{"id":41781,"date":"2022-11-22T00:40:38","date_gmt":"2023-07-14T11:53:02","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90postgre%e3%80%91%e5%a6%82%e4%bd%95%e6%9f%a5%e6%89%bedb%ef%bc%88%e6%a8%a1%e5%bc%8f-%e8%a1%a8%ef%bc%89%e6%9c%80%e5%90%8e%e6%9b%b4%e6%96%b0%e7%9a%84%e6%97%a5%e6%9c%9f%e5%92%8c%e6%97%b6%e9%97%b4\/"},"modified":"2024-04-29T01:51:18","modified_gmt":"2024-04-28T17:51:18","slug":"%e3%80%90postgre%e3%80%91%e5%a6%82%e4%bd%95%e6%9f%a5%e6%89%bedb%ef%bc%88%e6%a8%a1%e5%bc%8f-%e8%a1%a8%ef%bc%89%e6%9c%80%e5%90%8e%e6%9b%b4%e6%96%b0%e7%9a%84%e6%97%a5%e6%9c%9f%e5%92%8c%e6%97%b6%e9%97%b4","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90postgre%e3%80%91%e5%a6%82%e4%bd%95%e6%9f%a5%e6%89%bedb%ef%bc%88%e6%a8%a1%e5%bc%8f-%e8%a1%a8%ef%bc%89%e6%9c%80%e5%90%8e%e6%9b%b4%e6%96%b0%e7%9a%84%e6%97%a5%e6%9c%9f%e5%92%8c%e6%97%b6%e9%97%b4\/","title":{"rendered":"\u3010Postgre\u3011\u5982\u4f55\u67e5\u627eDB\uff08\u6a21\u5f0f\/\u8868\uff09\u6700\u540e\u66f4\u65b0\u7684\u65e5\u671f\u548c\u65f6\u95f4\uff08\u5206\u6790\u548c\u6e05\u7406\u662f\u4ec0\u4e48\uff1f\uff09"},"content":{"rendered":"<h1>\u7b80\u8981\u6982\u8ff0<\/h1>\n<p>\u5728PostgreSQL\u4e2d\uff0c\u6211\u4eec\u5c06\u4ecb\u7ecd\u5982\u4f55\u67e5\u627e\u67d0\u4e2aDB\u6a21\u5f0f\u6216\u8868\u7684\u6700\u540e\u66f4\u65b0\u65f6\u95f4\u3002<\/p>\n<h1>\u6267\u884c\u65b9\u6cd5<\/h1>\n<p>PostgreSQL\u63d0\u4f9b\u4e86\u4e00\u4e2a\u540d\u4e3apg_stat_user_tables\u7684\u7cfb\u7edf\u89c6\u56fe\uff0c\u7528\u4e8e\u63d0\u4f9b\u8868\u7684\u7edf\u8ba1\u4fe1\u606f\u3002\u4f7f\u7528\u8fd9\u4e2a\u89c6\u56fe\uff0c\u53ef\u4ee5\u67e5\u770b\u8868\u7684\u6700\u540e\u66f4\u65b0\u65f6\u95f4\u3002<\/p>\n<p>\u4ee5\u4ee5\u4e0b\u5f62\u5f0f\u6267\u884cSQL\uff1a<br \/>\npg_stat_user_tables\u662fPostgreSQL\u5185\u90e8\u7684\u7cfb\u7edf\u76ee\u5f55\u89c6\u56fe\u4e4b\u4e00\uff0c\u5305\u542b\u7edf\u8ba1\u4fe1\u606f\u3002<br \/>\n\u5c06\u76f8\u5173\u7684\u8868\u653e\u5165relname\u4e2d\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">SELECT<\/span> <span class=\"n\">relname<\/span><span class=\"p\">,<\/span> <span class=\"n\">last_autoanalyze<\/span><span class=\"p\">,<\/span> <span class=\"n\">last_autovacuum<\/span><span class=\"p\">,<\/span> <span class=\"n\">last_analyze<\/span><span class=\"p\">,<\/span> <span class=\"n\">last_vacuum<\/span>\r\n<span class=\"k\">FROM<\/span> <span class=\"n\">pg_stat_user_tables<\/span>\r\n<span