PostgreSQL复制集群概要
PostgreSQ的复制、高可用、负载均衡相关集群，这儿写个概要备查。PostgreSQ有以下各种基于复制的集群方案，多数配过，有的当时没
PostgreSQ的复制、高可用、负载均衡相关集群，这儿写个概要备查。
PostgreSQ有以下各种基于复制的集群方案，多数配过，，有的当时没有整理。现在网上也有很多这些集群配置的文档，在这篇文档后找完备点的集中一下备档，不用每次用时到处查。
基于流复制的功能内置、触发器主从复制slony，基于sql复制的PostgreSQpool-II，其它如同步多主复制EDB MMR（这个也支持异步复制，玩过的时间有点长了，后面要找到当年记录再总结），异步多主复制Bucardo，文件系统级别复制DRDB，共享磁盘失败切换NAS以后看情况补。
slony-i主从复制：主服务器异步发送数据改变到备服务器。基于触发器，表行级复制；主服务器可能overhead；不用等其它服务器可以结束事务；只有异步复制，可能丢失数据；备服务器支持只读查询；表级粒度；无冲突；需要开发人员维护写入都请求master，读请求都走slave机器？？？
现在有了内置的流复制功能，以后应该鲜有用slony的了吧！
PostgreSQpool－II：复制sql语句；支持多主；无主服务器overhead；所有服务器完成方可结束事务；不会丢失数据；从服务器支持只读查询；库级别复制？？？；需要冲突解决机制
流复制
复制wal日志；无主服务器overhead；异步复制不用等其它服务器可以结束事务；同步复制不会丢失数据；从服务器支持只读查询；实例级粒度；无冲突
另外，plproxy是skype开发的一个数据库组件。虽然plproxy只能做水平分片，把它也放到这儿。plproxy是skype开发的数据库组件。在使用过程中，需要考虑带宽和本地缓存等问题。它限制代理库数是2的次方。proxy在自定义的函数上实现转发功能。这要求实际应用中 需要把大量的业务逻辑放到PostgreSQL服务器端来完成，降低了灵活度。也给以后可能的数据库迁移带来了挑战。
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CentOS 6.3环境下yum安装PostgreSQL 9.3
PostgreSQL缓存详述
Windows平台编译 PostgreSQL
Ubuntu下LAPP（Linux+Apache+PostgreSQL+PHP)环境的配置与安装
Ubuntu上的phppgAdmin安装及配置
CentOS平台下安装PostgreSQL9.3
PostgreSQL配置Streaming Replication集群
------------------------------------华丽丽的分割线------------------------------------
PostgreSQL 的详细介绍：请点这里
PostgreSQL 的下载地址：请点这里
本文永久更新链接地址：
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