\"><\/span><span id=\"L-L-D-D3\" class=\"edgeLabel L-LS-D&#039; L-LE-D3\"><\/span><span id=\"L-L-E-E1\" class=\"edgeLabel L-LS-E&#039; L-LE-E1\"><\/span><span id=\"L-L-E-E2\" class=\"edgeLabel L-LS-E&#039; L-LE-E2\"><\/span><span id=\"L-L-E-E3\" class=\"edgeLabel L-LS-E&#039; L-LE-E3\"><\/span>PostgreSQL\u7d22\u5f15\u9ad8\u7ea7\u7279\u6027\u6761\u4ef6\u7d22\u5f15\u5305\u542b\u5217\u7d22\u5f15\u7d22\u5f15\u626b\u63cf\u4f18\u5316WHERE\u5b50\u53e5\u8fc7\u6ee4\u53ea\u7d22\u5f15\u6ee1\u8db3\u6761\u4ef6\u7684\u884c\u5927\u5e45\u51cf\u5c11\u7d22\u5f15\u5927\u5c0f\u63d0\u9ad8\u7ef4\u62a4\u6548\u7387\u7cbe\u786e\u5339\u914d\u67e5\u8be2\u67e5\u8be2\u6761\u4ef6\u5fc5\u987b\u5339\u914dINCLUDE\u8bed\u6cd5PostgreSQL 11&#043;\u975e\u952e\u5217\u5305\u542b\u907f\u514d\u56de\u8868\u64cd\u4f5c\u8986\u76d6\u67e5\u8be2\u4f18\u5316\u6240\u6709\u5217\u90fd\u5728\u7d22\u5f15\u4e2d\u7d22\u5f15\u8df3\u8dc3\u626b\u63cfSkip Scan\u4f18\u5316\u4f4d\u56fe\u7d22\u5f15\u626b\u63cf\u591a\u7d22\u5f15\u5408\u5e76\u7d22\u5f15\u6761\u4ef6\u4e0b\u63a8Index Condition Pushdown\u5b9e\u9645\u5e94\u7528\u7535\u5546\u67e5\u8be2\u4f18\u5316\u5546\u54c1\u5206\u7c7b&#043;\u4ef7\u683c\u8303\u56f4\u65e5\u5fd7\u5206\u6790\u65f6\u95f4\u8303\u56f4&#043;\u72b6\u6001\u8fc7\u6ee4\u7528\u6237\u7cfb\u7edf\u6d3b\u8dc3\u7528\u6237\u90ae\u7bb1\u67e5\u8be2<\/p>\n<h3>&#x1f4ca; \u7d22\u5f15\u76d1\u63a7\u4e0e\u8bca\u65ad<\/h3>\n<h4>\u7d22\u5f15\u5065\u5eb7\u72b6\u51b5\u68c0\u67e5<\/h4>\n<p>#mermaid-svg-ncbeC9CvEEP0JtP1 {font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;fill:#333;}#mermaid-svg-ncbeC9CvEEP0JtP1 .error-icon{fill:#552222;}#mermaid-svg-ncbeC9CvEEP0JtP1 .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-ncbeC9CvEEP0JtP1 .edge-thickness-normal{stroke-width:2px;}#mermaid-svg-ncbeC9CvEEP0JtP1 .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-ncbeC9CvEEP0JtP1 .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-ncbeC9CvEEP0JtP1 .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-ncbeC9CvEEP0JtP1 .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-ncbeC9CvEEP0JtP1 .marker{fill:#333333;stroke:#333333;}#mermaid-svg-ncbeC9CvEEP0JtP1 .marker.cross{stroke:#333333;}#mermaid-svg-ncbeC9CvEEP0JtP1 svg{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-ncbeC9CvEEP0JtP1 .label{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;color:#333;}#mermaid-svg-ncbeC9CvEEP0JtP1 .cluster-label text{fill:#333;}#mermaid-svg-ncbeC9CvEEP0JtP1 .cluster-label span{color:#333;}#mermaid-svg-ncbeC9CvEEP0JtP1 .label text,#mermaid-svg-ncbeC9CvEEP0JtP1 span{fill:#333;color:#333;}#mermaid-svg-ncbeC9CvEEP0JtP1 .node rect,#mermaid-svg-ncbeC9CvEEP0JtP1 .node circle,#mermaid-svg-ncbeC9CvEEP0JtP1 .node ellipse,#mermaid-svg-ncbeC9CvEEP0JtP1 .node polygon,#mermaid-svg-ncbeC9CvEEP0JtP1 .node path{fill:#ECECFF;stroke:#9370DB;stroke-width:1px;}#mermaid-svg-ncbeC9CvEEP0JtP1 .node .label{text-align:center;}#mermaid-svg-ncbeC9CvEEP0JtP1 .node.clickable{cursor:pointer;}#mermaid-svg-ncbeC9CvEEP0JtP1 .arrowheadPath{fill:#333333;}#mermaid-svg-ncbeC9CvEEP0JtP1 .edgePath .path{stroke:#333333;stroke-width:2.0px;}#mermaid-svg-ncbeC9CvEEP0JtP1 .flowchart-link{stroke:#333333;fill:none;}#mermaid-svg-ncbeC9CvEEP0JtP1 .edgeLabel{background-color:#e8e8e8;text-align:center;}#mermaid-svg-ncbeC9CvEEP0JtP1 .edgeLabel rect{opacity:0.5;background-color:#e8e8e8;fill:#e8e8e8;}#mermaid-svg-ncbeC9CvEEP0JtP1 .cluster rect{fill:#ffffde;stroke:#aaaa33;stroke-width:1px;}#mermaid-svg-ncbeC9CvEEP0JtP1 .cluster text{fill:#333;}#mermaid-svg-ncbeC9CvEEP0JtP1 .cluster