{"id":41896,"date":"2023-07-13T03:45:19","date_gmt":"2023-04-13T07:25:31","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/postgresql-%e7%b4%a2%e5%bc%95%e8%a7%a3%e6%9e%90%e7%ac%94%e8%ae%b0\/"},"modified":"2024-04-30T13:18:23","modified_gmt":"2024-04-30T05:18:23","slug":"postgresql-%e7%b4%a2%e5%bc%95%e8%a7%a3%e6%9e%90%e7%ac%94%e8%ae%b0","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/postgresql-%e7%b4%a2%e5%bc%95%e8%a7%a3%e6%9e%90%e7%ac%94%e8%ae%b0\/","title":{"rendered":"PostgreSQL \u7d22\u5f15\u89e3\u6790\u7b14\u8bb0"},"content":{"rendered":"<p>\u4ee5\u4e0b\u662f\u5173\u4e8e PostgreSQL \u7d22\u5f15\u7684\u5907\u5fd8\u5f55\u3002<br \/>\n\u5728\u521b\u5efa\u7d22\u5f15\u540e\uff0c\u6709\u65f6\u9700\u8981\u68c0\u67e5\u7d22\u5f15\u662f\u5426\u6709\u6548\uff0c\u53ef\u4ee5\u67e5\u770b\u6267\u884c\u8ba1\u5212\uff08Plan\uff09\u6765\u786e\u8ba4\u3002<br \/>\n\u6211\u5411 ChatGPT \u8be2\u95ee\u4e86\u5982\u679c\u51fa\u73b0\u4ec0\u4e48\u6837\u7684\u65e5\u5fd7\u8be5\u5982\u4f55\u5904\u7406\uff0c\u4f9b\u6ca1\u6709 ChatGPT \u8d26\u6237\u7684\u4eba\u53c2\u8003\u3002<\/p>\n<p>\u25c7 \u95ee\u9898<br \/>\n\u8bf7\u544a\u8bc9\u6211\u5982\u4f55\u901a\u8fc7\u4f7f\u7528&#8221;explain analyze&#8221;\u6765\u67e5\u770bpostgresql\u7d22\u5f15\u7684\u6267\u884c\u8ba1\u5212\uff0c\u4ee5\u53ca\u5f53\u6267\u884c\u8ba1\u5212\u8f83\u6162\u6216\u9700\u8981\u5220\u9664\u67d0\u4e2a\u7d22\u5f15\u65f6\uff0c\u5982\u4f55\u8bb0\u5f55\u76f8\u5173\u65e5\u5fd7\u3002<\/p>\n<p>\u25c7 ChatGPT\u7684\u56de\u7b54<br \/>\n\u5982\u679c\u8981\u67e5\u770bPostgreSQL\u7684\u7d22\u5f15\u6267\u884c\u8ba1\u5212\uff0c\u53ef\u4ee5\u4f7f\u7528&#8221;EXPLAIN ANALYZE&#8221;\u547d\u4ee4\u3002\u4ee5\u4e0b\u662f\u7d22\u5f15\u901f\u5ea6\u8f83\u6162\u6216\u9700\u8981\u5220\u9664\u7d22\u5f15\u7684\u65e5\u5fd7\u793a\u4f8b\u3002<br \/>\n\u25cf\u7d22\u5f15\u901f\u5ea6\u8f83\u6162\u7684\u65e5\u5fd7\u793a\u4f8b<\/p>\n<pre class=\"post-pre\"><code>QUERY PLAN\r\n\r\nIndex Only Scan using idx_name on table_name (cost=0.43..8.45 rows=1 width=34) (actual time=0.014..0.015 rows=1 loops=1)\r\nIndex Cond: (name = 'example'::text)\r\nHeap Fetches: 1\r\nPlanning time: 0.106 ms\r\nExecution time: 0.031 ms\r\n<\/code><\/pre>\n<p>\u5982\u679c&#8221;Index Only Scan&#8221;\u7684&#8221;cost&#8221;\u6216\u8005&#8221;actual time&#8221;\u8f83\u9ad8\uff0c\u8fd9\u8868\u660e\u7d22\u5f15\u8f83\u6162\u3002<br \/>\n\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u901a\u8fc7\u91cd\u65b0\u521b\u5efa\u7d22\u5f15\u6216\u521b\u5efa\u9002\u5f53\u7684\u7d22\u5f15\u6765\u52a0\u901f\u67e5\u8be2\u7684\u6267\u884c\u3002<\/p>\n<p>\u5f53\u9700\u8981\u5220\u9664\u7d22\u5f15\u65f6\uff0c\u4ee5\u4e0b\u662f\u793a\u4f8b\u65e5\u5fd7\uff1a\u67e5\u8be2\u8ba1\u5212\u3002<\/p>\n<pre class=\"post-pre\"><code>Seq Scan on table_name (cost=0.00..5558.80 rows=50000 width=10) (actual time=40.782..215.912 rows=50000 loops=1)\r\nFilter: (col1 = 