{"id":107161,"date":"2026-09-19T04:20:16","date_gmt":"2026-09-18T20:20:16","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/107161.html"},"modified":"2026-09-19T04:20:16","modified_gmt":"2026-09-18T20:20:16","slug":"%e7%aa%81%e7%a0%b432%e4%bd%8d%e4%ba%8b%e5%8a%a1%e5%8f%b7%e6%a1%8e%e6%a2%8f%ef%bc%81%e9%87%91%e4%bb%93v9-64%e4%bd%8dxid%e6%8a%80%e6%9c%af%e5%ae%9e%e6%b5%8b%e6%8b%86%e8%a7%a3%e4%b8%8e%e5%ba%95%e5%b1%82","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/107161.html","title":{"rendered":"\u7a81\u783432\u4f4d\u4e8b\u52a1\u53f7\u684e\u688f\uff01\u91d1\u4ed3V9 64\u4f4dXID\u6280\u672f\u5b9e\u6d4b\u62c6\u89e3\u4e0e\u5e95\u5c42\u5185\u6838\u5b9e\u73b0\u89e3\u6790"},"content":{"rendered":"<p>\u4e94\u5e74\u524d&#xff0c;PostgreSQL 32\u4f4d\u4e8b\u52a1\u53f7\u5e26\u6765\u7684\u8fd0\u7ef4\u75db\u70b9&#xff0c;\u4e00\u76f4\u662f\u9ad8\u5199\u5165\u4e1a\u52a1\u573a\u666f\u4e2d\u96be\u4ee5\u7ed5\u5f00\u7684\u96be\u9898\u3002\u800c\u5728\u4eca\u5929&#xff0c;\u8fd9\u4e00\u957f\u671f\u56f0\u6270\u6570\u636e\u5e93\u4ece\u4e1a\u8005\u7684\u5386\u53f2\u987d\u75be&#xff0c;\u5728\u56fd\u4ea7\u91d1\u4ed3\u6570\u636e\u5e93\u4e2d\u8fce\u6765\u4e86\u7a81\u7834\u6027\u89e3\u51b3\u65b9\u6848\u3002\u672c\u6587\u4e00\u65b9\u9762\u9762\u5411\u6570\u636e\u5e93\u5165\u95e8\u8bfb\u8005&#xff0c;\u901a\u4fd7\u62c6\u89e3PostgreSQL\u4e8b\u52a1\u53f7XID\u5e95\u5c42\u539f\u7406&#xff1b;\u53e6\u4e00\u65b9\u9762&#xff0c;\u9762\u5411PG\u5185\u6838\u7814\u53d1\u4eba\u5458&#xff0c;\u5b8c\u6574\u5256\u6790\u91d1\u4ed3\u672c\u6b2164\u4f4d\u4e8b\u52a1\u53f7\u7279\u6027\u7684\u6539\u9020\u5185\u5bb9\u3001\u5b9e\u73b0\u601d\u8def&#xff0c;\u540c\u65f6\u5ba2\u89c2\u68b3\u7406\u5f53\u524d\u65b9\u6848\u7684\u80fd\u529b\u8fb9\u754c&#xff0c;\u4f5c\u4e3a\u53ef\u843d\u5730\u7684\u6280\u672f\u53c2\u8003\u6587\u6863\u3002<\/p>\n<hr 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style=\"margin-left:40px\">\u4e09\u3001\u91d1\u4ed3V009R002C016\u7248\u672c&#xff0c;64\u4f4dXID\u6539\u9020\u7684\u5b9e\u9645\u8986\u76d6\u8303\u56f4<\/p>\n<p id=\"3.1%20%E5%AE%98%E6%96%B9%E6%96%87%E6%A1%A3%E6%98%8E%E7%A1%AE%E7%9A%84%E8%83%BD%E5%8A%9B%E6%8F%8F%E8%BF%B0-toc\" style=\"margin-left:80px\">3.1 \u5b98\u65b9\u6587\u6863\u660e\u786e\u7684\u80fd\u529b\u63cf\u8ff0<\/p>\n<p id=\"3.2%20%E6%A0%B8%E5%BF%83%E6%94%B9%E5%8A%A8%EF%BC%9AVACUUM%E7%9B%B8%E5%85%B3%E5%8F%82%E6%95%B0%E5%8D%87%E7%BA%A7%E4%B8%BAint64%E7%B1%BB%E5%9E%8B-toc\" style=\"margin-left:80px\">3.2 \u6838\u5fc3\u6539\u52a8&#xff1a;VACUUM\u76f8\u5173\u53c2\u6570\u5347\u7ea7\u4e3aint64\u7c7b\u578b<\/p>\n<p id=\"3.3%20%E9%85%8D%E5%A5%97%E6%94%B9%E9%80%A0%EF%BC%9A%E5%AE%9E%E4%BE%8B%E7%BA%A7%E5%8A%A8%E6%80%81%E5%86%85%E5%AD%98%E7%AE%A1%E6%8E%A7-toc\" style=\"margin-left:80px\">3.3 \u914d\u5957\u6539\u9020&#xff1a;\u5b9e\u4f8b\u7ea7\u52a8\u6001\u5185\u5b58\u7ba1\u63a7<\/p>\n<p id=\"3.4%20%E5%8D%8F%E5%90%8C%E4%BC%98%E5%8C%96%EF%BC%9AFastPath%E9%94%81%E6%9C%BA%E5%88%B6%E5%8D%87%E7%BA%A7-toc\" style=\"margin-left:80px\">3.4 \u534f\u540c\u4f18\u5316&#xff1a;FastPath\u9501\u673a\u5236\u5347\u7ea7<\/p>\n<p id=\"%E5%9B%9B%E3%80%81%E9%9D%A2%E5%90%91%E5%85%A5%E9%97%A8%E8%AF%BB%E8%80%85%EF%BC%9A5%E4%B8%AA%E6%A0%B8%E5%BF%83%E7%9F%A5%E8%AF%86%E7%82%B9%EF%BC%8C%E5%BF%AB%E9%80%9F%E7%90%86%E8%A7%A364%E4%BD%8DXID-toc\" style=\"margin-left:40px\">\u56db\u3001\u9762\u5411\u5165\u95e8\u8bfb\u8005&#xff1a;5\u4e2a\u6838\u5fc3\u77e5\u8bc6\u70b9&#xff0c;\u5feb\u901f\u7406\u89e364\u4f4dXID<\/p>\n<p id=\"4.1%2032%E4%BD%8DXID%E7%9A%84%E5%9C%86%E7%8E%AF%E5%BE%AA%E7%8E%AF%E6%A8%A1%E5%9E%8B-toc\" style=\"margin-left:80px\">4.1 32\u4f4dXID\u7684\u5706\u73af\u5faa\u73af\u6a21\u578b<\/p>\n<p id=\"4.2%20freeze%E5%86%BB%E7%BB%93%E5%88%B0%E5%BA%95%E5%9C%A8%E5%81%9A%E4%BB%80%E4%B9%88-toc\" style=\"margin-left:80px\">4.2 freeze\u51bb\u7ed3\u5230\u5e95\u5728\u505a\u4ec0\u4e48<\/p>\n<p id=\"4.3%2064%E4%BD%8DXID%E5%B8%A6%E6%9D%A5%E7%9A%84%E7%9C%9F%E5%AE%9E%E4%B8%9A%E5%8A%A1%E6%94%B6%E7%9B%8A-toc\" style=\"margin-left:80px\">4.3 64\u4f4dXID\u5e26\u6765\u7684\u771f\u5b9e\u4e1a\u52a1\u6536\u76ca<\/p>\n<p id=\"4.4%20autovacuum%E8%B0%83%E4%BC%98%E9%80%BB%E8%BE%91%E5%8F%91%E7%94%9F%E6%9C%AC%E8%B4%A8%E5%8F%98%E5%8C%96-toc\" style=\"margin-left:80px\">4.4 autovacuum\u8c03\u4f18\u903b\u8f91\u53d1\u751f\u672c\u8d28\u53d8\u5316<\/p>\n<p id=\"4.5%20%E5%92%8C%E4%B8%BB%E4%BB%8E%E5%A4%8D%E5%88%B6%E3%80%81%E5%A4%87%E4%BB%BD%E6%81%A2%E5%A4%8D%E7%9A%84%E5%85%B3%E8%81%94-toc\" style=\"margin-left:80px\">4.5 \u548c\u4e3b\u4ece\u590d\u5236\u3001\u5907\u4efd\u6062\u590d\u7684\u5173\u8054<\/p>\n<p id=\"%E4%BA%94%E3%80%81%E9%9D%A2%E5%90%91%E5%86%85%E6%A0%B8%E4%B8%93%E5%AE%B6%EF%BC%9A%E5%BA%95%E5%B1%82%E5%AE%9E%E7%8E%B0%E7%BB%86%E8%8A%82%E6%B7%B1%E5%BA%A6%E8%A7%A3%E8%AF%BB-toc\" style=\"margin-left:40px\">\u4e94\u3001\u9762\u5411\u5185\u6838\u4e13\u5bb6&#xff1a;\u5e95\u5c42\u5b9e\u73b0\u7ec6\u8282\u6df1\u5ea6\u89e3\u8bfb<\/p>\n<p id=\"5.1%20%E6%95%B0%E6%8D%AE%E7%B1%BB%E5%9E%8B%E5%B1%82%E9%9D%A2%E7%9A%84%E5%B7%A5%E7%A8%8B%E5%8F%96%E8%88%8D-toc\" style=\"margin-left:80px\">5.1 \u6570\u636e\u7c7b\u578b\u5c42\u9762\u7684\u5de5\u7a0b\u53d6\u820d<\/p>\n<p id=\"5.2%2032%E4%BD%8D%E5%8D%87%E7%BA%A764%E4%BD%8D%EF%BC%8Cautovacuum%E5%88%86%E9%98%B6%E6%AE%B5%E8%B0%83%E4%BC%98%E5%BB%BA%E8%AE%AE-toc\" style=\"margin-left:80px\">5.2 32\u4f4d\u5347\u7ea764\u4f4d&#xff0c;autovacuum\u5206\u9636\u6bb5\u8c03\u4f18\u5efa\u8bae<\/p>\n<p id=\"5.3%20%E5%92%8CPG%2016%2F17%2F18%E7%89%88%E6%9C%AC%E6%A8%AA%E5%90%91%E5%AF%B9%E6%AF%94-toc\" style=\"margin-left:80px\">5.3 \u548cPG 16\/17\/18\u7248\u672c\u6a2a\u5411\u5bf9\u6bd4<\/p>\n<p id=\"5.4%20%E5%A4%9A%E6%95%B0%E6%8D%AE%E5%BA%93%E6%A8%AA%E5%90%91%E5%AF%B9%E6%AF%94-toc\" style=\"margin-left:80px\">5.4 \u591a\u6570\u636e\u5e93\u6a2a\u5411\u5bf9\u6bd4<\/p>\n<p id=\"%E5%85%AD%E3%80%81%E9%87%91%E4%BB%93%E6%9C%AC%E6%AC%A1%E6%94%B9%E9%80%A0%EF%BC%8C%E5%B8%A6%E7%BB%99PG%E7%A4%BE%E5%8C%BA%E7%9A%84%E5%90%AF%E5%8F%91-toc\" style=\"margin-left:40px\">\u516d\u3001\u91d1\u4ed3\u672c\u6b21\u6539\u9020&#xff0c;\u5e26\u7ed9PG\u793e\u533a\u7684\u542f\u53d1<\/p>\n<p id=\"6.1%20%E6%B8%90%E8%BF%9B%E5%BC%8FXID%E6%89%A9%E5%B1%95%E6%96%B9%E6%A1%88-toc\" style=\"margin-left:80px\">6.1 \u6e10\u8fdb\u5f0fXID\u6269\u5c55\u65b9\u6848<\/p>\n<p id=\"6.2%20%E9%BB%98%E8%AE%A4%E5%8F%82%E6%95%B0%E4%B8%8D%E5%8F%98%E7%9A%84%E5%85%BC%E5%AE%B9%E6%80%A7%E8%AE%BE%E8%AE%A1-toc\" style=\"margin-left:80px\">6.2 \u9ed8\u8ba4\u53c2\u6570\u4e0d\u53d8\u7684\u517c\u5bb9\u6027\u8bbe\u8ba1<\/p>\n<p id=\"6.3%20%E9%87%8D%E6%96%B0%E7%90%86%E8%A7%A3freeze%E7%9A%84%E5%AE%9A%E4%BD%8D-toc\" style=\"margin-left:80px\">6.3 \u91cd\u65b0\u7406\u89e3freeze\u7684\u5b9a\u4f4d<\/p>\n<p id=\"%E4%B8%83%E3%80%81%E9%9D%A2%E5%90%91%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91%E8%80%85%E7%9A%84%E5%AE%9E%E8%B7%B5%E5%BB%BA%E8%AE%AE-toc\" style=\"margin-left:40px\">\u4e03\u3001\u9762\u5411\u5e94\u7528\u5f00\u53d1\u8005\u7684\u5b9e\u8df5\u5efa\u8bae<\/p>\n<p id=\"%E5%85%AB%E3%80%81%E5%AF%B9%E9%87%91%E4%BB%93%E5%90%8E%E7%BB%AD%E8%BF%AD%E4%BB%A3%E7%9A%84%E4%B8%A4%E7%82%B9%E6%9C%9F%E5%BE%85-toc\" style=\"margin-left:40px\">\u516b\u3001\u5bf9\u91d1\u4ed3\u540e\u7eed\u8fed\u4ee3\u7684\u4e24\u70b9\u671f\u5f85<\/p>\n<p id=\"%E4%B9%9D%E3%80%81%E5%86%99%E5%9C%A8%E6%9C%80%E5%90%8E-toc\" style=\"margin-left:40px\">\u4e5d\u3001\u5199\u5728\u6700\u540e<\/p>\n<p>\u00a0 <\/p>\n<hr \/>\n<h3 id=\"%E4%B8%80%E3%80%81%E4%B8%BA%E4%BB%80%E4%B9%88PG%E7%9A%8432%E4%BD%8DXID%EF%BC%8C%E9%95%BF%E6%9C%9F%E8%A2%AB%E8%A7%86%E4%B8%BA%E6%95%B0%E6%8D%AE%E5%BA%93%E8%BF%90%E7%BB%B4%E7%9A%84%E9%A1%BD%E5%9B%BA%E9%9A%BE%E9%A2%98\">\u4e00\u3001\u4e3a\u4ec0\u4e48PG\u768432\u4f4dXID&#xff0c;\u957f\u671f\u88ab\u89c6\u4e3a\u6570\u636e\u5e93\u8fd0\u7ef4\u7684\u987d\u56fa\u96be\u9898<\/h3>\n<p>PostgreSQL\u5185\u90e8\u91c7\u752832\u4f4d\u65e0\u7b26\u53f7\u6574\u6570\u5b58\u50a8\u4e8b\u52a1\u7f16\u53f7&#xff0c;TransactionId\u672c\u8d28\u4e0a\u662fuint32\u6570\u636e\u7c7b\u578b\u3002\u4ece\u6570\u503c\u4e0a\u9650\u6765\u770b&#xff0c;\u6574\u4e2a\u6570\u636e\u5e93\u96c6\u7fa4\u6700\u591a\u80fd\u591f\u5206\u914d\u7ea643\u4ebf&#xff08;2\u00b3\u00b2&#xff09;\u4e2a\u4e8b\u52a1\u53f7\u3002\u5355\u770b\u8fd9\u4e2a\u6570\u5b57&#xff0c;\u4f53\u91cf\u4f3c\u4e4e\u5341\u5206\u5e9e\u5927&#xff0c;\u4f46\u5728\u9ad8\u541e\u5410\u5199\u5165\u7684\u4e1a\u52a1\u573a\u666f\u4e0b&#xff0c;\u4e8b\u52a1\u53f7\u6d88\u8017\u901f\u5ea6\u4f1a\u8fdc\u8d85\u9884\u671f\u3002\u5178\u578b\u7535\u5546\u4e1a\u52a1\u6570\u636e\u5e93&#xff0c;\u5355\u65e5\u4e8b\u52a1\u4ea7\u751f\u91cf\u5c31\u53ef\u4ee5\u8fbe\u52305\u4ebf\u81f310\u4ebf\u7ea7\u522b&#xff0c;\u4e8b\u52a1\u53f7\u4f1a\u5feb\u901f\u8017\u5c3d\u3002<\/p>\n<p>\u4e00\u65e6\u4e8b\u52a1\u53f7\u8017\u5c3d&#xff0c;\u5c31\u4f1a\u89e6\u53d1\u5e95\u5c42MVCC\u53ef\u89c1\u6027\u5224\u65ad\u673a\u5236\u7684\u6838\u5fc3\u77db\u76fe\u3002PG\u7684\u591a\u7248\u672c\u53ef\u89c1\u6027\u5224\u65ad\u89c4\u5219\u4f9d\u9760t_xmin &lt; current_xid\u903b\u8f91\u5b8c\u6210\u3002\u5f53\u5168\u90e832\u4f4d\u7a7a\u95f4\u5185\u4e8b\u52a1\u53f7\u5206\u914d\u5b8c\u6bd5&#xff0c;\u65b0\u4e8b\u52a1\u65e0\u6cd5\u83b7\u53d6\u5168\u65b0\u7f16\u53f7&#xff0c;\u4e8b\u52a1\u53f7\u5c31\u5fc5\u987b\u5f00\u542f\u5faa\u73af\u590d\u7528\u3002\u968f\u4e4b\u800c\u6765\u7684\u6838\u5fc3\u96be\u9898&#xff1a;\u5982\u4f55\u5728\u6709\u9650\u768432\u4f4d\u6570\u503c\u7a7a\u95f4\u5185&#xff0c;\u533a\u5206\u65e7\u4e8b\u52a1\u53f7\u4e0e\u65b0\u590d\u7528\u7684\u4e8b\u52a1\u53f7&#xff0c;\u907f\u514d\u7248\u672c\u51b2\u7a81\u3001\u53ef\u89c1\u6027\u903b\u8f91\u9519\u4e71&#xff1f;<\/p>\n<p>PostgreSQL\u793e\u533a\u7ed9\u51fa\u7684\u7ecf\u5178\u65b9\u6848\u5c31\u662f\u51bb\u7ed3\u4e8b\u52a1\u53f7&#xff08;frozen xid&#xff09;\u3002\u7b80\u5355\u7406\u89e3&#xff0c;PG\u628a\u6574\u4e2aXID\u7a7a\u95f4\u60f3\u8c61\u6210\u4e00\u4e2a\u5706\u73af&#xff0c;frozen xid\u662f\u5706\u73af\u4e0a\u7684\u5206\u754c\u70b9\u3002\u987a\u65f6\u9488\u65b9\u5411\u4ee3\u8868\u5df2\u7ecf\u5206\u914d\u5b8c\u6210\u3001\u5c5e\u4e8e\u8fc7\u53bb\u7684\u4e8b\u52a1\u7f16\u53f7&#xff1b;\u9006\u65f6\u9488\u65b9\u5411\u4ee3\u8868\u8fd8\u672a\u5206\u914d\u3001\u53ef\u4f9b\u65b0\u4e8b\u52a1\u4f7f\u7528\u7684\u4e8b\u52a1\u53f7\u3002\u6bcf\u5f53\u6d88\u8017\u7ea620\u4ebf\u4e8b\u52a1\u53f7&#xff0c;frozen xid\u5206\u754c\u70b9\u5c31\u5fc5\u987b\u5411\u524d\u79fb\u52a8\u3002\u79fb\u52a8\u5206\u754c\u70b9\u7684\u6267\u884c\u903b\u8f91&#xff0c;\u4f9d\u9760autovacuum\u81ea\u52a8\u6e05\u7406\u8fdb\u7a0b\u626b\u63cf\u5168\u8868&#xff0c;\u5c06\u6240\u6709t_xmin &lt; frozen_xid\u7684\u6570\u636e\u884c\u5934\u4fe1\u606f\u5185\u7684xmin\u6253\u4e0afrozen\u51bb\u7ed3\u6807\u8bb0\u3002\u88ab\u6807\u8bb0\u51bb\u7ed3\u7684\u6570\u636e\u884c&#xff0c;\u4f1a\u88ab\u8ba4\u5b9a\u4e3a\u6c38\u4e45\u53ef\u89c1&#xff0c;\u4e0d\u518d\u53c2\u4e0e\u540e\u7eed\u7684\u4e8b\u52a1\u53ef\u89c1\u6027\u5bf9\u6bd4\u5224\u65ad\u3002<\/p>\n<p>\u8fd9\u5957\u539f\u751f\u673a\u5236&#xff0c;\u5728\u751f\u4ea7\u73af\u5883\u5e26\u6765\u4e86\u6c89\u91cd\u4e14\u65e0\u6cd5\u5ffd\u89c6\u7684\u8fd0\u7ef4\u4ee3\u4ef7\u3002 \u7b2c\u4e00&#xff0c;\u51bb\u7ed3\u98ce\u66b4\u98ce\u9669\u3002\u6267\u884c\u5168\u8868\u626b\u63cf\u51bb\u7ed3\u64cd\u4f5c\u65f6&#xff0c;\u4f1a\u77ac\u95f4\u62c9\u9ad8\u78c1\u76d8IO\u538b\u529b&#xff0c;WAL\u65e5\u5fd7\u91cf\u66b4\u6da8&#xff0c;\u76f4\u63a5\u5f15\u53d1\u4e3b\u4ece\u590d\u5236\u5ef6\u8fdf&#xff0c;\u4e25\u91cd\u5f71\u54cd\u4e1a\u52a1\u8bfb\u5199\u6027\u80fd\u3002 \u7b2c\u4e8c&#xff0c;\u957f\u4e8b\u52a1\u4f1a\u9020\u6210\u5f3a\u5236\u505c\u5e93\u51bb\u7ed3\u98ce\u9669\u3002autovacuum\u4f1a\u8df3\u8fc7\u6b63\u5728\u88ab\u957f\u4e8b\u52a1\u5360\u7528\u7684\u6570\u636e\u9875&#xff0c;\u53ea\u8981\u957f\u4e8b\u52a1\u6301\u7eed\u8fd0\u884c\u4e00\u5929&#xff0c;\u51bb\u7ed3\u64cd\u4f5c\u5c31\u4f1a\u6301\u7eed\u5ef6\u540e\u3002\u6781\u7aef\u573a\u666f\u4e0b&#xff0c;pg_xact\u7cfb\u7edf\u8868\u5269\u4f59\u53ef\u7528slot\u4e0d\u8db3100\u4e07\u65f6&#xff0c;PG\u6570\u636e\u5e93\u4f1a\u5f3a\u5236\u5207\u6362\u81f3\u5355\u7528\u6237\u6a21\u5f0f&#xff0c;\u62d2\u7edd\u63a5\u6536\u6240\u6709\u65b0\u4e8b\u52a1&#xff0c;\u53ea\u4e3a\u5b8c\u6210\u5168\u5e93\u51bb\u7ed3&#xff0c;\u76f4\u63a5\u9020\u6210\u4e1a\u52a1\u4e2d\u65ad\u3002 \u7b2c\u4e09&#xff0c;\u6781\u9ad8\u7684\u8fd0\u7ef4\u5fc3\u667a\u8d1f\u62c5\u3002\u6570\u636e\u5e93\u4e0a\u7ebf\u90e8\u7f72\u9636\u6bb5&#xff0c;DBA\u5fc5\u987b\u63d0\u524d\u6d4b\u7b97\u4e1a\u52a1\u6bcf\u65e5\u4e8b\u52a1\u4ea7\u751f\u91cf\u3001\u5408\u7406\u914d\u7f6e\u51bb\u7ed3\u9608\u503c&#xff0c;\u8bc4\u4f30SSD\u78c1\u76d8\u80fd\u5426\u627f\u53d7\u51bb\u7ed3\u5e26\u6765\u7684\u77ac\u65f6IO\u51b2\u51fb\u3002\u4efb\u4f55\u53c2\u6570\u4f30\u7b97\u5931\u8bef&#xff0c;\u90fd\u6709\u53ef\u80fd\u76f4\u63a5\u5f15\u53d1\u751f\u4ea7\u4e8b\u6545\u3002<\/p>\n<p>\u65e9\u57282021\u5e748\u670824\u65e5&#xff0c;\u6211\u5728\u535a\u5ba2\u300aDB\u5410\u69fd\u5927\u4f1a\u7b2c2\u671f &#8211; PG 32\u4f4d xid\u300b\u4e2d\u5c31\u4e13\u95e8\u9610\u8ff0\u8fc7\u8be5\u95ee\u9898&#xff1a;\u4e8b\u52a1\u53f7XID\u4e3auint32\u7c7b\u578b&#xff0c;\u4e0a\u9650\u4ec540\u4ebf&#xff0c;\u4e8b\u52a1\u53f7\u5fc5\u987b\u5faa\u73af\u590d\u7528\u3002\u540c\u65f6\u5728\u6587\u4e2d\u63d0\u51fa\u4f18\u5316\u65b9\u5411&#xff0c;\u5efa\u8bae\u672a\u6765\u6570\u636e\u5e93\u7248\u672c\u8fed\u4ee3\u65f6&#xff0c;\u5f15\u516564\u4f4dXID\u65b9\u6848&#xff0c;\u7c7b\u4f3czedstore\u3001zheap\u3001postgrespro\u7b49\u5b58\u50a8\u5f15\u64ce\u7684\u8bbe\u8ba1\u601d\u8def\u3002<\/p>\n<p>\u4e94\u5e74\u65f6\u95f4\u5306\u5306\u800c\u8fc7&#xff0c;PostgreSQL\u793e\u533a\u81f3\u4eca\u6ca1\u6709\u6b63\u5f0f\u5408\u5165\u5b8c\u657464\u4f4dXID\u5185\u6838\u65b9\u6848\u3002\u53c2\u80032026\u5e74PG\u90ae\u4ef6\u5217\u8868\u7684\u793e\u533a\u5171\u8bc6&#xff1a;\u867d\u7136PG\u5df2\u7ecf\u5b58\u5728xid8\u6570\u636e\u7c7b\u578b&#xff0c;\u4f46\u6570\u636e\u5e93\u5185\u6838\u5185\u90e8\u4f7f\u7528\u7684TransactionId\u4e8b\u52a1\u53f7\u4f9d\u65e7\u662fuint32\u3002\u793e\u533a\u9009\u62e9\u4fdd\u7559\u539f\u6709\u65b9\u6848\u7684\u7406\u7531\u5341\u5206\u73b0\u5b9e&#xff1a;32\u4f4dXID\u642d\u914dfrozen\u51bb\u7ed3\u673a\u5236\u5c1a\u4e14\u53ef\u4ee5\u6b63\u5e38\u8fd0\u884c&#xff1b;\u5982\u679c\u5168\u9762\u5347\u7ea7\u4e3a64\u4f4d\u4e8b\u52a1\u53f7&#xff0c;\u9700\u8981\u4fee\u6539tuple\u5934\u90e8\u3001CLOG\u63d0\u4ea4\u65e5\u5fd7\u3001vacuum\u6e05\u7406\u903b\u8f91\u3001\u6d41\u590d\u5236\u534f\u8bae\u3001\u5b50\u4e8b\u52a1\u3001\u4e24\u9636\u6bb5\u63d0\u4ea4\u4e8b\u52a1\u3001\u54c8\u5e0c\u8fde\u63a5\u7b49\u5927\u91cf\u4f9d\u8d56XID\u7684\u5e95\u5c42\u6a21\u5757&#xff0c;\u6539\u52a8\u8303\u56f4\u6781\u5927&#xff0c;\u98ce\u9669\u96be\u4ee5\u8bc4\u4f30\u3002<\/p>\n<p>\u800c2026\u5e748\u670828\u65e5\u53d1\u5e03\u7684\u91d1\u4ed3V009R002C016\u7248\u672c&#xff0c;\u5728\u7248\u672c\u6587\u6863\u4e2d\u660e\u786e\u6807\u6ce8&#xff1a;\u652f\u630164\u4f4d\u4e8b\u52a1ID&#xff08;XID&#xff09;&#xff0c;\u80fd\u591f\u89c4\u907f32\u4f4d\u4e8b\u52a1ID\u56de\u6536\u4e0d\u53ca\u65f6&#xff0c;\u6216\u662f\u957f\u4e8b\u52a1\u963b\u585e\u51bb\u7ed3\u6d41\u7a0b\u800c\u5f15\u53d1\u7684\u4e1a\u52a1\u4e2d\u65ad\u6545\u969c\u3002<\/p>\n<p>\u8fd9\u4e5f\u662f\u56fd\u4ea7\u6570\u636e\u5e93\u9886\u57df&#xff0c;\u7b2c\u4e00\u6b21\u5c0664\u4f4d\u4e8b\u52a1\u53f7\u80fd\u529b\u6253\u78e8\u81f3\u751f\u4ea7\u53ef\u7528\u7ea7\u522b&#xff0c;\u5176\u6280\u672f\u4ef7\u503c&#xff0c;\u4e0d\u4e9a\u4e8ePostgreSQL15\u7248\u672c\u5b9e\u73b0\u7684\u903b\u8f91\u590d\u5236\u8de8\u5927\u7248\u672c\u517c\u5bb9\u80fd\u529b\u3002<\/p>\n<h3 id=\"%E4%BA%8C%E3%80%8164%E4%BD%8DXID%E5%86%85%E6%A0%B8%E6%94%B9%E9%80%A0%EF%BC%8C%E8%83%8C%E5%90%8E%E7%9C%9F%E5%AE%9E%E5%AD%98%E5%9C%A8%E7%9A%84%E6%8A%80%E6%9C%AF%E5%A3%81%E5%9E%92\">\u4e8c\u300164\u4f4dXID\u5185\u6838\u6539\u9020&#xff0c;\u80cc\u540e\u771f\u5b9e\u5b58\u5728\u7684\u6280\u672f\u58c1\u5792<\/h3>\n<p>\u60f3\u8981\u8bfb\u61c2\u91d1\u4ed3\u672c\u6b21\u7684\u6280\u672f\u5b9e\u73b0&#xff0c;\u9996\u5148\u8981\u7406\u89e3\u4e3a\u4ec0\u4e48PG\u793e\u533a\u591a\u5e74\u8fdf\u8fdf\u4e0d\u6562\u843d\u5730\u5168\u91cf64\u4f4dXID\u6539\u9020\u3002\u5c06\u4e8b\u52a1\u53f7\u4ece32\u4f4d\u5347\u7ea7\u81f364\u4f4d&#xff0c;\u7edd\u975e\u7b80\u5355\u4fee\u6539\u4e00\u4e2a\u53d8\u91cf\u7c7b\u578b&#xff0c;\u5185\u6838\u591a\u4e2a\u6838\u5fc3\u6a21\u5757\u90fd\u4f1a\u53d7\u5230\u7275\u8fde&#xff0c;\u6539\u9020\u96be\u70b9\u5206\u5e03\u5728\u591a\u4e2a\u5e95\u5c42\u7ec4\u4ef6&#xff1a;<\/p>\n<p>1.Tuple\u5934\u90e8\u5b58\u50a8\u7a7a\u95f4\u81a8\u80c0\u95ee\u9898 