class=\"k\">WHERE<\/span> <span class=\"n\">relname<\/span> <span class=\"o\">=<\/span> <span class=\"s1\">'sample'<\/span><span class=\"p\">;<\/span>\r\n<\/code><\/pre>\n<p>\u7ed3\u679c\uff0c\u7ed3\u679c\u5982\u4e0b\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d48b637434c4406caca26\/7-0.png\" alt=\"image.png\" \/><\/div>\n<p>\u5982\u679c\u8981\u5728\u6574\u4e2a\u67b6\u6784\u4e2d\u6267\u884c\uff0c\u8bf7\u6267\u884c\u4ee5\u4e0b\u64cd\u4f5c\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">SELECT<\/span> <span class=\"n\">schemaname<\/span><span class=\"p\">,<\/span> <span class=\"n\">relname<\/span><span class=\"p\">,<\/span> <span class=\"n\">last_autoanalyze<\/span><span class=\"p\">,<\/span> <span class=\"n\">last_autovacuum<\/span><span class=\"p\">,<\/span> <span class=\"n\">last_analyze<\/span><span class=\"p\">,<\/span> <span class=\"n\">last_vacuum<\/span>\r\n<span class=\"k\">FROM<\/span> <span class=\"n\">pg_stat_all_tables<\/span>\r\n<span class=\"k\">WHERE<\/span> <span class=\"n\">schemaname<\/span> <span class=\"o\">=<\/span> <span class=\"s1\">'public'<\/span>\r\n<\/code><\/pre>\n<p>\u901a\u8fc7\u8fd9\u4e2a\uff0c\u4f60\u53ef\u4ee5\u5728\u6bcf\u5f20\u8868\u4e2d\u77e5\u9053\u6700\u540e\u66f4\u65b0\u7684\u65e5\u671f\u548c\u65f6\u95f4\u3002<\/p>\n<h2>\u81ea\u52d5\u89e3\u6790\u548c\u81ea\u52d5\u5438\u5875\u662f\u4ec0\u9ebc\uff1f<\/h2>\n<p>\u4ee5\u4e0a\u63cf\u8ff0\u4e2d\uff0c\u8bb0\u5f55\u4e86\u9488\u5bf9\u8868\u683c\u8fdb\u884c\u7684\u6700\u8fd1\u4e00\u6b21\u81ea\u52a8\u5206\u6790\u548c\u81ea\u52a8VACUUM\u7b49\u64cd\u4f5c\u7684\u65e5\u671f\u548c\u65f6\u95f4\uff0c\u5206\u522b\u4fdd\u5b58\u5728\u540d\u4e3alast_autoanalyze\u548clast_autovacuum\u7684\u5217\u4e2d\u3002<\/p>\n<p>\u90a3\u4e48\uff0c\u4ec0\u4e48\u662f\u81ea\u52a8\u89e3\u6790\u548c\u81ea\u52a8\u5438\u5c18\uff1f<\/p>\n<p>PostgreSQL VACUUM\u53caANALYZE\u6700\u4f73\u5b9e\u8df5\u6280\u5de7<\/p>\n<p>\u4ee5\u4e0a\u5185\u5bb9\u662f\u6709\u5173\u82f1\u6587\u7f51\u7ad9\u7684\u8be6\u7ec6\u63cf\u8ff0\u3002<\/p>\n<p>PostgreSQL\u4e2d\u6709\u4e24\u4e2a\u91cd\u8981\u7684\u529f\u80fd\uff0c\u81ea\u52a8\u89e3\u6790\u548c\u81ea\u52a8\u6e05\u7406\uff0c\u5b83\u4eec\u90fd\u662f\u4e3a\u4e86\u4fdd\u6301\u6570\u636e\u5e93\u7684\u6027\u80fd\u800c\u5b58\u5728\u7684\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u81ea\u52d5\u89e3\u6790\uff1aPostgreSQL\u304c\u30c6\u30fc\u30d6\u30eb\u306e\u7d71\u8a08\u60c