{"id":179072,"date":"2024-11-08T22:46:18","date_gmt":"2024-11-08T14:46:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/179072\/"},"modified":"2024-11-08T22:46:19","modified_gmt":"2024-11-08T14:46:19","slug":"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9-postgresql-%e9%8c%af%e8%aa%a4%e4%bb%a3%e7%a2%bc%ef%bc%9a53300-too_many_connections%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/179072\/","title":{"rendered":"\u5982\u4f55\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1a53300 &#8211; too_many_connections\uff1f"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9-postgresql-%e9%8c%af%e8%aa%a4%e4%bb%a3%e7%a2%bc%ef%bc%9a53300-too_many_connections-ijVOxIpVpW\">\u5982\u4f55\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc\uff1a53300 &#8211; too_many_connections<\/h1>\n<p>\u5728\u4f7f\u7528 PostgreSQL \u6578\u64da\u5eab\u6642\uff0c\u958b\u767c\u8005\u548c\u7cfb\u7d71\u7ba1\u7406\u54e1\u53ef\u80fd\u6703\u9047\u5230\u5404\u7a2e\u932f\u8aa4\u4ee3\u78bc\uff0c\u5176\u4e2d\u4e4b\u4e00\u5c31\u662f\u932f\u8aa4\u4ee3\u78bc 53300\uff0c\u8868\u793a\u300ctoo_many_connections\u300d\u3002\u9019\u500b\u932f\u8aa4\u901a\u5e38\u767c\u751f\u5728\u6578\u64da\u5eab\u7684\u9023\u63a5\u6578\u8d85\u904e\u4e86\u8a2d\u5b9a\u7684\u6700\u5927\u9650\u5236\u6642\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u6b64\u932f\u8aa4\u7684\u539f\u56e0\u53ca\u5176\u89e3\u6c7a\u65b9\u6848\u3002<\/p>\n<h2 id=\"%e9%8c%af%e8%aa%a4%e5%8e%9f%e5%9b%a0-ijVOxIpVpW\">\u932f\u8aa4\u539f\u56e0<\/h2>\n<p>PostgreSQL \u7684\u9023\u63a5\u6578\u9650\u5236\u662f\u7531\u914d\u7f6e\u6587\u4ef6\u4e2d\u7684\u53c3\u6578 <code>max_connections<\/code> \u63a7\u5236\u7684\u3002\u7576\u540c\u6642\u9023\u63a5\u5230\u6578\u64da\u5eab\u7684\u5ba2\u6236\u7aef\u6578\u91cf\u8d85\u904e\u9019\u500b\u9650\u5236\u6642\uff0c\u5c31\u6703\u51fa\u73fe\u932f\u8aa4 53300\u3002\u9019\u53ef\u80fd\u662f\u7531\u65bc\u4ee5\u4e0b\u5e7e\u500b\u539f\u56e0\u9020\u6210\u7684\uff1a<\/p>\n<ul>\n<li><strong>\u61c9\u7528\u7a0b\u5e8f\u8a2d\u8a08\u4e0d\u7576\uff1a<\/strong>\u67d0\u4e9b\u61c9\u7528\u7a0b\u5e8f\u53ef\u80fd\u5728\u4e0d\u5fc5\u8981\u7684\u60c5\u6cc1\u4e0b\u4fdd\u6301\u9023\u63a5\uff0c\u5c0e\u81f4\u9023\u63a5\u6578\u8fc5\u901f\u589e\u52a0\u3002<\/li>\n<li><strong>\u9023\u63a5\u6c60\u914d\u7f6e\u4e0d\u7576\uff1a<\/strong>\u5982\u679c\u4f7f\u7528\u4e86\u9023\u63a5\u6c60\uff0c\u4f46\u914d\u7f6e\u4e0d\u7576\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u904e\u591a\u7684\u9023\u63a5\u88ab\u5275\u5efa\u3002<\/li>\n<li><strong>\u9ad8\u6d41\u91cf\uff1a<\/strong>\u5728\u9ad8\u6d41\u91cf\u7684\u60c5\u6cc1\u4e0b\uff0c\u77ed\u6642\u9593\u5167\u53ef\u80fd\u6703\u6709\u5927\u91cf\u7684\u9023\u63a5\u8acb\u6c42\u3002<\/li>\n<\/ul>\n<h2 