https://pg-internal.com道阻且长,行则将至PGStonehttp://www.rssboard.org/rss-specificationpython-feedgenhttps://avatars.githubusercontent.com/u/5057571?s=96&v=4https://pg-internal.comThu, 06 Aug 2026 14:43:38 +0000PGStone60PGStonehttps://pg-internal.com/post/shen-ru-li-jie-PostgreSQL-Memory-Context-2.html七、超大内存分配策略 7.1 要点 AllocSet 的 maxBlockSize (8MB) 并不是单次分配的上限。https://pg-internal.com/post/shen-ru-li-jie-PostgreSQL-Memory-Context-2.htmlMon, 20 Apr 2026 05:50:35 +0000https://pg-internal.com/post/shen-ru-li-jie-PostgreSQL-Memory-Context-1.html之前分析了pg的共享缓存管理原理，这次分析一下私有内存的管理：memory context。https://pg-internal.com/post/shen-ru-li-jie-PostgreSQL-Memory-Context-1.htmlMon, 20 Apr 2026 05:44:52 +0000https://pg-internal.com/post/PostgreSQL-Ring-Buffer-ji-zhi-xiang-jie.html1. 概述 1.1 什么是 Buffer Ring PostgreSQL 的 Ring Buffer 是一种**后端私有的缓冲区访问策略**（Buffer Access Strategy），用于优化特定场景下的缓冲区使用。https://pg-internal.com/post/PostgreSQL-Ring-Buffer-ji-zhi-xiang-jie.htmlTue, 03 Feb 2026 11:53:38 +0000https://pg-internal.com/post/shen-ru-li-jie-postgresql-buffer-usage_count.html1. 概述 `usagecount`（使用计数）是 PostgreSQL 缓冲区管理中实现**时钟扫描（Clock Sweep）算法**的核心数据结构。https://pg-internal.com/post/shen-ru-li-jie-postgresql-buffer-usage_count.htmlMon, 26 Jan 2026 11:22:13 +0000https://pg-internal.com/post/shen-ru-li-jie-PostgreSQL_Buffer_Pin-ji-zhi.html一、Buffer Pin 的本质：三个字——'不准动' 1.1 核心定义 **Pin**（钉住）的含义非常简单： 只要有进程对某个 Buffer 持有 Pin，这个 Buffer 就**绝对不会**被淘汰替换。https://pg-internal.com/post/shen-ru-li-jie-PostgreSQL_Buffer_Pin-ji-zhi.htmlSun, 11 Jan 2026 14:37:15 +0000https://pg-internal.com/post/shen-ru-tan-suo-PostgreSQL-18-de-xin-te-xing.html译自：https://xata.io/blog/going-down-the-rabbit-hole-of-postgres-18-features 部分内容略作修改 上周，PostgreSQL 18 已被标记为稳定版本。https://pg-internal.com/post/shen-ru-tan-suo-PostgreSQL-18-de-xin-te-xing.htmlThu, 16 Oct 2025 08:42:17 +0000https://pg-internal.com/post/pg_rewind-wei-shen-me-xu-yao-kai-qi-wal_log_hins.html一、`wal_log_hints`参数作用 （一）Hint bits机制概述 在PostgreSQL中，Hint bits是一种用于优化性能的重要机制，它存储在元组（tuple）头部。https://pg-internal.com/post/pg_rewind-wei-shen-me-xu-yao-kai-qi-wal_log_hins.htmlFri, 16 May 2025 07:52:02 +0000https://pg-internal.com/post/PG-can-shu-autovacuum_naptime-jie-xi.htmlPG autovacuum_naptime 介绍 autovacuum_naptime 参数官方文档描述如下： ```yaml Specifies the minimum delay between autovacuum runs on...https://pg-internal.com/post/PG-can-shu-autovacuum_naptime-jie-xi.htmlFri, 07 Mar 2025 09:42:34 +0000https://pg-internal.com/post/PG-can-shu-maintenance_work_mem-jie-xi.htmlPG maintenance_work_mem介绍 PG 垃圾回收有关的内存参数是maintenance_work_mem或autovacuum_work_mem，如果没有设置autovacuum_work_mem，则使用maintena...https://pg-internal.com/post/PG-can-shu-maintenance_work_mem-jie-xi.htmlThu, 20 Feb 2025 07:25:23 +0000https://pg-internal.com/post/chu-li-PostgreSQL-cuo-wu-found-xmin-...-from-before-relfrozenxid-....html我已经看到标题中报告的错误多次了。https://pg-internal.com/post/chu-li-PostgreSQL-cuo-wu-found-xmin-...-from-before-relfrozenxid-....htmlWed, 12 Feb 2025 08:18:23 +0000https://pg-internal.com/post/xi-shuo-vacuum-de-truncate-cao-zuo.html引入 表级别的storage parameter参数vacuum_truncate是在PG12后引入的，加入该参数用来控制是否回收表尾部的空闲空间，在之前的版本中默认是一直回收表尾部的空闲空间。https://pg-internal.com/post/xi-shuo-vacuum-de-truncate-cao-zuo.htmlFri, 10 Jan 2025 08:17:32 +0000https://pg-internal.com/post/PG-zhi-du-suo-yin-you-hua.html现在是圣诞节，我的日常工作相对安静，所以让我们再次让它成为故事时间！另一个来自战壕的故事：一个表和一个索引会出错吗？ 几周前，一位用户问我为什么其中一个查询的 “性能不一致”。https://pg-internal.com/post/PG-zhi-du-suo-yin-you-hua.htmlThu, 02 Jan 2025 09:54:28 +0000https://pg-internal.com/about.html本人DBA一枚，熟悉数据库的运维，也从事过中间件和大数据的运维。https://pg-internal.com/about.htmlSat, 07 Dec 2024 10:52:22 +0000