在PG的众多参数中，参数checkpoint相关的几个参数颇为神秘。这些参数与checkpoint的调度有关，对系统的稳定性还是比较重要的，下面我们为大家解析一下，这要先从PG的数据同步机制谈起。 PG的数据同步机制众所周知，数据库的后台进程在执行用户事务时，发生的数据更改是先写入缓冲池中，对应PG就是shared buffers。PG的缓冲池一般设置为总内存的1/4左右，缓冲池里面的这些数据....

文章 2016-05-23 来自：开发者社区

数据库内核月报－ 2015 / 09-PgSQL · 特性分析 · clog异步提交一致性、原子操作与fsync

本文分为三节，分别介绍clog的fsync频率，原子操作，与异步提交一致性。 PostgreSQL pg_clog fsync 频率分析分析一下pg_clog是在什么时候需要调用fsync的？首先引用wiki里的一段pg_clog的介绍 Some details here are in src/backend/access/transam/README: 1. “pg_clog recor.....

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