id=\"%e8%a7%a3%e6%b1%ba%e6%96%b9%e6%a1%88-ijVOxIpVpW\">\u89e3\u6c7a\u65b9\u6848<\/h2>\n<p>\u8981\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc 53300\uff0c\u53ef\u4ee5\u8003\u616e\u4ee5\u4e0b\u5e7e\u7a2e\u65b9\u6cd5\uff1a<\/p>\n<h3 id=\"1-%e5%a2%9e%e5%8a%a0-max_connections-%e8%a8%ad%e5%ae%9a-ijVOxIpVpW\">1. \u589e\u52a0 max_connections \u8a2d\u5b9a<\/h3>\n<p>\u5982\u679c\u60a8\u7684\u61c9\u7528\u7a0b\u5e8f\u78ba\u5be6\u9700\u8981\u66f4\u591a\u7684\u9023\u63a5\uff0c\u53ef\u4ee5\u901a\u904e\u4fee\u6539 PostgreSQL \u7684\u914d\u7f6e\u6587\u4ef6\u4f86\u589e\u52a0 <code>max_connections<\/code> \u7684\u503c\u3002\u4ee5\u4e0b\u662f\u5177\u9ad4\u6b65\u9a5f\uff1a<\/p>\n<pre><code>1. \u6253\u958b PostgreSQL \u7684\u914d\u7f6e\u6587\u4ef6\uff0c\u901a\u5e38\u4f4d\u65bc <code>\/etc\/postgresql\/{version}\/main\/postgresql.conf<\/code>\u3002\n2. \u627e\u5230 <code>max_connections<\/code> \u53c3\u6578\uff0c\u4e26\u5c07\u5176\u503c\u589e\u52a0\u3002\u4f8b\u5982\uff1a\n   max_connections = 200\n3. \u4fdd\u5b58\u6587\u4ef6\u4e26\u91cd\u555f PostgreSQL \u670d\u52d9\uff1a\n   sudo systemctl restart postgresql\n<\/code><\/pre>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8%e9%80%a3%e6%8e%a5%e6%b1%a0-ijVOxIpVpW\">2. \u4f7f\u7528\u9023\u63a5\u6c60<\/h3>\n<p>\u4f7f\u7528\u9023\u63a5\u6c60\u53ef\u4ee5\u6709\u6548\u5730\u7ba1\u7406\u6578\u64da\u5eab\u9023\u63a5\uff0c\u6e1b\u5c11\u6bcf\u500b\u61c9\u7528\u7a0b\u5e8f\u6240\u9700\u7684\u9023\u63a5\u6578\u3002\u5e38\u898b\u7684\u9023\u63a5\u6c60\u5de5\u5177\u5305\u62ec PgBouncer \u548c HikariCP\u3002\u9019\u4e9b\u5de5\u5177\u53ef\u4ee5\u5e6b\u52a9\u60a8\u91cd\u7528\u73fe\u6709\u7684\u9023\u63a5\uff0c\u800c\u4e0d\u662f\u6bcf\u6b21\u90fd\u5275\u5efa\u65b0\u7684\u9023\u63a5\u3002<\/p>\n<h3 id=\"3-%e5%84%aa%e5%8c%96%e6%87%89%e7%94%a8%e7%a8%8b%e5%ba%8f%e4%bb%a3%e7%a2%bc-ijVOxIpVpW\">3. \u512a\u5316\u61c9\u7528\u7a0b\u5e8f\u4ee3\u78bc<\/h3>\n<p>\u6aa2\u67e5\u61c9\u7528\u7a0b\u5e8f\u7684\u4ee3\u78bc\uff0c\u78ba\u4fdd\u5728\u4e0d\u9700\u8981\u6642\u53ca\u6642\u95dc\u9589\u6578\u64da\u5eab\u9023\u63a5\u3002\u4f7f\u7528 <code>try-with-resources<\/code> \u8a9e\u53e5\uff08\u5728 Java \u4e2d\uff09\u6216\u78ba\u4fdd\u5728 Python \u4e2d\u4f7f\u7528 <code>with<\/code> \u8a9e\u53e5\u4f86\u81ea\u52d5\u7ba1\u7406\u9023\u63a5\u7684\u958b\u95dc\u3002<\/p>\n<pre><code># Python \u793a\u4f8b\nimport