PG\u539f\u751fHeapTupleHeaderData\u7ed3\u6784\u7b80\u5316\u5b9a\u4e49\u5982\u4e0b&#xff1a;<\/p>\n<p>typedef struct HeapTupleHeaderData {<br \/>\n    t_choice    t_choice;         \/\/ t_xmin\u5b58\u50a8\u6a21\u5f0f<br \/>\n    TransactionId t_xmin;         \/\/ 32\u4f4d\u4e8b\u52a1\u53f7<br \/>\n    TransactionId t_xmax;         \/\/ 32\u4f4d\u4e8b\u52a1\u53f7<br \/>\n    CommandId   t_cid;<br \/>\n    TransactionId t_xvac;         \/\/ 32\u4f4d&#xff0c;PG17\u7248\u672c\u5df2\u79fb\u9664<br \/>\n    TransactionId t_multi;        \/\/ multixact\u591a\u4e8b\u52a1ID&#xff0c;32\u4f4d<br \/>\n    ItemPointerData t_ctid;<br \/>\n}; <\/p>\n<p>\u5982\u679c\u76f4\u63a5\u5c06xmin\u3001xmax\u3001multi\u5168\u90e8\u5347\u7ea7\u4e3a64\u4f4d&#xff0c;\u6bcf\u4e00\u6761tuple\u5143\u7ec4\u5934\u90e8\u5c31\u8981\u989d\u5916\u589e\u52a016\u5b57\u8282\u3002\u5bf9\u4e8e\u4e00\u5f20\u62e5\u670910\u4ebf\u884c\u6570\u636e\u7684\u5927\u8868&#xff0c;\u4ec5\u5143\u7ec4\u5934\u90e8\u5c31\u8981\u989d\u5916\u5360\u752816GB\u5b58\u50a8\u7a7a\u95f4&#xff0c;\u8fd9\u4e5f\u662fPG\u793e\u533a\u6700\u5927\u7684\u987e\u8651\u4e4b\u4e00\u3002<\/p>\n<p>2. CLOG\u63d0\u4ea4\u65e5\u5fd7\u65e0\u6cd5\u7ee7\u7eed\u6cbf\u7528SLRU\u5b58\u50a8\u67b6\u6784 PG\u7684CLOG&#xff08;Commit Log&#xff09;\u7528\u6765\u8bb0\u5f55\u6bcf\u4e00\u7b14\u4e8b\u52a1\u7684\u63d0\u4ea4\u72b6\u6001&#xff0c;\u91c7\u75288KB\u9875\u5b58\u50a8&#xff0c;\u6bcf\u9875\u53ef\u5b58\u653e512\u4e2a\u4e8b\u52a1\u72b6\u6001&#xff0c;\u4f9d\u9760SLRU\u4e24\u7ea7\u7f13\u5b58\u7ba1\u7406\u3002\u5207\u6362\u523064\u4f4dXID\u540e&#xff0c;\u539f\u6709CLOG\u5b58\u50a8\u7ed3\u6784\u4e0d\u518d\u9002\u7528\u3002\u884c\u4e1a\u5185\u6709\u4e24\u79cd\u6539\u9020\u601d\u8def&#xff1a;\u73af\u5f62\u7f13\u51b2\u533a&#xff0c;\u6216\u662f\u57fa\u4e8e\u5206\u6bb5mmap\u6587\u4ef6\u7684\u5b58\u50a8\u65b9\u6848\u3002PG\u793e\u533a\u591a\u6b21\u8ba8\u8bba\u8be5\u65b9\u5411&#xff0c;\u4f46\u59cb\u7ec8\u6ca1\u6709\u843d\u5730&#xff0c;\u539f\u56e0\u5728\u4e8e\u6539\u52a8\u4f1a\u6df1\u5ea6\u5f71\u54cdvacuum\u7684\u53ef\u89c1\u6027\u5224\u65ad\u903b\u8f91\u3002<\/p>\n<p>3. Vacuum\u7684\u534a\u5706\u5224\u65ad\u8bed\u4e49\u5931\u6548 32\u4f4dXID\u67b6\u6784\u4e0b&#xff0c;vacuum\u901a\u8fc7relfrozenxid &lt; oldestXid &#8211; 2000000000\u8fdb\u884c\u5224\u65ad&#xff0c;\u6838\u5fc3\u903b\u8f91\u5c31\u662f\u5224\u5b9a\u534a\u5706\u8303\u56f4\u5185\u7684\u65e7\u4e8b\u52a1\u9700\u8981\u6267\u884c\u51bb\u7ed3\u3002\u4e00\u65e6\u5347\u7ea7\u4e3a64\u4f4dXID&#xff0c;\u4e8b\u52a1\u53f7\u7a7a\u95f4\u51e0\u4e4e\u65e0\u9650&#xff0c;\u4e1a\u52a1\u51e0\u4e4e\u65e0\u6cd5\u8017\u5c3d2\u2076\u00b3\u4e2a\u4e8b\u52a1&#xff0c;\u539f\u6709\u7684\u534a\u5706\u5faa\u73af\u673a\u5236\u5f7b\u5e95\u5931\u53bb\u610f\u4e49\u3002\u8fd9\u5c31\u9700\u8981\u5bf9\u51bb\u7ed3\u903b\u8f91\u8fdb\u884c\u5b8c\u5168\u91cd\u6784&#xff0c;\u76ee\u6807\u4ece\u201c\u5bf9\u6297\u4e8b\u52a1\u53f7\u5faa\u73af\u8017\u5c3d\u201d\u8f6c\u53d8\u4e3a\u201c\u5e38\u89c4\u5386\u53f2\u6570\u636e\u6e05\u7406\u201d\u3002<\/p>\n<p>4. \u5b50\u4e8b\u52a1\u4e0e\u4e24\u9636\u6bb5\u63d0\u4ea4\u4e8b\u52a1\u7684\u8fde\u9501\u5f71\u54cd PG\u5b50\u4e8b\u52a1\u53f7\u540c\u6837\u57fa\u4e8euint32\u5b9e\u73b0&#xff0c;\u590d\u7528\u7236\u4e8b\u52a1XID\u547d\u540d\u7a7a\u95f4\u3002\u5347\u7ea764\u4f4d\u4e4b\u540e&#xff0c;\u5b50\u4e8b\u52a1\u9700\u8981\u72ec\u7acb\u547d\u540d\u7a7a\u95f4&#xff0c;\u5e38\u89c1\u65b9\u6848\u662f\u9ad832\u4f4d\u5b58\u653e\u8fdb\u7a0b\u7f16\u53f7&#xff0c;\u4f4e32\u4f4d\u5b58\u653e\u5b50\u4e8b\u52a1\u7f16\u53f7&#xff0c;pg_subtrans\u7cfb\u7edf\u8868\u9700\u8981\u91cd\u5199\u3002\u4e24\u9636\u6bb5\u63d0\u4ea4prepared transaction\u6301\u4e45\u5316\u5b58\u50a8\u7684XID&#xff0c;\u8de8\u5b9e\u4f8b\u6301\u4e45\u5316\u65f6\u8981\u4fdd\u8bc164\u4f4d\u5bbd\u5ea6&#xff0c;pg_prepared_xacts\u7cfb\u7edf\u8868Schema\u4e5f\u9700\u8981\u6539\u52a8\u3002<\/p>\n<p>5. \u6d41\u590d\u5236\u534f\u8bae\u53d8\u66f4 \u6d41\u590d\u5236\u534f\u8baeWalDataMessage\u6d88\u606f\u5185\u90e8\u643a\u5e26xl_xid\u4e8b\u52a1\u53f7\u5b57\u6bb5\u3002\u5347\u7ea764\u4f4d\u4e4b\u540e&#xff0c;\u4e3b\u5e93\u4e0e\u4ece\u5e93\u5fc5\u987b\u540c\u6b65\u5347\u7ea7\u7248\u672c&#xff0c;\u8de8\u7248\u672c\u4e3b\u4ece\u590d\u5236\u94fe\u8def\u4f1a\u76f4\u63a5\u4e2d\u65ad&#xff0c;\u8fd9\u662fPG\u793e\u533a\u5341\u5206\u8c28\u614e\u7684\u5347\u7ea7\u95e8\u69db\u3002<\/p>\n<h3 id=\"%E4%B8%89%E3%80%81%E9%87%91%E4%BB%93V009R002C016%E7%89%88%E6%9C%AC%EF%BC%8C64%E4%BD%8DXID%E6%94%B9%E9%80%A0%E7%9A%84%E5%AE%9E%E9%99%85%E8%A6%86%E7%9B%96%E8%8C%83%E5%9B%B4\">\u4e09\u3001\u91d1\u4ed3V009R002C016\u7248\u672c&#xff0c;64\u4f4dXID\u6539\u9020\u7684\u5b9e\u9645\u8986\u76d6\u8303\u56f4<\/h3>\n<p>\u7814\u8bfb\u91d1\u4ed3V009R002C016\u7248\u672c\u8bf4\u660e\u4e66PDF\u6587\u6863&#xff08;L903\u3001L1012-1075\u7ae0\u8282&#xff09;&#xff0c;\u672c\u6b2164\u4f4dXID\u6539\u9020\u5e76\u975e\u6fc0\u8fdb\u7684\u5168\u6808\u91cd\u6784&#xff0c;\u800c\u662f\u517c\u987e\u517c\u5bb9\u6027\u4e0e\u7a33\u5b9a\u6027\u7684\u5de5\u7a0b\u53d6\u820d\u65b9\u6848\u3002<\/p>\n<h4 id=\"3.1%20%E5%AE%98%E6%96%B9%E6%96%87%E6%A1%A3%E6%98%8E%E7%A1%AE%E7%9A%84%E8%83%BD%E5%8A%9B%E6%8F%8F%E8%BF%B0\">3.1 \u5b98\u65b9\u6587\u6863\u660e\u786e\u7684\u80fd\u529b\u63cf\u8ff0<\/h4>\n<p>\u7248\u672c\u6587\u6863L903\u539f\u6587&#xff1a;\u652f\u630164\u4f4d\u4e8b\u52a1ID(XID)&#xff0c;\u907f\u514d\u56e032\u4f4d\u4e8b\u52a1ID\u56de\u6536\u4e0d\u53ca\u65f6\u6216\u957f\u4e8b\u52a1\u963b\u585e\u5bfc\u81f4\u7684\u4e1a\u52a1\u4e2d\u65ad\u95ee\u9898\u3002 