span{color:#333;}#mermaid-svg-ncbeC9CvEEP0JtP1 div.mermaidTooltip{position:absolute;text-align:center;max-width:200px;padding:2px;font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:12px;background:hsl(80, 100%, 96.2745098039%);border:1px solid #aaaa33;border-radius:2px;pointer-events:none;z-index:100;}#mermaid-svg-ncbeC9CvEEP0JtP1 :root{&#8211;mermaid-font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;}<span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"nodeLabel\">\u7d22\u5f15\u5065\u5eb7\u68c0\u67e5\u6d41\u7a0b<\/span><span class=\"nodeLabel\">1. \u4f7f\u7528\u60c5\u51b5\u5206\u6790<\/span><span class=\"nodeLabel\">2. \u6027\u80fd\u5f71\u54cd\u8bc4\u4f30<\/span><span class=\"nodeLabel\">3. \u5b58\u50a8\u5f00\u9500\u5206\u6790<\/span><span class=\"nodeLabel\">4. \u7ef4\u62a4\u6210\u672c\u8bc4\u4f30<\/span><span class=\"nodeLabel\">5. \u4f18\u5316\u5efa\u8bae\u751f\u6210<\/span><span class=\"nodeLabel\">\u67e5\u8be2pg_stat_user_indexesidx_scan, idx_tup_read<\/span><span class=\"nodeLabel\">\u8bc6\u522b\u672a\u4f7f\u7528\u7d22\u5f15idx_scan &#061; 0<\/span><span class=\"nodeLabel\">\u5206\u6790\u8bbf\u95ee\u6a21\u5f0f\u8bfb\u5199\u6bd4\u4f8b<\/span><span class=\"nodeLabel\">\u6267\u884c\u8ba1\u5212\u5206\u6790Index Scan vs Seq Scan<\/span><span class=\"nodeLabel\">\u67e5\u8be2\u65f6\u95f4\u5bf9\u6bd4\u6709\u65e0\u7d22\u5f15\u5dee\u5f02<\/span><span class=\"nodeLabel\">\u5e76\u53d1\u6027\u80fd\u6d4b\u8bd5\u9ad8\u8d1f\u8f7d\u4e0b\u8868\u73b0<\/span><span class=\"nodeLabel\">\u7d22\u5f15\u5927\u5c0f\u7edf\u8ba1pg_relation_size<\/span><span class=\"nodeLabel\">\u8868\u7d22\u5f15\u6bd4\u4f8b\u7d22\u5f15\u603b\u5927\u5c0f\/\u8868\u5927\u5c0f<\/span><span class=\"nodeLabel\">\u81a8\u80c0\u7a0b\u5ea6\u68c0\u67e5pgstattuple\u6269\u5c55<\/span><span class=\"nodeLabel\">\u66f4\u65b0\u9891\u7387\u5f71\u54cdDML\u64cd\u4f5c\u6210\u672c<\/span><span class=\"nodeLabel\">\u7ef4\u62a4\u7a97\u53e3\u9700\u6c42REINDEX\u65f6\u95f4<\/span><span class=\"nodeLabel\">\u7a7a\u95f4\u56de\u6536\u9700\u6c42VACUUM\u6548\u679c<\/span><span class=\"nodeLabel\">\u5220\u9664\u65e0\u7528\u7d22\u5f15\u51cf\u5c11\u7ef4\u62a4\u5f00\u9500<\/span><span class=\"nodeLabel\">\u5408\u5e76\u76f8\u4f3c\u7d22\u5f15\u4f18\u5316\u5b58\u50a8<\/span><span class=\"nodeLabel\">\u8c03\u6574\u7d22\u5f15\u53c2\u6570\u586b\u5145\u56e0\u5b50\u7b49<\/span><\/p>\n<h4>\u7d22\u5f15\u8bca\u65adSQL\u5de5\u5177\u7bb1<\/h4>\n<p><span class=\"token comment\">&#8212; \u7d22\u5f15\u4f7f\u7528\u60c5\u51b5\u6392\u884c<\/span><br \/>\n<span class=\"token keyword\">SELECT<\/span><br \/>\n    schemaname<span class=\"token punctuation\">,<\/span> tablename<span class=\"token punctuation\">,<\/span> indexname<span class=\"token punctuation\">,<\/span><br \/>\n    idx_scan<span class=\"token punctuation\">,<\/span> idx_tup_read<span class=\"token punctuation\">,<\/span> idx_tup_fetch<span class=\"token punctuation\">,<\/span><br \/>\n    pg_size_pretty<span class=\"token punctuation\">(<\/span>pg_relation_size<span class=\"token punctuation\">(<\/span>indexrelid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">as<\/span> size<br \/>\n<span class=\"token keyword\">FROM<\/span> pg_stat_user_indexes<br \/>\n<span class=\"token keyword\">ORDER<\/span> <span class=\"token keyword\">BY<\/span> idx_scan <span class=\"token keyword\">DESC<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">&#8212; \u627e\u51fa\u91cd\u590d\u548c\u5197\u4f59\u7d22\u5f15<\/span><br \/>\n<span class=\"token keyword\">WITH<\/span> index_cols <span class=\"token