5\u5831\uff08statistics)\u3092\u81ea\u52d5\u7684\u306b\u66f4\u65b0\u3059\u308b\u30d7\u30ed\u30bb\u30b9<\/ul>\n<\/li>\n<\/ul>\n<p>\u7d71\u8a08\u60c5\u5831\u3068\u306f\uff1a\u30c6\u30fc\u30d6\u30eb\u5185\u306e\u30c7\u30fc\u30bf\u306e\u5206\u5e03\u3084\u5024\u306e\u7bc4\u56f2\u306a\u3069\u3092\u793a\u3059\u3082\u306e\u3067\u3001\u30af\u30a8\u30ea\u30d7\u30e9\u30f3\u30ca\u30fc\u304c\u30af\u30a8\u30ea\u306e\u6700\u9069\u306a\u5b9f\u884c\u8a08\u753b\u3092\u6c7a\u5b9a\u3059\u308b\u969b\u306b\u4f7f\u7528\u3055\u308c\u308b(=\u30d9\u30b9\u30c8\u306a\u30af\u30a8\u30ea\u30d7\u30e9\u30f3\u306e\u305f\u3081\u306b\u4f7f\u308f\u308c\u308b\u3001\u3063\u3066\u3053\u3068\u3067\u3059\u306d)<br \/>\n\u30c6\u30fc\u30d6\u30eb\u5185\u306e\u30c7\u30fc\u30bf\u304c\u4e00\u5b9a\u306e\u5909\u66f4\u91cf\u3092\u8d85\u3048\u305f\u5834\u5408\u306b\u30c8\u30ea\u30ac\u30fc\u3055\u308c\u308b<\/p>\n<blockquote><p>\u4e00\u4e2a&#8221;\u5206\u6790&#8221;\u64cd\u4f5c\u5c31\u5982\u5176\u540d\u6240\u793a &#8211; \u5b83\u5206\u6790\u6570\u636e\u5e93\u8868\u7684\u5185\u5bb9\uff0c\u5e76\u6536\u96c6\u6bcf\u4e2a\u8868\u6bcf\u5217\u6570\u503c\u7684\u5206\u5e03\u7edf\u8ba1\u4fe1\u606f\u3002PostgreSQL\u67e5\u8be2\u5f15\u64ce\u4f7f\u7528\u8fd9\u4e9b\u7edf\u8ba1\u4fe1\u606f\u6765\u627e\u5230\u6700\u4f73\u7684\u67e5\u8be2\u8ba1\u5212\u3002\u968f\u7740\u5728\u6570\u636e\u5e93\u4e2d\u63d2\u5165\u3001\u5220\u9664\u548c\u66f4\u65b0\u884c\uff0c\u5217\u7edf\u8ba1\u4fe1\u606f\u4e5f\u4f1a\u6539\u53d8\u3002&#8221;\u5206\u6790&#8221;\u64cd\u4f5c &#8211; \u65e0\u8bba\u662f\u7531\u6570\u636e\u5e93\u7ba1\u7406\u5458\u624b\u52a8\u8fd0\u884c\u8fd8\u662f\u5728\u81ea\u52a8\u6e05\u7406\u540e\u7531PostgreSQL\u81ea\u52a8\u8fd0\u884c &#8211; \u786e\u4fdd\u7edf\u8ba1\u4fe1\u606f\u662f\u6700\u65b0\u7684\u3002<\/p><\/blockquote>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u81ea\u52d5\u30d0\u30ad\u30e5\u30fc\u30e0\uff1a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u5185\u306e\u4e0d\u8981\u306a\u30c7\u30fc\u30bf\u3084\u884c\u3092\u524a\u9664\u3057\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u5bb9\u91cf\u3092\u6700\u9069\u5316\u3059\u308b\u30d7\u30ed\u30bb\u30b9<\/ul>\n<\/li>\n<\/ul>\n<p>\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u5185\u306e\u884c\u306e\u66f4\u65b0\u3084\u524a\u9664\u306b\u3088\u308a\u3001\u4e0d\u8981\u306aDead Rows\uff08dead