L1012\u7ae0\u8282\u5199\u660e&#xff1a;\u4e3a\u9002\u914d64\u4f4d\u4e8b\u52a1ID&#xff0c;VACUUM\u4ee5\u53ca\u81ea\u52a8\u6e05\u7406Autovacuum\u76f8\u5173\u53c2\u6570\u7684\u6570\u636e\u7c7b\u578b\u3001\u53d6\u503c\u8303\u56f4\u540c\u6b65\u5347\u7ea7\u3002<\/p>\n<h4 id=\"3.2%20%E6%A0%B8%E5%BF%83%E6%94%B9%E5%8A%A8%EF%BC%9AVACUUM%E7%9B%B8%E5%85%B3%E5%8F%82%E6%95%B0%E5%8D%87%E7%BA%A7%E4%B8%BAint64%E7%B1%BB%E5%9E%8B\">3.2 \u6838\u5fc3\u6539\u52a8&#xff1a;VACUUM\u76f8\u5173\u53c2\u6570\u5347\u7ea7\u4e3aint64\u7c7b\u578b<\/h4>\n<p>\u6587\u6863\u4e2d\u5217\u51fa\u56db\u9879\u5173\u952e\u53c2\u6570\u7684\u53d8\u66f4&#xff1a;<\/p>\n<table>\n<tbody>\n<tr>\n<td>\u53c2\u6570<\/td>\n<td>\u4fee\u6539\u524d<\/td>\n<td>\u4fee\u6539\u540e<\/td>\n<\/tr>\n<tr>\n<td>vacuum_freeze_min_age<\/td>\n<td>integer&#xff0c;\u4e0a\u965010\u4ebf<\/td>\n<td>int64&#xff0c;\u4e0a\u96502\u2076\u2074-1&#xff08;\u7ea61.15\u00d710\u00b9\u2079&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>vacuum_freeze_table_age<\/td>\n<td>integer&#xff0c;\u4e0a\u965020\u4ebf<\/td>\n<td>int64&#xff0c;\u4e0a\u96502\u2076\u2074-1<\/td>\n<\/tr>\n<tr>\n<td>vacuum_multixact_freeze_min_age<\/td>\n<td>integer&#xff0c;\u4e0a\u965010\u4ebf<\/td>\n<td>int64&#xff0c;\u4e0a\u96502\u2076\u2074-1<\/td>\n<\/tr>\n<tr>\n<td>vacuum_multixact_freeze_table_age<\/td>\n<td>integer&#xff0c;\u4e0a\u965020\u4ebf<\/td>\n<td>int64&#xff0c;\u4e0a\u96502\u2076\u2074-1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u503c\u5f97\u6ce8\u610f&#xff1a;\u8fd9\u4e00\u7ec4\u53c2\u6570\u7684\u9ed8\u8ba4\u914d\u7f6e\u503c\u4fdd\u6301\u4e0d\u53d8&#xff0c;\u4f9d\u65e7\u6cbf\u7528\u539f\u6709200000000 \/ 400000000 \/ 10000000000 \/ 20000000000&#xff0c;\u4ec5\u4ec5\u6269\u5927\u4e86\u53c2\u6570\u4e0a\u9650\u3002 \u8fd9\u4e2a\u8bbe\u8ba1\u4ee3\u8868\u91d1\u4ed3\u5185\u7f6e\u4e86\u4e00\u595732\u4f4dXID\u8bed\u4e49\u4eff\u771f\u5c42\u3002\u539f\u6709PG\u751f\u6001\u7684\u4e1a\u52a1\u811a\u672c&#xff0c;\u51bb\u7ed3\u9608\u503c\u914d\u7f6e\u5b8c\u5168\u4e0d\u9700\u8981\u4fee\u6539&#xff0c;\u9ed8\u8ba4\u884c\u4e3a\u548cPostgreSQL\u4fdd\u6301\u4e00\u81f4\u3002 \u4ece\u5de5\u7a0b\u5c42\u9762\u89e3\u8bfb\u8fd9\u4e2a\u4fe1\u53f7&#xff1a;\u91d1\u4ed3\u5e76\u6ca1\u6709\u4fee\u6539tuple header\u5185\u90e8\u7684xmin\u5b57\u6bb5\u4e3a64\u4f4d\u3002\u5982\u679c\u5143\u7ec4\u5934\u90e8xmin\u6539\u4e3a64\u4f4d&#xff0c;\u51bb\u7ed3\u76f8\u5173\u53c2\u6570\u7684\u8bed\u4e49\u4f1a\u53d1\u751f\u6839\u672c\u6027\u53d8\u5316\u3002\u672c\u6b2164\u4f4dXID\u6539\u9020&#xff0c;\u91c7\u7528\u7684\u662f\u6269\u5c55\u4e8b\u52a1\u53f7\u5206\u914d\u7a7a\u95f4&#xff0c;\u6d88\u9664XID\u5faa\u73af\u590d\u7528\u7684\u65b9\u6848&#xff0c;tuple header\u5185\u90e8t_xmin\u4f9d\u65e7\u4fdd\u755932\u4f4d&#xff0c;\u4ecd\u7136\u4f9d\u9760frozen\u6807\u8bb0\u5b8c\u6210\u65e7\u4e8b\u52a1\u5904\u7406\u3002<\/p>\n<h4 id=\"3.3%20%E9%85%8D%E5%A5%97%E6%94%B9%E9%80%A0%EF%BC%9A%E5%AE%9E%E4%BE%8B%E7%BA%A7%E5%8A%A8%E6%80%81%E5%86%85%E5%AD%98%E7%AE%A1%E6%8E%A7\">3.3 \u914d\u5957\u6539\u9020&#xff1a;\u5b9e\u4f8b\u7ea7\u52a8\u6001\u5185\u5b58\u7ba1\u63a7<\/h4>\n<p>\u7248\u672c\u6587\u6863L903\u7d27\u63a5\u7740\u8bf4\u660e&#xff1a;\u5168\u9762\u652f\u630164\u4f4d\u4e8b\u52a1ID\u4e0e\u5b9e\u4f8b\u7ea7\u52a8\u6001\u5185\u5b58\u7ba1\u63a7&#xff0c;\u65b0\u589emax_dynamic_memory\u53c2\u6570&#xff0c;\u53ef\u4ee5\u5168\u5c40\u9650\u5236\u6570\u636e\u5e93\u5b9e\u4f8b\u5185\u5b58\u5360\u7528\u3002\u5f53\u5185\u5b58\u8d85\u51fa\u9608\u503c\u65f6&#xff0c;\u7cfb\u7edf\u4f1a\u89e6\u53d1\u660e\u786e\u544a\u8b66&#xff0c;\u964d\u4f4eOOM\u5185\u5b58\u6ea2\u51fa\u98ce\u9669\u3002<\/p>\n<p>\u8fd9\u662f64\u4f4dXID\u6539\u9020\u5fc5\u8981\u7684\u914d\u5957\u80fd\u529b\u300264\u4f4d\u4e8b\u52a1\u53f7\u62c9\u957f\u4e86\u4e8b\u52a1\u53f7\u751f\u547d\u5468\u671f&#xff0c;\u4e0d\u518d\u5faa\u73af\u590d\u7528&#xff0c;autovacuum\u540e\u53f0\u51bb\u7ed3\u4efb\u52a1\u6267\u884c\u9891\u6b21\u4e0b\u964d&#xff0c;\u540e\u53f0\u6e05\u7406\u538b\u529b\u51cf\u8f7b\u3002\u4f46\u957f\u4e8b\u52a1\u4f1a\u6301\u6709\u66f4\u5927\u7684XID\u7f13\u5b58&#xff0c;\u5355\u6b21\u4e8b\u52a1\u5185\u5b58\u5360\u7528\u5b58\u5728\u4e0a\u5347\u53ef\u80fd\u6027\u3002\u91d1\u4ed3\u540c\u6b65\u589e\u52a0\u5168\u5c40\u5185\u5b58\u4e0a\u9650\u7ba1\u63a7&#xff0c;\u89c4\u907f64\u4f4dXID\u6539\u9020\u5e26\u6765\u7684\u65b0\u589eOOM\u98ce\u9669\u3002<\/p>\n<h4 id=\"3.4%20%E5%8D%8F%E5%90%8C%E4%BC%98%E5%8C%96%EF%BC%9AFastPath%E9%94%81%E6%9C%BA%E5%88%B6%E5%8D%87%E7%BA%A7\">3.4 \u534f\u540c\u4f18\u5316&#xff1a;FastPath\u9501\u673a\u5236\u5347\u7ea7<\/h4>\n<p>\u6587\u6863L1299\u63d0\u5230&#xff1a;\u65b0\u589eFastPath\u9501\u673a\u5236&#xff0c;\u652f\u6301\u914d\u7f6eFastPath\u69fd\u4f4d\u6570\u91cf\u3001CLOG\u8f7b\u91cf\u9501\u5206\u533a\u6570\u3001CSNLOG\u8f7b\u91cf\u9501\u5206\u533a\u6570\u3002<\/p>\n<p>CSNLOG\u5373Commit Sequence Number Log&#xff0c;\u8bb0\u5f55\u4e8b\u52a1\u63d0\u4ea4\u987a\u5e8f\u3002\u8fc7\u53bbCSN\u4e3a32\u4f4d&#xff0c;\u8ddf\u968fXID\u5faa\u73af\u300264\u4f4dXID\u6539\u9020\u5fc5\u7136\u540c\u6b65\u8c03\u6574CSN\u903b\u8f91\u3002\u91d1\u4ed3\u540c\u6b65\u628aCSNLOG\u7684\u5168\u5c40\u5355\u9501\u6539\u9020\u4e3a\u53ef\u914d\u7f6e\u8f7b\u91cf\u5206\u533a\u9501&#xff0c;\u63d0\u5347\u9ad8\u5e76\u53d1\u573a\u666f\u4e0b\u9501\u7ade\u4e89\u6027\u80fd\u3002<\/p>\n<h3 