keyword\">AS<\/span> <span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token keyword\">SELECT<\/span> schemaname<span class=\"token punctuation\">,<\/span> tablename<span class=\"token punctuation\">,<\/span> indexname<span class=\"token punctuation\">,<\/span><br \/>\n           array_agg<span class=\"token punctuation\">(<\/span>attname <span class=\"token keyword\">ORDER<\/span> <span class=\"token keyword\">BY<\/span> attnum<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">as<\/span> cols<br \/>\n    <span class=\"token keyword\">FROM<\/span> pg_indexes i<br \/>\n    <span class=\"token keyword\">JOIN<\/span> pg_attribute a <span class=\"token keyword\">ON<\/span> a<span class=\"token punctuation\">.<\/span>attrelid <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span>schemaname<span class=\"token operator\">||<\/span><span class=\"token string\">&#039;.&#039;<\/span><span class=\"token operator\">||<\/span>tablename<span class=\"token punctuation\">)<\/span>::regclass<br \/>\n    <span class=\"token keyword\">WHERE<\/span> attnum <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">AND<\/span> <span class=\"token operator\">NOT<\/span> attisdropped<br \/>\n    <span class=\"token keyword\">GROUP<\/span> <span class=\"token keyword\">BY<\/span> schemaname<span class=\"token punctuation\">,<\/span> tablename<span class=\"token punctuation\">,<\/span> indexname<br \/>\n<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">SELECT<\/span> i1<span class=\"token punctuation\">.<\/span>schemaname<span class=\"token punctuation\">,<\/span> i1<span class=\"token punctuation\">.<\/span>tablename<span class=\"token punctuation\">,<\/span><br \/>\n       i1<span class=\"token punctuation\">.<\/span>indexname <span class=\"token keyword\">as<\/span> index1<span class=\"token punctuation\">,<\/span> i2<span class=\"token punctuation\">.<\/span>indexname <span class=\"token keyword\">as<\/span> index2<br \/>\n<span class=\"token keyword\">FROM<\/span> index_cols i1<br \/>\n<span class=\"token keyword\">JOIN<\/span> index_cols i2 <span class=\"token keyword\">ON<\/span> i1<span class=\"token punctuation\">.<\/span>schemaname <span class=\"token operator\">&#061;<\/span> i2<span class=\"token punctuation\">.<\/span>schemaname<br \/>\n                   <span class=\"token operator\">AND<\/span> i1<span class=\"token punctuation\">.<\/span>tablename <span class=\"token operator\">&#061;<\/span> i2<span class=\"token punctuation\">.<\/span>tablename<br \/>\n                   <span class=\"token operator\">AND<\/span> i1<span class=\"token punctuation\">.<\/span>indexname <span class=\"token operator\">&lt;<\/span> i2<span class=\"token punctuation\">.<\/span>indexname<br \/>\n<span class=\"token keyword\">WHERE<\/span> i1<span class=\"token punctuation\">.<\/span>cols <span class=\"token operator\">&lt;<\/span>&#064; i2<span class=\"token punctuation\">.<\/span>cols <span class=\"token operator\">OR<\/span> i2<span class=\"token punctuation\">.<\/span>cols <span class=\"token operator\">&lt;<\/span>&#064; i1<span class=\"token punctuation\">.