tuples\uff09\u304c\u6b8b\u308b\u3053\u3068\u304c\u3042\u308b\u3002\u3053\u308c\u306f\u3001PostgreSQL\u304cMVCC\uff08Multi-Version Concurrency Control\uff09\u3068\u547c\u3070\u308c\u308b\u4ed5\u7d44\u307f\u3092\u4f7f\u7528\u3057\u3066\u304a\u308a\u3001\u524a\u9664\u3055\u308c\u305f\u884c\u3082\u5b9f\u969b\u306b\u306f\u7269\u7406\u7684\u306b\u524a\u9664\u3055\u308c\u305a\u306b\u6b8b\u308b\u305f\u3081\u3002\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u304c\u4e0d\u5fc5\u8981\u306b\u80a5\u5927\u5316\u3057\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u4f4e\u4e0b\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u305f\u3081\u3001\u81ea\u52d5\u30d0\u30ad\u30e5\u30fc\u30e0\u306b\u3088\u3063\u3066\u30af\u30ea\u30fc\u30f3\u30a2\u30c3\u30d7\u3092\u884c\u3046\u3002<br \/>\nPostgreSQL\u306f\u53e4\u3044\u884c\u3092\u7269\u7406\u7684\u306b\u30c6\u30fc\u30d6\u30eb\u304b\u3089\u524a\u9664\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u305d\u308c\u306b&#8221;marker&#8221;\u306e\u3088\u3046\u306a\u3082\u306e\u3092\u4ed8\u3051\u3066\u30af\u30a8\u30ea\u304c\u305d\u306e\u884c\u3092\u8fd4\u3055\u306a\u3044\u3088\u3046\u306b\u3057\u3066\u3044\u308b<br \/>\n\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u306e\u6574\u7406\u3082\u884c\u3046\u3002\u9577\u671f\u9593\u306b\u308f\u305f\u3063\u3066\u5b9f\u884c\u3055\u308c\u308b\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u304c\u5897\u3048\u308b\u3068\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u5f71\u97ff\u3092\u53ca\u307c\u3059\u53ef\u80fd\u6027\u304c\u3042\u308b\u305f\u3081\u3001\u4e0d\u8981\u306a\u53e4\u3044\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u306b\u95a2\u9023\u3059\u308b\u60c5\u5831\u3092\u524a\u9664\u3057\u3066\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u52b9\u7387\u3092\u5411\u4e0a\u3055\u305b\u308b\u3002<br \/>\n\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u5185\u3067\u4e00\u5b9a\u306e\u3057\u304d\u3044\u5024\u3092\u8d85\u3048\u305f\u5834\u5408\u306b\u30c8\u30ea\u30ac\u30fc\u3055\u308c\u308b<\/p>\n<blockquote><p>\u5728\u8868\u4e2d\u4f7f\u7528\u771f\u7a7a\u6765\u6062\u590d\u88ab\u201c\u6b7b\u5143\u7ec4\u201d\u5360\u7528\u7684\u7a7a\u95f4\u3002\u5f53\u8bb0\u5f55\u88ab\u5220\u9664\u6216\u66f4\u65b0\u65f6\uff08\u5148\u5220\u9664\u518d\u63d2\u5165\uff09\uff0c\u5c31\u4f1a\u521b\u5efa\u4e00\u4e2a\u6b7b\u5143\u7ec4\u3002PostgreSQL\u5e76\u4e0d\u4f1a\u5c06\u65e7\u884c\u4ece\u8868\u4e2d\u7269\u7406\u5220\u9664\uff0c\