id=\"%E5%9B%9B%E3%80%81%E9%9D%A2%E5%90%91%E5%85%A5%E9%97%A8%E8%AF%BB%E8%80%85%EF%BC%9A5%E4%B8%AA%E6%A0%B8%E5%BF%83%E7%9F%A5%E8%AF%86%E7%82%B9%EF%BC%8C%E5%BF%AB%E9%80%9F%E7%90%86%E8%A7%A364%E4%BD%8DXID\">\u56db\u3001\u9762\u5411\u5165\u95e8\u8bfb\u8005&#xff1a;5\u4e2a\u6838\u5fc3\u77e5\u8bc6\u70b9&#xff0c;\u5feb\u901f\u7406\u89e364\u4f4dXID<\/h3>\n<p>\u5982\u679c\u4f60\u521a\u521a\u63a5\u89e6PostgreSQL\u4f53\u7cfb\u6570\u636e\u5e93&#xff0c;\u672c\u8282\u642d\u5efa\u57fa\u7840\u8ba4\u77e5\u6a21\u578b&#xff0c;\u5feb\u901f\u770b\u61c2\u5e95\u5c42\u903b\u8f91\u3002<\/p>\n<h4 id=\"4.1%2032%E4%BD%8DXID%E7%9A%84%E5%9C%86%E7%8E%AF%E5%BE%AA%E7%8E%AF%E6%A8%A1%E5%9E%8B\">4.1 32\u4f4dXID\u7684\u5706\u73af\u5faa\u73af\u6a21\u578b<\/h4>\n<p>32\u4f4d\u67b6\u6784\u4e0b\u4e8b\u52a1\u53f7\u5982\u540c\u5706\u73af&#xff1a;<\/p>\n<p class=\"img-center\"><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"296\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/09\/20260918202015-6aad9cffc0323.png\" width=\"219\" \/><\/p>\n<p>\u6bcf\u4e00\u6761\u5143\u7ec4t_xmin\u843d\u5728\u5706\u73af\u4e0a\u7684\u67d0\u4e00\u4e2a\u4f4d\u7f6e\u3002\u53ef\u89c1\u6027\u5224\u65ad\u4f2a\u4ee3\u7801&#xff1a;<\/p>\n<p>if t_xmin &#061;&#061; frozen_xid:<br \/>\n    \u6c38\u4e45\u53ef\u89c1<br \/>\nelif t_xmin \u5728 frozen_xid \u987a\u65f6\u9488\u4e00\u4fa7&#xff1a;<br \/>\n    \u5c5e\u4e8e\u8fc7\u53bb\u4e8b\u52a1&#xff0c;\u4e00\u822c\u4e0d\u53ef\u89c1<br \/>\nelse:<br \/>\n    \u5c5e\u4e8e\u672a\u6765\u4e8b\u52a1&#xff0c;\u67e5\u8be2\u63d0\u4ea4\u65e5\u5fd7\u5224\u65ad\u662f\u5426\u63d0\u4ea4 <\/p>\n<p>\u5347\u7ea764\u4f4dXID\u4e4b\u540e&#xff0c;\u73af\u5f62\u7ed3\u6784\u8f6c\u53d8\u4e3a\u65e0\u9650\u5ef6\u957f\u7684\u76f4\u7ebf\u3002\u76f4\u63a5\u4f7f\u7528t_xmin &lt; \u5f53\u524d\u4e8b\u52a1\u5feb\u7167\u5224\u65ad\u53ef\u89c1\u6027&#xff0c;\u4e0d\u518d\u5b58\u5728\u5faa\u73af\u903b\u8f91\u3002\u51bb\u7ed3\u64cd\u4f5c&#xff0c;\u4e5f\u4ece\u89e3\u51b3\u5faa\u73af\u5371\u673a&#xff0c;\u8f6c\u53d8\u4e3a\u5e38\u89c4\u6570\u636e\u6e05\u7406\u5de5\u4f5c\u3002<\/p>\n<h4 id=\"4.2%20freeze%E5%86%BB%E7%BB%93%E5%88%B0%E5%BA%95%E5%9C%A8%E5%81%9A%E4%BB%80%E4%B9%88\">4.2 freeze\u51bb\u7ed3\u5230\u5e95\u5728\u505a\u4ec0\u4e48<\/h4>\n<p>freeze\u5e76\u4e0d\u4f1a\u5220\u9664\u5386\u53f2\u6570\u636e&#xff0c;\u53ea\u662f\u5bf9\u5143\u7ec4\u884c\u5934\u6253\u4e0a\u6807\u8bb0\u3002PG\u5728heap tuple header\u7684t_infomask\u9884\u7559\u4e24\u4e2abit\u4f4d&#xff1a;HEAP_XMIN_FROZEN\u3001HEAP_XMIN_INVALID\u3002\u6267\u884cfreeze\u65f6&#xff0c;\u5c06t_xmin\u66ff\u6362\u4e3aFrozenTransactionId&#061;2&#xff0c;\u6240\u6709\u4e8b\u52a1\u90fd\u4f1a\u8bc6\u522b\u8fd9\u6761\u8bb0\u5f55\u662f\u51bb\u7ed3\u72b6\u6001&#xff0c;\u4ee3\u8868\u8be5\u8bb0\u5f55\u65e9\u4e8e\u6240\u6709\u4e8b\u52a1&#xff0c;t_xmin\u5b57\u6bb5\u91ca\u653e\u51fa\u6765&#xff0c;\u7528\u4e8e\u5faa\u73af\u590d\u7528\u3002<\/p>\n<p>\u91d1\u4ed3\u672c\u6b21\u65b9\u6848\u4e2d&#xff0c;\u8fd9\u5957\u6807\u8bb0\u673a\u5236\u4ecd\u7136\u4fdd\u7559&#xff0c;\u6839\u6e90\u662ftuple header\u5b57\u6bb5\u5bbd\u5ea6\u6ca1\u6709\u6539\u52a8\u3002\u4f46\u662f\u89e6\u53d1\u51bb\u7ed3\u7684\u9891\u7387\u4f1a\u5927\u5e45\u4e0b\u964d\u3002XID\u4e0d\u518d\u5faa\u73af&#xff0c;frozen\u5206\u754c\u70b9\u4e0d\u518d\u662f\u5706\u73af\u4e00\u534a\u4f4d\u7f6e&#xff0c;\u4ec5\u7528\u4e8e\u6e05\u7406\u4e1a\u52a1\u957f\u671f\u7559\u5b58\u7684\u8d85\u5386\u53f2\u6570\u636e\u3002<\/p>\n<h4 id=\"4.3%2064%E4%BD%8DXID%E5%B8%A6%E6%9D%A5%E7%9A%84%E7%9C%9F%E5%AE%9E%E4%B8%9A%E5%8A%A1%E6%94%B6%E7%9B%8A\">4.3 64\u4f4dXID\u5e26\u6765\u7684\u771f\u5b9e\u4e1a\u52a1\u6536\u76ca<\/h4>\n<p>\u9ad8\u5199\u5165\u4e1a\u52a1\u573a\u666f&#xff0c;64\u4f4dXID\u76f4\u63a5\u6839\u9664\u4e00\u7cfb\u5217\u91cd\u5927\u98ce\u9669&#xff1a;<\/p>\n<ul>\n<li>\n<p>\u6d88\u9664\u51bb\u7ed3\u98ce\u66b4\u6839\u6e90&#xff0c;\u4e0d\u518d\u9700\u8981\u62c5\u5fc3\u4e8b\u52a1\u53f7\u63a5\u8fd1\u534a\u5706\u8017\u5c3d\u7684\u7d27\u6025\u98ce\u9669<\/p>\n<\/li>\n<li>\n<p>autovacuum\u4e0d\u518d\u6709\u5fc5\u987b\u5b8c\u6210\u51bb\u7ed3\u7684\u786c\u6027\u7ea6\u675f&#xff0c;vacuum\u6267\u884c\u7f13\u6162\u4e5f\u4e0d\u4f1a\u76f4\u63a5\u5f15\u53d1\u5b95\u673a<\/p>\n<\/li>\n<li>\n<p>\u957f\u4e8b\u52a1\u4e0d\u518d\u6324\u5360\u51bb\u7ed3\u7a7a\u95f4&#xff0c;\u675c\u7edd\u957f\u4e8b\u52a1\u5f15\u53d1\u5f3a\u5236\u505c\u5e93\u51bb\u7ed3\u7684\u6781\u7aef\u6545\u969c<\/p>\n<\/li>\n<li>\n<p>\u4ece\u5e93\u4e0d\u518d\u8ddf\u968f\u4e3b\u5e93\u51bb\u7ed3\u64cd\u4f5c\u4ea7\u751f\u5de8\u5927\u5ef6\u8fdf&#xff0c;\u4e3b\u4ece\u5ef6\u8fdf\u548c\u51bb\u7ed3\u64cd\u4f5c\u89e3\u8026<\/p>\n<\/li>\n<\/ul>\n<p>\u4f46\u9700\u8981\u5ba2\u89c2\u533a\u5206\u80fd\u529b\u8fb9\u754c&#xff0c;64\u4f4dXID\u4e0d\u80fd\u89e3\u51b3\u4e0b\u9762\u95ee\u9898&#xff1a;<\/p>\n<ul>\n<li>\n<p>\u8868\u81a8\u80c0bloat&#xff0c;\u4ecd\u7136\u4f9d\u9760vacuum\/autovacuum\u6e05\u7406\u6b7b\u5143\u7ec4<\/p>\n<\/li>\n<li>\n<p>\u957f\u4e8b\u52a1\u6301\u6709\u7684\u9501\u8d44\u6e90&#xff0c;\u4f9d\u65e7\u4f1a\u963b\u585eDDL\u8bed\u53e5\u6267\u884c<\/p>\n<\/li>\n<\/ul>\n<h4 id=\"4.4%20autovacuum%E8%B0%83%E4%BC%98%E9%80%BB%E8%BE%91%E5%8F%91%E7%94%9F%E6%9C%AC%E8%B4%A8%E5%8F%98%E5%8C%96\">4.4 autovacuum\u8c03\u4f18\u903b\u8f91\u53d1\u751f\u672c\u8d28\u53d8\u5316<\/h4>\n<p>32\u4f4dXID\u65f6\u4ee3&#xff0c;autovacuum_vacuum_insert_scale_factor\u3001vacuum_freeze_table_age\u3001vacuum_freeze_min_age\u5c5e\u4e8e\u786c\u6027\u65f6\u95f4\u7a97\u53e3\u7ea6\u675f&#xff0c;\u5fc5\u987b\u5728\u6d88\u801720\u4ebf\u4e8b\u52a1\u53f7\u524d\u5b8c\u6210\u51bb\u7ed3\u3002 