1)\r\nRows Removed by Filter: 500000\r\nPlanning time: 0.086 ms\r\nExecution time: 326.343 ms\r\n<\/code><\/pre>\n<p>\u5982\u679c\u201cSeq Scan\u201d\u64cd\u4f5c\u7684\u201ccost\u201d\u8f83\u4f4e\u4e14\u5b58\u5728\u201cFilter\u201d\uff0c\u5219\u8bf4\u660e\u7d22\u5f15\u4e0d\u8d77\u4f5c\u7528\u3002<br \/>\n\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u901a\u8fc7\u5220\u9664\u7d22\u5f15\u6765\u52a0\u901f\u67e5\u8be2\u6267\u884c\u3002\u4f46\u662f\uff0c\u5efa\u8bae\u5728\u9700\u8981\u7684\u60c5\u51b5\u4e0b\u521b\u5efa\u7d22\u5f15\u7684\u5907\u4efd\u3002<\/p>\n<p>\u25c7 \u6211\u8fd8\u60f3\u4e86\u89e3\u5176\u4ed6\u7684\u89e3\u91ca\u548c\u5206\u6790\u65e5\u5fd7\uff0c\u8bf7\u7ed9\u6211\u5176\u4ed6\u7684 explain analyze \u65e5\u5fd7\u3002<\/p>\n<p>\u5982\u679c\u8981\u68c0\u67e5 PostgreSQL \u4e2d\u7d22\u5f15\u7684\u6267\u884c\u8ba1\u5212\uff0c\u53ef\u4ee5\u4f7f\u7528 &#8220;EXPLAIN ANALYZE&#8221; \u547d\u4ee4\u3002\u4ee5\u4e0b\u662f\u5176\u4ed6\u65e5\u5fd7\u793a\u4f8b\u3002<\/p>\n<pre class=\"post-pre\"><code>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u4f7f\u7528\u3057\u305f\u30af\u30a8\u30ea\u306e\u30ed\u30b0\u4f8b\r\nQUERY PLAN\r\n\r\nIndex Scan using idx_col1_col2 on table_name (cost=0.43..8.45 rows=1 width=34) (actual time=0.014..0.015 rows=1 loops=1)\r\nIndex Cond: ((col1 = 1) AND (col2 = 'example'::text))\r\nPlanning time: 0.106 ms\r\nExecution time: 0.031 ms\r\n<\/code><\/pre>\n<p>\u5982\u679c\u5bf9\u4e8e&#8221;\u7d22\u5f15\u626b\u63cf&#8221;\uff0c&#8221;\u6210\u672c&#8221;\u548c&#8221;\u5b9e\u9645\u65f6\u95f4&#8221;\u8f83\u4f4e\uff0c\u5219\u8868\u793a\u7d22\u5f15\u662f\u6709\u6548\u7684\u3002<\/p>\n<pre class=\"post-pre\"><code>\u30af\u30a8\u30ea\u306e\u5b9f\u884c\u8a08\u753b\u306b\u8907\u6570\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u4f7f\u7528\u3055\u308c\u308b\u5834\u5408\u306e\u30ed\u30b0\u4f8b\r\nQUERY PLAN\r\n\r\nHash Join (cost=20.17..57.11 rows=2 width=12) (actual time=1.059..1.069 rows=1 loops=1)\r\nHash Cond: (table1.col1 = table2.col1)\r\n-&gt; Bitmap Heap Scan on table1 (cost=10.03..30.25 rows=2 width=8) (actual time=0.518..0.524 rows=1 loops=1)\r\nRecheck Cond: (col2 = 'example'::text)\r\nHeap Blocks: exact=1\r\n-&gt; Bitmap Index Scan on idx_table1_col2 (cost=0.00..10.03 rows=2 width=0) (actual time=0.332..0.332 rows=1 loops=1)\r\nIndex Cond: (col2 = 'example'::text)\r\n-&gt; Hash (cost=10.10..10.10 rows=6 width=8) (actual time=0.521..0.521 rows=6 loops=1)\r\nBuckets: 1024 Batches: 1 Memory Usage: 9kB\r\n-&gt; Index Scan using idx_table2_col1 on table2 (cost=0.28..10.10 rows=6 width=8) (actual time=0.048..0.505 rows=6 loops=1)\r\nPlanning time: 0.132 ms\r\nExecution time: 1.105 ms\r\n<\/code><\/pre>\n<p>\u5982\u679c\u4f7f\u7528\u4e86\u591a\u4e2a\u7d22\u5f15\uff0c\u5219\u4f1a\u51fa\u73b0\u591a\u4e2a&#8221;Index Scan&#8221;\u548c&#8221;Bitmap Index Scan&#8221;\u3002<br \/>\n\u5982\u679c&#8221;Hash