<\/span>cols<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">&#8212; \u7d22\u5f15\u81a8\u80c0\u68c0\u67e5<\/span><br \/>\n<span class=\"token keyword\">SELECT<\/span> schemaname<span class=\"token punctuation\">,<\/span> tablename<span class=\"token punctuation\">,<\/span> indexname<span class=\"token punctuation\">,<\/span><br \/>\n       pg_size_pretty<span class=\"token punctuation\">(<\/span>pg_relation_size<span class=\"token punctuation\">(<\/span>indexrelid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">as<\/span> size<span class=\"token punctuation\">,<\/span><br \/>\n       <span class=\"token function\">round<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">100<\/span> <span class=\"token operator\">*<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span> <span class=\"token operator\">&#8211;<\/span> <span class=\"token punctuation\">(<\/span>avg_leaf_density<span class=\"token operator\">\/<\/span><span class=\"token number\">100.0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">as<\/span> bloat_pct<br \/>\n<span class=\"token keyword\">FROM<\/span> pg_stat_user_indexes si<br \/>\n<span class=\"token keyword\">JOIN<\/span> pgstattuple_approx<span class=\"token punctuation\">(<\/span>indexrelid<span class=\"token punctuation\">)<\/span> pst <span class=\"token keyword\">ON<\/span> <span class=\"token boolean\">true<\/span><br \/>\n<span class=\"token keyword\">WHERE<\/span> schemaname <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;public&#039;<\/span><br \/>\n<span class=\"token keyword\">ORDER<\/span> <span class=\"token keyword\">BY<\/span> pg_relation_size<span class=\"token punctuation\">(<\/span>indexrelid<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">DESC<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h3>&#x1f4c8; \u7d22\u5f15\u6027\u80fd\u8c03\u4f18\u6700\u4f73\u5b9e\u8df5<\/h3>\n<h4>\u7d22\u5f15\u8bbe\u8ba1\u539f\u5219\u603b\u7ed3<\/h4>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250812083047-689afbb7e98bc.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h4>\u7d22\u5f15\u4f18\u5316\u68c0\u67e5\u6e05\u5355<\/h4>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250812083050-689afbba1fcc9.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>&#x1f4dd; \u5b9e\u6218\u7ec3\u4e60<\/h3>\n<h4>\u7ec3\u4e601&#xff1a;\u7535\u5546\u7cfb\u7edf\u7d22\u5f15\u8bbe\u8ba1<\/h4>\n<p><span class=\"token comment\">&#8212; \u573a\u666f&#xff1a;\u7535\u5546\u8ba2\u5355\u8868&#xff0c;\u8bbe\u8ba1\u5408\u9002\u7684\u7d22\u5f15<\/span><br \/>\n<span class=\"token keyword\">CREATE<\/span> <span class=\"token keyword\">TABLE<\/span> orders <span class=\"token punctuation\">(<\/span><br \/>\n    order_id BIGSERIAL <span class=\"token keyword\">PRIMARY<\/span> <span class=\"token keyword\">KEY<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    customer_id <span class=\"token keyword\">INTEGER<\/span> <span class=\"token operator\">NOT<\/span> <span class=\"token boolean\">NULL<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    order_date TIMESTAMPTZ <span class=\"token operator\">NOT<\/span> <span class=\"token boolean\">NULL<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">status<\/span> <span class=\"token keyword\">VARCHAR<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">20<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">NOT<\/span> <span class=\"token boolean\">NULL<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    total_amount <span class=\"token keyword\">DECIMAL<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">12<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">NOT<\/span> <span class=\"token boolean\">NULL<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    shipping_address JSONB<span class=\"token punctuation\">,<\/span><br \/>\n    created_at TIMESTAMPTZ <span class=\"token keyword\">DEFAULT<\/span> <span class=\"token keyword\">CURRENT_TIMESTAMP<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">&#8212; \u5e38\u89c1\u67e5\u8be2\u6a21\u5f0f&#xff1a;<\/span><br \/>\n<span class=\"token comment\">&#8212; 1. \u67e5\u8be2\u5ba2\u6237\u7684\u6240\u6709\u8ba2\u5355&#xff1a;WHERE customer_id &#061; ?