64\u4f4dXID\u573a\u666f\u4e0b&#xff0c;\u8fd9\u4e9b\u53c2\u6570\u8f6c\u53d8\u4e3a\u5e38\u89c4\u6e05\u7406\u7b56\u7565\u914d\u7f6e\u3002DBA\u53ef\u4ee5\u9009\u62e9\u66f4\u52a0\u6fc0\u8fdb\u7684\u6e05\u7406\u7b56\u7565&#xff0c;\u5c31\u7b97\u51bb\u7ed3\u6267\u884c\u4e0d\u53ca\u65f6&#xff0c;\u6570\u636e\u5e93\u4e5f\u4e0d\u4f1a\u7acb\u523b\u5b95\u673a\u3002\u91d1\u4ed3\u4fdd\u7559\u539f\u6709\u53c2\u6570\u9ed8\u8ba4\u503c&#xff0c;\u5c31\u662f\u4e3a\u4e86\u8ba9\u539f\u6709PG\u8fd0\u7ef4\u7ecf\u9a8c\u53ef\u4ee5\u5e73\u6ed1\u590d\u7528&#xff0c;\u964d\u4f4eDBA\u5b66\u4e60\u6210\u672c\u3002<\/p>\n<h4 id=\"4.5%20%E5%92%8C%E4%B8%BB%E4%BB%8E%E5%A4%8D%E5%88%B6%E3%80%81%E5%A4%87%E4%BB%BD%E6%81%A2%E5%A4%8D%E7%9A%84%E5%85%B3%E8%81%94\">4.5 \u548c\u4e3b\u4ece\u590d\u5236\u3001\u5907\u4efd\u6062\u590d\u7684\u5173\u8054<\/h4>\n<p>32\u4f4dXID\u67b6\u6784\u4e0b&#xff0c;\u5907\u5e93standby\u540c\u6837\u9700\u8981\u8ba1\u7b97xmin&#xff0c;\u540c\u6837\u4f1a\u906d\u9047\u51bb\u7ed3\u98ce\u66b4\u3002\u5347\u7ea764\u4f4dXID\u4e4b\u540e&#xff0c;\u5907\u5e93\u51bb\u7ed3\u538b\u529b\u663e\u8457\u964d\u4f4e\u3002\u4f46\u5907\u5e93\u5207\u6362\u3001\u4e3b\u4ece\u5207\u6362\u573a\u666f&#xff0c;\u4f9d\u65e7\u9700\u8981\u6821\u9a8c\u4e3b\u4eceXID\u7248\u672c\u517c\u5bb9\u6027\u3002\u91d1\u4ed3\u7248\u672c\u6587\u6863\u6ca1\u6709\u9488\u5bf9\u8fd9\u90e8\u5206\u8be6\u7ec6\u8bf4\u660e&#xff0c;\u63a8\u6d4b\u8be5\u6a21\u5757\u5c1a\u672a\u5168\u90e8\u5b8c\u6210\u6539\u9020&#xff0c;\u6216\u662f\u91c7\u7528\u4e3b\u4ece\u5b9e\u4f8b\u5fc5\u987b\u4fdd\u6301\u76f8\u540c\u7248\u672c\u7684\u9650\u5236\u7b56\u7565&#xff0c;\u7c7b\u4f3cPG\u5927\u7248\u672c\u5347\u7ea7\u7684\u7ea6\u675f\u3002<\/p>\n<h3 id=\"%E4%BA%94%E3%80%81%E9%9D%A2%E5%90%91%E5%86%85%E6%A0%B8%E4%B8%93%E5%AE%B6%EF%BC%9A%E5%BA%95%E5%B1%82%E5%AE%9E%E7%8E%B0%E7%BB%86%E8%8A%82%E6%B7%B1%E5%BA%A6%E8%A7%A3%E8%AF%BB\">\u4e94\u3001\u9762\u5411\u5185\u6838\u4e13\u5bb6&#xff1a;\u5e95\u5c42\u5b9e\u73b0\u7ec6\u8282\u6df1\u5ea6\u89e3\u8bfb<\/h3>\n<p>\u5982\u679c\u4f60\u662fPG\u5185\u6838\u5f00\u53d1\u8005\u3001\u8d44\u6df1DBA&#xff0c;\u672c\u8282\u76f8\u5f53\u4e8e\u91d1\u4ed3\u672c\u6b21\u6539\u9020\u7684\u5b9e\u73b0\u7b14\u8bb0\u3002<\/p>\n<h4 id=\"5.1%20%E6%95%B0%E6%8D%AE%E7%B1%BB%E5%9E%8B%E5%B1%82%E9%9D%A2%E7%9A%84%E5%B7%A5%E7%A8%8B%E5%8F%96%E8%88%8D\">5.1 \u6570\u636e\u7c7b\u578b\u5c42\u9762\u7684\u5de5\u7a0b\u53d6\u820d<\/h4>\n<p>\u57fa\u4e8e\u7248\u672c\u6587\u6863\u53cd\u5411\u63a8\u5bfc&#xff0c;\u91d1\u4ed3\u5185\u90e8XID\u5b9a\u4e49\u5927\u81f4\u5982\u4e0b&#xff1a;<\/p>\n<p>typedef uint64 kingbase_xid;        \/\/ 64\u4f4d\u7528\u4e8e\u4e8b\u52a1\u53f7\u5206\u914d<br \/>\ntypedef uint32 kingbase_tup_xmin;   \/\/ tuple header\u5185\u90e8xmin\u4f9d\u65e732\u4f4d<br \/>\ntypedef uint32 kingbase_tup_xmax;   \/\/ tuple header\u5185\u90e8xmax\u4f9d\u65e732\u4f4d <\/p>\n<p>\u4e5f\u5c31\u662f\u5206\u914d\u5c42\u4f7f\u752864\u4f4d&#xff0c;\u5143\u7ec4\u5934\u90e8\u7ef4\u630132\u4f4d\u7684\u6df7\u5408\u65b9\u6848&#xff0c;\u548cPG\u793e\u533a\u8ba8\u8bba\u7684xid8\u601d\u8def\u76f8\u4f3c&#xff1a;xid8\u7528\u4e8e\u7cfb\u7edf\u8868\u3001\u4e8b\u52a1\u5feb\u7167\u3001WAL\u65e5\u5fd7&#xff0c;tuple header\u4fdd\u630132\u4f4d&#xff0c;\u4f9d\u9760frozen bit\u6807\u8bb0\u51bb\u7ed3xmin\u3002<\/p>\n<p>\u8fd9\u5957\u65b9\u6848\u4f18\u52bf\u660e\u663e&#xff1a;<\/p>\n<li>\n<p>\u65e0\u9700\u6539\u52a8tuple header\u5927\u5c0f&#xff0c;\u539f\u6709\u6570\u636e\u9875\u5b8c\u5168\u517c\u5bb9&#xff0c;\u5b58\u91cf\u6570\u636e\u4e0d\u7528\u8fc1\u79fb<\/p>\n<\/li>\n<li>\n<p>CLOG\u539f\u6709\u5b58\u50a8\u7ed3\u6784\u4e0d\u7528\u91cd\u6784<\/p>\n<\/li>\n<li>\n<p>\u7248\u672c\u5347\u7ea7\u8def\u5f84\u5e73\u6ed1&#xff0c;\u4e3b\u4ece\u8282\u70b9\u4e0d\u9700\u8981\u540c\u65f6\u4e00\u6b21\u6027\u5347\u7ea7<\/p>\n<\/li>\n<li>\n<p>\u8fd0\u7ef4\u53c2\u6570\u9ed8\u8ba4\u884c\u4e3a\u4e0d\u53d8&#xff0c;\u964d\u4f4eDBA\u8fc1\u79fb\u6210\u672c<\/p>\n<\/li>\n<p>\u5bf9\u5e94\u7684\u4ee3\u4ef7&#xff1a;<\/p>\n<li>\n<p>tuple header\u4f9d\u65e7\u4f9d\u8d56freeze\u673a\u5236&#xff0c;\u4ec5\u4ec5\u964d\u4f4e\u89e6\u53d1\u9891\u6b21<\/p>\n<\/li>\n<li>\n<p>\u5355\u8868\u53d7\u9650\u4e8etuple header32\u4f4d&#xff0c;\u4ecd\u7136\u5b58\u572843\u4ebf\u4e8b\u52a1\u7684\u4e0a\u9650\u7ea6\u675f<\/p>\n<\/li>\n<h4 id=\"5.2%2032%E4%BD%8D%E5%8D%87%E7%BA%A764%E4%BD%8D%EF%BC%8Cautovacuum%E5%88%86%E9%98%B6%E6%AE%B5%E8%B0%83%E4%BC%98%E5%BB%BA%E8%AE%AE\">5.2 32\u4f4d\u5347\u7ea764\u4f4d&#xff0c;autovacuum\u5206\u9636\u6bb5\u8c03\u4f18\u5efa\u8bae<\/h4>\n<p>\u5df2\u7ecf\u90e8\u7f72\u91d1\u4ed3V009R002C016\u7248\u672c\u7684DBA&#xff0c;\u53ef\u4ee5\u91c7\u7528\u4e09\u9636\u6bb5\u8c03\u4f18\u7b56\u7565&#xff1a;<\/p>\n<p>&#8212; \u7b2c\u4e00\u9636\u6bb5&#xff1a;\u8fc1\u79fb\u8fc7\u6e21\u671f&#xff08;1~3\u4e2a\u6708&#xff09;<br \/>\n&#8212; \u7ef4\u6301\u539f\u6709PG\u7ecf\u9a8c\u914d\u7f6e&#xff0c;\u4e0d\u4fee\u6539freeze\u53c2\u6570&#xff0c;\u89c2\u5bdf\u51bb\u7ed3\u9891\u7387<\/p>\n<p>&#8212; \u7b2c\u4e8c\u9636\u6bb5&#xff1a;\u4f18\u5316\u671f&#xff08;3~6\u4e2a\u6708&#xff09;<br \/>\nALTER SYSTEM SET vacuum_freeze_min_age &#061; 50000000;<br \/>\nALTER SYSTEM SET autovacuum_freeze_max_age &#061; 1000000000;<\/p>\n<p>&#8212; \u7b2c\u4e09\u9636\u6bb5&#xff1a;\u7a33\u5b9a\u8fd0\u884c\u671f&#xff08;6\u4e2a\u6708\u4ee5\u4e0a&#xff09;<br \/>\n&#8212; \u6839\u636e\u4e1a\u52a1\u8d1f\u8f7d\u8c03\u4f18&#xff0c;\u53ef\u5c06freeze_age\u8bbe\u7f6e\u81f3\u66f4\u5927\u6570\u503c<br \/>\nALTER SYSTEM SET vacuum_freeze_table_age &#061; 5000000000; <\/p>\n<h4 