{"id":234,"date":"2026-08-26T08:40:33","date_gmt":"2026-08-26T00:40:33","guid":{"rendered":"https:\/\/yykcj.com\/?p=234"},"modified":"2026-08-26T08:40:33","modified_gmt":"2026-08-26T00:40:33","slug":"postgresql-%e7%b4%a2%e5%bc%95%e4%bc%98%e5%8c%96%e5%ae%9e%e6%88%98%ef%bc%9a%e4%bb%8e%e6%85%a2%e6%9f%a5%e8%af%a2%e5%88%b0%e9%ab%98%e6%80%a7%e8%83%bd%e7%9a%84%e8%bf%9b%e9%98%b6%e6%8c%87%e5%8d%97","status":"publish","type":"post","link":"https:\/\/yykcj.com\/?p=234","title":{"rendered":"PostgreSQL \u7d22\u5f15\u4f18\u5316\u5b9e\u6218\uff1a\u4ece\u6162\u67e5\u8be2\u5230\u9ad8\u6027\u80fd\u7684\u8fdb\u9636\u6307\u5357"},"content":{"rendered":"<h2>\u5f15\u8a00<\/h2>\n<p>\u5728\u5e94\u7528\u5f00\u53d1\u4e2d\uff0c\u6570\u636e\u5e93\u6027\u80fd\u5f80\u5f80\u662f\u7cfb\u7edf\u7684\u74f6\u9888\u3002PostgreSQL \u4f5c\u4e3a\u529f\u80fd\u5f3a\u5927\u7684\u5f00\u6e90\u5173\u7cfb\u578b\u6570\u636e\u5e93\uff0c\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u7d22\u5f15\u7c7b\u578b\uff0c\u4f46\u5f88\u591a\u5f00\u53d1\u8005\u4ec5\u505c\u7559\u5728\u201c\u5efa\u7d22\u5f15\u201d\u7684\u5c42\u9762\uff0c\u5bfc\u81f4\u7d22\u5f15\u5931\u6548\u6216\u6027\u80fd\u4e0d\u4f73\u3002\u672c\u6587\u5c06\u4ece\u5b9e\u6218\u89d2\u5ea6\u51fa\u53d1\uff0c\u5e26\u4f60\u6df1\u5165\u7406\u89e3 PostgreSQL \u7d22\u5f15\u7684\u539f\u7406\u4e0e\u4f18\u5316\u6280\u5de7\uff0c\u901a\u8fc7\u5177\u4f53\u6848\u4f8b\uff0c\u624b\u628a\u624b\u6559\u4f60\u8bbe\u8ba1\u9ad8\u6548\u7684\u7d22\u5f15\uff0c\u907f\u5f00\u5e38\u89c1\u9677\u9631\u3002<\/p>\n<h2>\u4e3a\u4ec0\u4e48\u7d22\u5f15\u5f88\u91cd\u8981\uff1f<\/h2>\n<p>\u7d22\u5f15\u662f\u52a0\u901f\u6570\u636e\u68c0\u7d22\u7684\u201c\u76ee\u5f55\u201d\u3002\u6ca1\u6709\u7d22\u5f15\uff0c\u6570\u636e\u5e93\u5fc5\u987b\u5168\u8868\u626b\u63cf\uff08Seq Scan\uff09\uff0c\u5f53\u8868\u6570\u636e\u91cf\u8fbe\u5230\u767e\u4e07\u7ea7\uff0c\u67e5\u8be2\u6027\u80fd\u4f1a\u6025\u5267\u4e0b\u964d\u3002\u5408\u7406\u4f7f\u7528\u7d22\u5f15\uff0c\u53ef\u4ee5\u5c06\u67e5\u8be2\u65f6\u95f4\u4ece\u51e0\u79d2\u964d\u5230\u6beb\u79d2\u7ea7\u3002\u4f46\u7d22\u5f15\u5e76\u975e\u8d8a\u591a\u8d8a\u597d\uff0c\u5b83\u5360\u7528\u5b58\u50a8\u7a7a\u95f4\uff0c\u5e76\u589e\u52a0\u5199\u64cd\u4f5c\u7684\u5f00\u9500\u3002\u56e0\u6b64\uff0c\u7d22\u5f15\u4f18\u5316\u662f\u6027\u80fd\u8c03\u4f18\u7684\u6838\u5fc3\u3002<\/p>\n<h2>\u7406\u89e3 PostgreSQL \u7d22\u5f15\u7c7b\u578b<\/h2>\n<p>PostgreSQL \u652f\u6301\u591a\u79cd\u7d22\u5f15\u7c7b\u578b\uff0c\u6bcf\u79cd\u90fd\u6709\u5176\u9002\u7528\u573a\u666f\u3002<\/p>\n<h3>B-tree \u7d22\u5f15<\/h3>\n<p>B-tree \u662f\u9ed8\u8ba4\u7c7b\u578b\uff0c\u9002\u7528\u4e8e\u7b49\u503c\u67e5\u8be2\u548c\u8303\u56f4\u67e5\u8be2\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code class=\"language-sql\">\nCREATE INDEX idx_users_age ON users (age);\n<\/code><\/pre>\n<h3>Hash \u7d22\u5f15<\/h3>\n<p>Hash \u7d22\u5f15\u9002\u7528\u4e8e\u7b49\u503c\u67e5\u8be2\uff0c\u4f46 PostgreSQL 10 \u4e4b\u524d\u4e0d\u652f\u6301 WAL \u65e5\u5fd7\uff0c\u73b0\u5728\u5df2\u6539\u5584\uff0c\u4f46 B-tree \u901a\u5e38\u66f4\u4f18\u3002<\/p>\n<pre><code class=\"language-sql\">\nCREATE INDEX idx_users_email ON users USING hash (email);\n<\/code><\/pre>\n<h3>GIN \u7d22\u5f15<\/h3>\n<p>\u9002\u7528\u4e8e\u5168\u6587\u641c\u7d22\u3001\u6570\u7ec4\u3001JSONB \u7b49\u590d\u5408\u7c7b\u578b\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code class=\"language-sql\">\nCREATE INDEX idx_articles_tags ON articles USING gin (tags);\n<\/code><\/pre>\n<h3>GiST \u7d22\u5f15<\/h3>\n<p>\u9002\u7528\u4e8e\u5730\u7406\u7a7a\u95f4\u548c\u5168\u6587\u641c\u7d22\u3002<\/p>\n<pre><code class=\"language-sql\">\nCREATE INDEX idx_locations_coordinates ON locations USING gist (coordinates);\n<\/code><\/pre>\n<p>\u9009\u62e9\u6b63\u786e\u7684\u7d22\u5f15\u7c7b\u578b\u662f\u4f18\u5316\u7684\u7b2c\u4e00\u6b65\u3002<\/p>\n<h2>\u4f7f\u7528 EXPLAIN \u5206\u6790\u67e5\u8be2<\/h2>\n<p>\u5728\u4f18\u5316\u7d22\u5f15\u524d\uff0c\u5fc5\u987b\u5b66\u4f1a\u4f7f\u7528 <code>EXPLAIN<\/code> \u5206\u6790\u67e5\u8be2\u8ba1\u5212\u3002<\/p>\n<pre><code class=\"language-sql\">\nEXPLAIN ANALYZE SELECT * FROM users WHERE age &gt; 30;\n<\/code><\/pre>\n<p>\u8f93\u51fa\u793a\u4f8b\uff1a<\/p>\n<pre><code>\nSeq Scan on users  (cost=0.00..1838.00 rows=1000 width=16) (actual time=0.012..12.345 rows=1000 loops=1)\n  Filter: (age &gt; 30)\nPlanning Time: 0.123 ms\nExecution Time: 12.456 ms\n<\/code><\/pre>\n<p>\u5982\u679c\u770b\u5230 <code>Seq Scan<\/code>\uff0c\u8bf4\u660e\u6ca1\u6709\u4f7f\u7528\u7d22\u5f15\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7 <code>EXPLAIN<\/code> \u6765\u9a8c\u8bc1\u7d22\u5f15\u662f\u5426\u751f\u6548\u3002<\/p>\n<h2>\u5b9e\u6218\u6848\u4f8b\uff1a\u4f18\u5316\u4e00\u4e2a\u6162\u67e5\u8be2<\/h2>\n<p>\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u8ba2\u5355\u8868 <code>orders<\/code>\uff0c\u5305\u542b <code>user<em>id<\/code>, <code>created<\/em>at<\/code>, <code>status<\/code> \u7b49\u5b57\u6bb5\uff0c\u6570\u636e\u91cf 500 \u4e07\u884c\u3002<\/p>\n<h3>\u573a\u666f\u4e00\uff1a\u7b49\u503c\u67e5\u8be2 + \u6392\u5e8f<\/h3>\n<p>\u67e5\u8be2\u67d0\u7528\u6237\u6700\u8fd1\u7684\u8ba2\u5355\uff1a<\/p>\n<pre><code class=\"language-sql\">\nSELECT * FROM orders WHERE user_id = 123 ORDER BY created_at DESC LIMIT 10;\n<\/code><\/pre>\n<p><strong>\u95ee\u9898<\/strong>\uff1a\u5355\u72ec\u5728 <code>user_id<\/code> \u4e0a\u5efa\u7d22\u5f15\uff0c\u6392\u5e8f\u9700\u8981\u989d\u5916\u6392\u5e8f\u64cd\u4f5c\u3002<\/p>\n<p><strong>\u4f18\u5316<\/strong>\uff1a\u521b\u5efa\u590d\u5408\u7d22\u5f15 <code>(user<em>id, created<\/em>at DESC)<\/code>\u3002<\/p>\n<pre><code class=\"language-sql\">\nCREATE INDEX idx_orders_user_created ON orders (user_id, created_at DESC);\n<\/code><\/pre>\n<p>\u8fd9\u6837\u7d22\u5f15\u53ef\u4ee5\u540c\u65f6\u6ee1\u8db3\u7b49\u503c\u8fc7\u6ee4\u548c\u6392\u5e8f\uff0c\u907f\u514d\u989d\u5916\u6392\u5e8f\u3002<\/p>\n<h3>\u573a\u666f\u4e8c\uff1a\u8303\u56f4\u67e5\u8be2 + \u7b49\u503c\u8fc7\u6ee4<\/h3>\n<p>\u67e5\u8be2\u67d0\u65f6\u95f4\u6bb5\u5185\u72b6\u6001\u4e3a\u201c\u5df2\u652f\u4ed8\u201d\u7684\u8ba2\u5355\uff1a<\/p>\n<pre><code class=\"language-sql\">\nSELECT * FROM orders WHERE created_at BETWEEN &#x27;2023-01-01&#x27; AND &#x27;2023-01-31&#x27; AND status = &#x27;paid&#x27;;\n<\/code><\/pre>\n<p><strong>\u95ee\u9898<\/strong>\uff1a\u5982\u679c\u53ea\u5728 <code>created_at<\/code> \u4e0a\u5efa\u7d22\u5f15\uff0c<code>status<\/code> \u8fc7\u6ee4\u4f1a\u56de\u8868\uff1b\u5982\u679c\u53ea\u5728 <code>status<\/code> \u4e0a\u5efa\u7d22\u5f15\uff0c\u8303\u56f4\u67e5\u8be2\u6548\u7387\u4f4e\u3002<\/p>\n<p><strong>\u4f18\u5316<\/strong>\uff1a\u521b\u5efa\u590d\u5408\u7d22\u5f15 <code>(status, created_at)<\/code>\uff0c\u5c06\u7b49\u503c\u5217\u653e\u5728\u524d\u9762\u3002<\/p>\n<pre><code class=\"language-sql\">\nCREATE INDEX idx_orders_status_created ON orders (status, created_at);\n<\/code><\/pre>\n<p>\u8fd9\u6837\u67e5\u8be2\u65f6\u5148\u901a\u8fc7 <code>status<\/code> \u5feb\u901f\u5b9a\u4f4d\uff0c\u518d\u5728\u7d22\u5f15\u5185\u8fdb\u884c\u8303\u56f4\u626b\u63cf\u3002<\/p>\n<h3>\u573a\u666f\u4e09\uff1a\u90e8\u5206\u7d22\u5f15<\/h3>\n<p>\u5982\u679c\u53ea\u5173\u5fc3\u7279\u5b9a\u72b6\u6001\u7684\u6570\u636e\uff0c\u53ef\u4ee5\u521b\u5efa\u90e8\u5206\u7d22\u5f15\u3002<\/p>\n<pre><code class=\"language-sql\">\nCREATE INDEX idx_orders_paid ON orders (created_at) WHERE status = &#x27;paid&#x27;;\n<\/code><\/pre>\n<p>\u8be5\u7d22\u5f15\u53ea\u5305\u542b <code>status='paid'<\/code> \u7684\u884c\uff0c\u4f53\u79ef\u66f4\u5c0f\uff0c\u7ef4\u62a4\u6210\u672c\u66f4\u4f4e\uff0c\u67e5\u8be2\u901f\u5ea6\u66f4\u5feb\u3002<\/p>\n<h3>\u573a\u666f\u56db\uff1a\u8986\u76d6\u7d22\u5f15<\/h3>\n<p>\u5982\u679c\u67e5\u8be2\u53ea\u9700\u8981\u67d0\u4e9b\u5217\uff0c\u53ef\u4ee5\u5c06\u8fd9\u4e9b\u5217\u5305\u542b\u5728\u7d22\u5f15\u4e2d\uff0c\u907f\u514d\u56de\u8868\u3002<\/p>\n<pre><code class=\"language-sql\">\nCREATE INDEX idx_orders_user_created_status ON orders (user_id, created_at) INCLUDE (status);\n<\/code><\/pre>\n<p>\u8fd9\u6837\u67e5\u8be2 <code>user<em>id<\/code> \u548c <code>created<\/em>at<\/code> \u65f6\uff0c\u53ef\u4ee5\u76f4\u63a5\u4ece\u7d22\u5f15\u83b7\u53d6 <code>status<\/code>\uff0c\u65e0\u9700\u8bbf\u95ee\u8868\u3002<\/p>\n<h2>\u5e38\u89c1\u9677\u9631\u4e0e\u6ce8\u610f\u4e8b\u9879<\/h2>\n<h3>\u9677\u9631\u4e00\uff1a\u7d22\u5f15\u5217\u4e0a\u4f7f\u7528\u51fd\u6570<\/h3>\n<pre><code class=\"language-sql\">\nSELECT * FROM users WHERE lower(email) = &#x27;test@example.com&#x27;;\n<\/code><\/pre>\n<p>\u5982\u679c\u5728 <code>email<\/code> \u4e0a\u5efa\u666e\u901a\u7d22\u5f15\uff0c\u8be5\u67e5\u8be2\u4e0d\u4f1a\u4f7f\u7528\u7d22\u5f15\uff0c\u56e0\u4e3a\u5bf9\u5217\u4f7f\u7528\u4e86\u51fd\u6570\u3002<\/p>\n<p><strong>\u89e3\u51b3\u65b9\u6848<\/strong>\uff1a\u521b\u5efa\u8868\u8fbe\u5f0f\u7d22\u5f15\u3002<\/p>\n<pre><code class=\"language-sql\">\nCREATE INDEX idx_users_lower_email ON users (lower(email));\n<\/code><\/pre>\n<h3>\u9677\u9631\u4e8c\uff1a\u9690\u5f0f\u7c7b\u578b\u8f6c\u6362<\/h3>\n<pre><code class=\"language-sql\">\nSELECT * FROM orders WHERE order_id = &#x27;123&#x27;;\n<\/code><\/pre>\n<p>\u5982\u679c <code>order_id<\/code> \u662f\u6574\u6570\u7c7b\u578b\uff0c\u4f46\u6bd4\u8f83\u65f6\u7528\u4e86\u5b57\u7b26\u4e32\uff0c\u53ef\u80fd\u5bfc\u81f4\u7d22\u5f15\u5931\u6548\u3002\u786e\u4fdd\u7c7b\u578b\u4e00\u81f4\uff0c\u6216\u663e\u5f0f\u8f6c\u6362\u3002<\/p>\n<h3>\u9677\u9631\u4e09\uff1aLIKE \u67e5\u8be2<\/h3>\n<pre><code class=\"language-sql\">\nSELECT * FROM users WHERE name LIKE &#x27;%\u5f20%&#x27;;\n<\/code><\/pre>\n<p>\u524d\u5bfc\u901a\u914d\u7b26\u4f1a\u5bfc\u81f4\u7d22\u5f15\u5931\u6548\u3002\u53ef\u4ee5\u4f7f\u7528 <code>pg_trgm<\/code> \u6269\u5c55\u6765\u4f18\u5316\u3002<\/p>\n<pre><code class=\"language-sql\">\nCREATE EXTENSION pg_trgm;\nCREATE INDEX idx_users_name_trgm ON users USING gin (name gin_trgm_ops);\n<\/code><\/pre>\n<h3>\u9677\u9631\u56db\uff1a\u7d22\u5f15\u8fc7\u591a<\/h3>\n<p>\u6bcf\u4e2a\u7d22\u5f15\u90fd\u4f1a\u589e\u52a0\u5199\u64cd\u4f5c\u5f00\u9500\uff0c\u5e76\u5360\u7528\u78c1\u76d8\u7a7a\u95f4\u3002\u5b9a\u671f\u4f7f\u7528 <code>pg<em>stat<\/em>user_indexes<\/code> \u68c0\u67e5\u7d22\u5f15\u4f7f\u7528\u60c5\u51b5\uff0c\u5220\u9664\u672a\u4f7f\u7528\u7684\u7d22\u5f15\u3002<\/p>\n<pre><code class=\"language-sql\">\nSELECT relname, indexrelname, idx_scan, idx_tup_read\nFROM pg_stat_user_indexes\nORDER BY idx_scan ASC;\n<\/code><\/pre>\n<h2>\u9ad8\u7ea7\u4f18\u5316\u6280\u5de7<\/h2>\n<h3>\u4f7f\u7528 <code>EXPLAIN<\/code> \u7684 <code>BUFFERS<\/code> \u9009\u9879<\/h3>\n<pre><code class=\"language-sql\">\nEXPLAIN (ANALYZE, BUFFERS) SELECT ...;\n<\/code><\/pre>\n<p>\u53ef\u4ee5\u67e5\u770b\u7f13\u5b58\u547d\u4e2d\u60c5\u51b5\uff0c\u5224\u65ad\u662f\u5426\u5168\u8868\u626b\u63cf\u3002<\/p>\n<h3>\u8c03\u6574\u7d22\u5f15\u7684\u586b\u5145\u56e0\u5b50<\/h3>\n<p><code>fillfactor<\/code> \u63a7\u5236\u7d22\u5f15\u9875\u7684\u586b\u5145\u6bd4\u4f8b\uff0c\u9ed8\u8ba4 90\u3002\u5bf9\u4e8e\u66f4\u65b0\u9891\u7e41\u7684\u7d22\u5f15\uff0c\u53ef\u4ee5\u8c03\u4f4e\uff0c\u51cf\u5c11\u9875\u5206\u88c2\uff0c\u4f46\u4f1a\u589e\u52a0\u7d22\u5f15\u5927\u5c0f\u3002<\/p>\n<pre><code class=\"language-sql\">\nCREATE INDEX idx_orders_created ON orders (created_at) WITH (fillfactor = 70);\n<\/code><\/pre>\n<h3>\u5e76\u884c\u7d22\u5f15\u626b\u63cf<\/h3>\n<p>PostgreSQL \u652f\u6301\u5e76\u884c\u7d22\u5f15\u626b\u63cf\uff0c\u5bf9\u4e8e\u5927\u8868\uff0c\u53ef\u4ee5\u8bbe\u7f6e <code>max<em>parallel<\/em>workers<em>per<\/em>gather<\/code> \u53c2\u6570\u3002<\/p>\n<h2>\u603b\u7ed3<\/h2>\n<p>\u7d22\u5f15\u4f18\u5316\u662f\u6570\u636e\u5e93\u6027\u80fd\u8c03\u4f18\u7684\u6838\u5fc3\u3002\u672c\u6587\u4ece\u7d22\u5f15\u7c7b\u578b\u3001EXPLAIN \u5206\u6790\u3001\u5b9e\u6218\u6848\u4f8b\u5230\u5e38\u89c1\u9677\u9631\uff0c\u5168\u9762\u4ecb\u7ecd\u4e86 PostgreSQL \u7d22\u5f15\u4f18\u5316\u7684\u5173\u952e\u6280\u672f\u3002\u8bb0\u4f4f\uff1a\u7d22\u5f15\u4e0d\u662f\u8d8a\u591a\u8d8a\u597d\uff0c\u800c\u662f\u8981\u7528\u5f97\u6070\u5230\u597d\u5904\u3002\u901a\u8fc7\u5408\u7406\u8bbe\u8ba1\u590d\u5408\u7d22\u5f15\u3001\u90e8\u5206\u7d22\u5f15\u548c\u8986\u76d6\u7d22\u5f15\uff0c\u53ef\u4ee5\u5927\u5e45\u63d0\u5347\u67e5\u8be2\u6027\u80fd\u3002<\/p>\n<p>\u4e0b\u4e00\u6b65\uff0c\u4f60\u53ef\u4ee5\u6df1\u5165\u5b66\u4e60 <code>pg<em>hint<\/em>plan<\/code> \u63d2\u4ef6\u6765\u63a7\u5236\u67e5\u8be2\u8ba1\u5212\uff0c\u6216\u8005\u7814\u7a76 <code>BRIN<\/code> 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