Join&#8221;\u7684\u6210\u672c\u5f88\u9ad8\uff0c\u53ef\u4ee5\u901a\u8fc7\u6539\u5584\u7d22\u5f15\u6765\u52a0\u5feb\u67e5\u8be2\u7684\u6267\u884c\u901f\u5ea6\u3002<\/p>\n<p>\u5982\u679c\u5728PostgreSQL\u4e2d\u6ca1\u6709\u7d22\u5f15\uff0c\u67e5\u8be2\u6267\u884c\u7684\u65e5\u5fd7\u793a\u4f8b\u5982\u4e0b\u3002<br \/>\n\u67e5\u8be2\u8ba1\u5212<\/p>\n<p>\u5728\u8868\u540d\u4e0a\u9032\u884c\u9806\u5e8f\u6383\u63cf\uff08\u6210\u672c=0.00..20.00\uff0c\u884c\u6578=1\uff0c\u5bec\u5ea6=34\uff09\uff08\u5be6\u969b\u6642\u9593=0.050..0.055\uff0c\u884c\u6578=1\uff0c\u5faa\u74b0\u6b21\u6578=1\uff09<br \/>\n\u904e\u6ffe\u689d\u4ef6\uff1a\uff08col1 = 1\uff09\u4e14\uff08col2 = &#8216;example&#8217;::text\uff09<br \/>\n\u88ab\u904e\u6ffe\u5668\u79fb\u9664\u7684\u884c\u6578\uff1a9999<br \/>\n\u8a08\u5283\u6642\u9593\uff1a0.052\u6beb\u79d2<br \/>\n\u57f7\u884c\u6642\u9593\uff1a0.068\u6beb\u79d2<\/p>\n<p>\u901a\u8fc7&#8221;Seq Scan&#8221;\u64cd\u4f5c\uff0c\u6211\u4eec\u53ef\u4ee5\u53d1\u73b0\u5b83\u5728\u626b\u63cf\u8868\u7684\u6240\u6709\u884c\u3002<br \/>\n&#8220;cost&#8221;\u7684\u8303\u56f4\u4ece0.00\u523020.00\u4e0d\u7b49\uff0c\u5982\u679c\u6ca1\u6709\u7d22\u5f15\uff0c\u5219\u9700\u8981\u626b\u63cf\u8868\u7684\u6240\u6709\u884c\uff0c\u5bfc\u81f4\u6210\u672c\u8f83\u9ad8\u3002<br \/>\n\u5982\u679c\u7f3a\u4e4f\u7d22\u5f15\uff0c\u53ef\u80fd\u4f1a\u5f71\u54cd\u6027\u80fd\uff0c\u56e0\u6b64\u6b63\u786e\u8bbe\u7f6e\u7d22\u5f15\u975e\u5e38\u91cd\u8981\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4ee5\u4e0b\u662f\u5173\u4e8e PostgreSQL \u7d22\u5f15\u7684\u5907\u5fd8\u5f55\u3002 \u5728\u521b\u5efa\u7d22\u5f15\u540e\uff0c\u6709\u65f6\u9700\u8981\u68c0\u67e5\u7d22\u5f15\u662f\u5426\u6709\u6548\uff0c\u53ef\u4ee5\u67e5\u770b\u6267\u884c\u8ba1\u5212\uff08P [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-41896","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>PostgreSQL \u7d22\u5f15\u89e3\u6790\u7b14\u8bb0 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/postgresql-\u7d22\u5f15\u89e3\u6790\u7b14\u8bb0\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PostgreSQL \u7d22\u5f15\u89e3\u6790\u7b14\u8bb0\" \/>\n<meta property=\"og:description\" content=\"\u4ee5\u4e0b\u662f\u5173\u4e8e PostgreSQL \u7d22\u5f15\u7684\u5907\u5fd8\u5f55\u3002 \u5728\u521b\u5efa\u7d22\u5f15\u540e\uff0c\u6709\u65f6\u9700\u8981\u68c0\u67e5\u7d22\u5f15\u662f\u5426\u6709\u6548\uff0c\u53ef\u4ee5\u67e5\u770b\u6267\u884c\u8ba1\u5212\uff08P [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/postgresql-\u7d22\u5f15\u89e3\u6790\u7b14\u8bb0\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2023-04-13T07:25:31+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-04-30T05:18:23+00:00\" \/>\n<meta name=\"author\" content=\"\u65b0, \u97f5\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u65b0, \u97f5\" \/>\n\t<meta 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