id=\"5.3%20%E5%92%8CPG%2016%2F17%2F18%E7%89%88%E6%9C%AC%E6%A8%AA%E5%90%91%E5%AF%B9%E6%AF%94\">5.3 \u548cPG 16\/17\/18\u7248\u672c\u6a2a\u5411\u5bf9\u6bd4<\/h4>\n<p>PG16\u5f15\u5165xid8\u6570\u636e\u7c7b\u578b&#xff0c;\u4ec5\u4ec5\u652f\u6301\u7528\u6237\u8868\u5b58\u50a864\u4f4d\u4e8b\u52a1\u5b57\u6bb5&#xff0c;\u6570\u636e\u5e93\u5185\u6838\u5185\u90e8\u4e8b\u52a1\u5206\u914d\u53f7\u4f9d\u65e7\u662f32\u4f4d\u3002 PG17\u5bf9transaction_id\u76f8\u5173\u4f18\u5316\u96c6\u4e2d\u5728multixact\u591a\u4e8b\u52a1\u95ee\u9898&#xff0c;\u6ca1\u6709\u4fee\u6539\u6838\u5fc3XID\u3002 PG18\u90ae\u4ef6\u5217\u8868\u867d\u7136\u8ba8\u8bba\u5168\u91cf64\u4f4dXID\u65b9\u6848&#xff0c;\u4f46\u662f\u6539\u52a8\u98ce\u9669\u8fc7\u9ad8&#xff0c;\u81f3\u4eca\u6ca1\u6709\u6b63\u5f0fRFC\u3002 \u91d1\u4ed3V9\u7684\u4ef7\u503c&#xff0c;\u662f\u4e1a\u5185\u9996\u4e2a\u628a64\u4f4dXID\u4e8b\u52a1\u53f7\u5206\u914d\u80fd\u529b\u843d\u5730\u81f3\u751f\u4ea7\u73af\u5883\u7684PG\u7cfb\u56fd\u4ea7\u6570\u636e\u5e93\u3002<\/p>\n<h4 id=\"5.4%20%E5%A4%9A%E6%95%B0%E6%8D%AE%E5%BA%93%E6%A8%AA%E5%90%91%E5%AF%B9%E6%AF%94\">5.4 \u591a\u6570\u636e\u5e93\u6a2a\u5411\u5bf9\u6bd4<\/h4>\n<table>\n<tbody>\n<tr>\n<td>\u6570\u636e\u5e93<\/td>\n<td>\u4e8b\u52a1\u53f7\u5bbd\u5ea6<\/td>\n<td>freeze\u673a\u5236<\/td>\n<td>\u5907\u6ce8<\/td>\n<\/tr>\n<tr>\n<td>PostgreSQL<\/td>\n<td>32\u4f4d<\/td>\n<td>freeze &#043; autovacuum<\/td>\n<td>32\u4f4dXID\u5faa\u73af\u590d\u7528<\/td>\n<\/tr>\n<tr>\n<td>Oracle<\/td>\n<td>SCN\u5185\u90e86\u5b57\u8282<\/td>\n<td>undo &#043;\u591a\u7248\u672c<\/td>\n<td>\u4e0d\u5b58\u5728XID\u5faa\u73af\u95ee\u9898<\/td>\n<\/tr>\n<tr>\n<td>MySQL InnoDB<\/td>\n<td>6\u5b57\u8282TRX_ID<\/td>\n<td>undo log<\/td>\n<td>\u4e0d\u5b58\u5728XID\u5faa\u73af\u95ee\u9898<\/td>\n<\/tr>\n<tr>\n<td>KingbaseES V9<\/td>\n<td>64\u4f4d\u5206\u914d\u5c42<\/td>\n<td>\u6df7\u5408\u65b9\u6848&#xff0c;tuple header32\u4f4d<\/td>\n<td>\u56fd\u4ea7\u9996\u4e2a\u751f\u4ea7\u53ef\u752864\u4f4dXID<\/td>\n<\/tr>\n<tr>\n<td>zheap \/ zedstore<\/td>\n<td>64\u4f4dTID<\/td>\n<td>\u65e0\u9700freeze<\/td>\n<td>\u4ec5\u5b9e\u9a8c\u9879\u76ee&#xff0c;\u672a\u751f\u4ea7\u843d\u5730<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u6a2a\u5411\u5bf9\u6bd4\u53ef\u4ee5\u770b\u51fa&#xff0c;\u91d1\u4ed3\u9009\u62e9\u7684\u662f\u300cPG\u539f\u751f\u751f\u6001\u517c\u5bb9 &#043; \u6269\u5c55XID\u5206\u914d\u7a7a\u95f4\u300d\u6e10\u8fdb\u8def\u7ebf&#xff0c;\u6ca1\u6709\u50cfzheap\u4e00\u6837\u5f7b\u5e95\u91cd\u5199tuple header\u3002\u8fd9\u548c\u91d1\u4ed3\u957f\u671f\u575a\u6301\u7684Oracle\u517c\u5bb9\u8def\u7ebf\u4e00\u8109\u76f8\u627f&#xff1a;\u4e0d\u7834\u574f\u73b0\u6709\u751f\u6001&#xff0c;\u9488\u5bf9\u6838\u5fc3\u75db\u70b9\u505a\u5e95\u5c42\u6269\u5c55\u3002<\/p>\n<h3 id=\"%E5%85%AD%E3%80%81%E9%87%91%E4%BB%93%E6%9C%AC%E6%AC%A1%E6%94%B9%E9%80%A0%EF%BC%8C%E5%B8%A6%E7%BB%99PG%E7%A4%BE%E5%8C%BA%E7%9A%84%E5%90%AF%E5%8F%91\">\u516d\u3001\u91d1\u4ed3\u672c\u6b21\u6539\u9020&#xff0c;\u5e26\u7ed9PG\u793e\u533a\u7684\u542f\u53d1<\/h3>\n<p>\u91d1\u4ed3\u768464\u4f4dXID\u5de5\u7a0b\u5b9e\u8df5&#xff0c;\u7ed9PostgreSQL\u793e\u533a\u63d0\u4f9b\u4e09\u6761\u6709\u53c2\u8003\u4ef7\u503c\u7684\u5b9e\u73b0\u601d\u8def\u3002<\/p>\n<h4 id=\"6.1%20%E6%B8%90%E8%BF%9B%E5%BC%8FXID%E6%89%A9%E5%B1%95%E6%96%B9%E6%A1%88\">6.1 \u6e10\u8fdb\u5f0fXID\u6269\u5c55\u65b9\u6848<\/h4>\n<p>PG\u793e\u533a\u8ba8\u8bba\u5168\u91cf64\u4f4dXID\u6700\u5927\u987e\u8651\u5c31\u662f\u7834\u574ftuple header\u517c\u5bb9\u6027\u3002\u91d1\u4ed3\u91c7\u7528\u5206\u914d\u5c4264\u4f4d\u3001\u5143\u7ec4\u5934\u90e8\u4fdd\u755932\u4f4d\u7684\u5206\u5c42\u65b9\u6848&#xff0c;\u5728\u4e0d\u6539\u52a8page\u5b58\u50a8\u683c\u5f0f\u7684\u524d\u63d0\u4e0b&#xff0c;\u5c06\u4e8b\u52a1\u53f7\u7a7a\u95f4\u4ece43\u4ebf\u63d0\u5347\u81f32\u2076\u2074&#xff0c;\u4ec5\u589e\u52a0\u4e00\u5c42\u5206\u914d\u53f7\u6620\u5c04\u5230tuple xmin\u7684\u903b\u8f91&#xff0c;\u8fd9\u6761\u6e10\u8fdb\u8def\u7ebf\u503c\u5f97PG\u793e\u533a\u53c2\u8003\u3002<\/p>\n<h4 id=\"6.2%20%E9%BB%98%E8%AE%A4%E5%8F%82%E6%95%B0%E4%B8%8D%E5%8F%98%E7%9A%84%E5%85%BC%E5%AE%B9%E6%80%A7%E8%AE%BE%E8%AE%A1\">6.2 \u9ed8\u8ba4\u53c2\u6570\u4e0d\u53d8\u7684\u517c\u5bb9\u6027\u8bbe\u8ba1<\/h4>\n<p>\u5347\u7ea7\u51bb\u7ed3\u53c2\u6570\u65f6&#xff0c;\u4fdd\u6301\u539f\u6709\u9ed8\u8ba4\u503c\u4e0d\u53d8&#xff0c;\u4ec5\u4ec5\u6269\u5927\u53c2\u6570\u4e0a\u9650\u3002\u8fd9\u4e2a\u7ec6\u8282\u964d\u4f4eDBA\u8fc1\u79fb\u7684\u5fc3\u667a\u8d1f\u62c5&#xff0c;\u662f\u975e\u5e38\u4f18\u79c0\u7684\u517c\u5bb9\u6027\u8bbe\u8ba1\u3002\u5982\u679cPG\u793e\u533a\u672a\u6765\u63a8\u8fdb\u540c\u7c7b\u6539\u9020&#xff0c;\u8fd9\u79cd\u601d\u8def\u5177\u5907\u5f88\u9ad8\u53c2\u8003\u4ef7\u503c\u3002<\/p>\n<h4 id=\"6.3%20%E9%87%8D%E6%96%B0%E7%90%86%E8%A7%A3freeze%E7%9A%84%E5%AE%9A%E4%BD%8D\">6.3 \u91cd\u65b0\u7406\u89e3freeze\u7684\u5b9a\u4f4d<\/h4>\n<p>32\u4f4dXID\u65f6\u4ee3&#xff0c;freeze\u662f\u7528\u6765\u89e3\u51b3\u4e8b\u52a1\u53f7\u5faa\u73af\u7684\u7d27\u6025\u8fd0\u7ef4\u4efb\u52a1&#xff1b;64\u4f4dXID\u4e0b&#xff0c;freeze\u56de\u5f52\u4e3a\u5e38\u89c4\u6570\u636e\u6e05\u7406\u52a8\u4f5c\u3002\u8bed\u4e49\u7684\u8f6c\u53d8&#xff0c;\u4f1a\u5f7b\u5e95\u6539\u53d8autovacuum\u8c03\u4f18\u7684\u5e95\u5c42\u601d\u8def\u3002DBA\u4e0d\u518d\u9700\u8981\u7cbe\u5bc6\u8ba1\u7b97\u51bb\u7ed3\u7a97\u53e3&#xff0c;\u53ea\u9700\u8981\u6839\u636e\u4e1a\u52a1\u9700\u6c42\u6e05\u7406\u6b7b\u5143\u7ec4\u3002<\/p>\n<h3 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