<\/span><br \/>\n<span class=\"token comment\">&#8212; 2. \u67e5\u8be2\u7279\u5b9a\u72b6\u6001\u7684\u8ba2\u5355&#xff1a;WHERE status &#061; ?<\/span><br \/>\n<span class=\"token comment\">&#8212; 3. \u67e5\u8be2\u65f6\u95f4\u8303\u56f4\u5185\u7684\u8ba2\u5355&#xff1a;WHERE order_date BETWEEN ? AND ?<\/span><br \/>\n<span class=\"token comment\">&#8212; 4. \u5ba2\u6237\u6700\u8fd1\u8ba2\u5355&#xff1a;WHERE customer_id &#061; ? ORDER BY order_date DESC LIMIT 10<\/span><\/p>\n<p><span class=\"token comment\">&#8212; \u63a8\u8350\u7d22\u5f15\u8bbe\u8ba1<\/span><br \/>\n<span class=\"token keyword\">CREATE<\/span> <span class=\"token keyword\">INDEX<\/span> idx_orders_customer_date <span class=\"token keyword\">ON<\/span> orders <span class=\"token punctuation\">(<\/span>customer_id<span class=\"token punctuation\">,<\/span> order_date <span class=\"token keyword\">DESC<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">CREATE<\/span> <span class=\"token keyword\">INDEX<\/span> idx_orders_status <span class=\"token keyword\">ON<\/span> orders <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">status<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">WHERE<\/span> <span class=\"token keyword\">status<\/span> <span class=\"token operator\">IN<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;pending&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#039;processing&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">CREATE<\/span> <span class=\"token keyword\">INDEX<\/span> idx_orders_date <span class=\"token keyword\">ON<\/span> orders <span class=\"token punctuation\">(<\/span>order_date<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">CREATE<\/span> <span class=\"token keyword\">INDEX<\/span> idx_orders_shipping_gin <span class=\"token keyword\">ON<\/span> orders <span class=\"token keyword\">USING<\/span> GIN <span class=\"token punctuation\">(<\/span>shipping_address<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>\u7ec3\u4e602&#xff1a;\u65e5\u5fd7\u8868BRIN\u7d22\u5f15\u5e94\u7528<\/h4>\n<p><span class=\"token comment\">&#8212; \u573a\u666f&#xff1a;\u7cfb\u7edf\u65e5\u5fd7\u8868&#xff0c;\u65f6\u95f4\u5e8f\u5217\u6570\u636e<\/span><br \/>\n<span class=\"token keyword\">CREATE<\/span> <span class=\"token keyword\">TABLE<\/span> system_logs <span class=\"token punctuation\">(<\/span><br \/>\n    log_id BIGSERIAL <span class=\"token keyword\">PRIMARY<\/span> <span class=\"token keyword\">KEY<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    log_time TIMESTAMPTZ <span class=\"token operator\">NOT<\/span> <span class=\"token boolean\">NULL<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token keyword\">level<\/span> <span class=\"token keyword\">VARCHAR<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">NOT<\/span> <span class=\"token boolean\">NULL<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    message <span class=\"token keyword\">TEXT<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    source_ip INET<span class=\"token punctuation\">,<\/span><br \/>\n    user_id <span class=\"token keyword\">INTEGER<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">&#8212; \u6570\u636e\u7279\u5f81&#xff1a;\u6309\u65f6\u95f4\u987a\u5e8f\u63d2\u5165&#xff0c;\u67e5\u8be2\u591a\u4e3a\u65f6\u95f4\u8303\u56f4\u67e5\u8be2<\/span><br \/>\n<span class=\"token comment\">&#8212; \u63a8\u8350\u4f7f\u7528BRIN\u7d22\u5f15<\/span><br \/>\n<span class=\"token keyword\">CREATE<\/span> <span class=\"token keyword\">INDEX<\/span> idx_logs_time_brin <span class=\"token keyword\">ON<\/span> system_logs <span class=\"token keyword\">USING<\/span> BRIN <span class=\"token punctuation\">(<\/span>log_time<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">CREATE<\/span> <span class=\"token keyword\">INDEX<\/span> idx_logs_level_btree <span class=\"token keyword\">ON<\/span> system_logs <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">level<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">&#8212; \u67e5\u8be2\u793a\u4f8b<\/span><br \/>\n<span class=\"token keyword\">SELECT<\/span> <span class=\"token function\">COUNT<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">FROM<\/span> system_logs<br \/>\n<span class=\"token keyword\">WHERE<\/span> log_time <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token string\">&#039;2024-01-01&#039;<\/span><br \/>\n  <span class=\"token operator\">AND<\/span> log_time <span class=\"token operator\">&lt;<\/span> <span class=\"token string\">&#039;2024-02-01&#039;<\/span><br \/>\n  <span class=\"token operator\">AND<\/span> <span class=\"token keyword\">level<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;ERROR&#039;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h3>&#x1f4cb; \u4eca\u65e5\u603b\u7ed3<\/h3>\n<h4>\u2705 \u6838\u5fc3\u638c\u63e1\u70b9<\/h4>\n<li>\u7d22\u5f15\u7c7b\u578b\u539f\u7406&#xff1a;B-tree\u3001Hash\u3001GIN\u3001GiST\u3001BRIN\u7684\u7ed3\u6784\u548c\u9002\u7528\u573a\u666f<\/li>\n<li>\u590d\u5408\u7d22\u5f15\u8bbe\u8ba1&#xff1a;\u6700\u5de6\u524d\u7f00\u539f\u5219\u3001\u5217\u987a\u5e8f\u4f18\u5316\u7b56\u7565<\/li>\n<li>\u7279\u6b8a\u7d22\u5f15\u5e94\u7528&#xff1a;\u90e8\u5206\u7d22\u5f15\u3001\u8868\u8fbe\u5f0f\u7d22\u5f15\u3001\u8986\u76d6\u7d22\u5f15\u7684\u4f7f\u7528\u573a\u666f<\/li>\n<li>\u7d22\u5f15\u7ef4\u62a4\u7b56\u7565&#xff1a;\u76d1\u63a7\u3001\u8bca\u65ad\u3001\u4f18\u5316\u7684\u7cfb\u7edf\u65b9\u6cd5<\/li>\n<li>\u6027\u80fd\u8c03\u4f18\u6280\u5de7&#xff1a;\u7d22\u5f15\u9009\u62e9\u51b3\u7b56\u3001\u4f18\u5316\u68c0\u67e5\u6e05\u5355<\/li>\n<h4>&#x1f3af; \u9762\u8bd5\u91cd\u70b9\u5f3a\u5316<\/h4>\n<p>#mermaid-svg-M6h7bSfsJRQlUaoB {font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;fill:#333;}#mermaid-svg-M6h7bSfsJRQlUaoB 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text{fill:#333;}#mermaid-svg-M6h7bSfsJRQlUaoB .cluster span{color:#333;}#mermaid-svg-M6h7bSfsJRQlUaoB div.mermaidTooltip{position:absolute;text-align:center;max-width:200px;padding:2px;font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:12px;background:hsl(80, 100%, 96.2745098039%);border:1px solid #aaaa33;border-radius:2px;pointer-events:none;z-index:100;}#mermaid-svg-M6h7bSfsJRQlUaoB :root{&#8211;mermaid-font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;}<span id=\"L-L-A-B\" class=\"edgeLabel L-LS-A&#039; L-LE-B\"><\/span><span id=\"L-L-A-C\" class=\"edgeLabel L-LS-A&#039; L-LE-C\"><\/span><span id=\"L-L-A-D\" class=\"edgeLabel L-LS-A&#039; L-LE-D\"><\/span><span id=\"L-L-A-E\" class=\"edgeLabel L-LS-A&#039; L-LE-E\"><\/span><span id=\"L-L-B-B1\" class=\"edgeLabel L-LS-B&#039; L-LE-B1\"><\/span><span id=\"L-L-C-C1\" class=\"edgeLabel L-LS-C&#039; L-LE-C1\"><\/span><span id=\"L-L-D-D1\" class=\"edgeLabel L-LS-D&#039; L-LE-D1\"><\/span><span 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