psycopg2\n\nwith psycopg2.connect(\"dbname=test user=postgres password=secret\") as conn:\n    with conn.cursor() as cursor:\n        cursor.execute(\"SELECT * FROM my_table;\")\n<\/code><\/pre>\n<h3 id=\"4-%e7%9b%a3%e6%8e%a7%e5%92%8c%e8%aa%bf%e6%95%b4-ijVOxIpVpW\">4. \u76e3\u63a7\u548c\u8abf\u6574<\/h3>\n<p>\u5b9a\u671f\u76e3\u63a7\u6578\u64da\u5eab\u7684\u9023\u63a5\u6578\u548c\u6027\u80fd\u6307\u6a19\uff0c\u6839\u64da\u5be6\u969b\u9700\u6c42\u8abf\u6574 <code>max_connections<\/code> \u548c\u5176\u4ed6\u76f8\u95dc\u53c3\u6578\u3002\u53ef\u4ee5\u4f7f\u7528 PostgreSQL \u7684\u5167\u5efa\u8996\u5716 <code>pg_stat_activity<\/code> \u4f86\u67e5\u770b\u7576\u524d\u7684\u9023\u63a5\u72c0\u614b\u3002<\/p>\n<pre><code>SELECT * FROM pg_stat_activity;\n<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-ijVOxIpVpW\">\u7e3d\u7d50<\/h2>\n<p>PostgreSQL \u932f\u8aa4\u4ee3\u78bc 53300 &#8211; too_many_connections \u662f\u4e00\u500b\u5e38\u898b\u7684\u554f\u984c\uff0c\u901a\u5e38\u53ef\u4ee5\u901a\u904e\u589e\u52a0 <code>max_connections<\/code> \u8a2d\u5b9a\u3001\u4f7f\u7528\u9023\u63a5\u6c60\u3001\u512a\u5316\u61c9\u7528\u7a0b\u5e8f\u4ee3\u78bc\u4ee5\u53ca\u5b9a\u671f\u76e3\u63a7\u4f86\u89e3\u6c7a\u3002\u9019\u4e9b\u65b9\u6cd5\u4e0d\u50c5\u80fd\u5e6b\u52a9\u60a8\u4fee\u5fa9\u7576\u524d\u7684\u554f\u984c\uff0c\u9084\u80fd\u63d0\u9ad8\u6578\u64da\u5eab\u7684\u6574\u9ad4\u6027\u80fd\u548c\u7a69\u5b9a\u6027\u3002\u5982\u679c\u60a8\u9700\u8981\u9032\u4e00\u6b65\u7684\u652f\u6301\u6216\u5c0b\u627e\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0c\u8acb\u8003\u616e\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u4fe1\u606f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u4fee\u5fa9 PostgreSQL \u932f\u8aa4\u4ee3\u78bc 53300 &#8211; too_many_connections\uff0c\u63d0\u5347\u6578\u64da\u5eab\u6027\u80fd\uff0c\u907f\u514d\u9023\u63a5\u904e\u591a\u554f\u984c\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-179072","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179072","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"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=179072"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179072\/revisions"}],"predecessor-version":[{"id":179073,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/179072\/revisions\/179073"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=179072"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=179072"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=179072"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}