u800c\u662f\u5728\u5176\u4e0a\u653e\u7f6e\u4e00\u4e2a\u201c\u6807\u8bb0\u201d\uff0c\u4ee5\u9632\u67e5\u8be2\u8fd4\u56de\u8be5\u884c\u3002\u5f53\u8fdb\u884c\u771f\u7a7a\u5904\u7406\u65f6\uff0c\u8fd9\u4e9b\u6b7b\u5143\u7ec4\u6240\u5360\u7528\u7684\u7a7a\u95f4\u4f1a\u88ab\u6807\u8bb0\u4e3a\u53ef\u4f9b\u5176\u4ed6\u5143\u7ec4\u91cd\u7528\u7684\u7a7a\u95f4\u3002<\/p><\/blockquote>\n<p>\u8fd8\u6709\u4e00\u79cd\u65b9\u6cd5\u662f\u786e\u5b9a\u6bcf\u4e2a\u7279\u5b9a\u7684\u9608\u503c\u6765\u542f\u52a8\u3002<br \/>\n\u6839\u636e\u5148\u524d\u7684\u7f51\u7ad9\u4e0a\u7684\u6700\u4f73\u5b9e\u8df5\uff0c\u201cFine-tune Autovacuum Threshold\u201d\u4e5f\u63d0\u5230\u4e86\u81ea\u5b9a\u4e49\u9608\u503c\u7684\u91cd\u8981\u6027\u3002<\/p>\n<h3>\u83b7\u53d6ANALYZE\u9608\u503c\u4fe1\u606f\u7684SQL\u67e5\u8be2<\/h3>\n<pre class=\"post-pre\"><code><span class=\"k\">SELECT<\/span> <span class=\"n\">name<\/span><span class=\"p\">,<\/span> <span class=\"n\">setting<\/span>\r\n<span class=\"k\">FROM<\/span> <span class=\"n\">pg_settings<\/span>\r\n<span class=\"k\">WHERE<\/span> <span class=\"n\">name<\/span> <span class=\"o\">=<\/span> <span class=\"s1\">'autovacuum_analyze_scale_factor'<\/span>\r\n   <span class=\"k\">OR<\/span> <span class=\"n\">name<\/span> <span class=\"o\">=<\/span> <span class=\"s1\">'autovacuum_analyze_threshold'<\/span><span class=\"p\">;<\/span>\r\n\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d48b637434c4406caca26\/24-0.png\" alt=\"image.png\" \/><\/div>\n<p>\u5982\u679c\u8868\u683c\u7684\u884c\u6570\u8d85\u8fc710%\uff0c \u6216\u8005\u884c\u6570\u8d85\u8fc750\u884c\u7684\u60c5\u51b5\u3002<\/p>\n<h3>\u83b7\u53d6\u81ea\u52a8\u5438\u5c18\u5668\u95e8\u9650\u4fe1\u606f\u7684SQL\u67e5\u8be2\u3002<\/h3>\n<pre class=\"post-pre\"><code><span class=\"k\">SELECT<\/span> <span class=\"n\">name<\/span><span class=\"p\">,<\/span> <span class=\"n\">setting<\/span>\r\n<span class=\"k\">FROM<\/span> <span class=\"n\">pg_settings<\/span>\r\n<span class=\"k\">WHERE<\/span> <span class=\"n\">name<\/span> <span class=\"o\">=<\/span> <span class=\"s1\">'autovacuum_vacuum_scale_factor'<\/span>\r\n   <span class=\"k\">OR<\/span> <span class=\"n\">name<\/span> <span class=\"o\">=<\/span> <span class=\"s1\">'autovacuum_vacuum_threshold'<\/span><span class=\"p\">;<\/span>\r\n\r\n<\/code><\/pre>\n<div><img decoding=\"async\" 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