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Re: Cluster/Replication

From: Mario Splivalo <mario(dot)splivalo(at)megafon(dot)hr>
To: cho <tobutaz(at)gmail(dot)com>
Cc: pgsql-admin(at)postgresql(dot)org
Subject: Re: Cluster/Replication
Date: 2007-10-22 09:44:25
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-admin
cho wrote:
> Le Fri, 19 Oct 2007 12:43:40 -0400, Sean Brown a écrit :
> Have a look at pgpool-I or pgpool-II in replication mode.
> Pgpool proxies SQL requests, so that requests on one server are replayed 
> on the other. pgpool-I is limited to two nodes, whereas pgpool-II is not. 
> Latency is important for write performance. You can do failover, you just 
> need to detect by yourself when one node is dead.
> There is also PITR recovery, but as it batches the transaction logs you 
> may lose a bit of data (up to a configured data size / duration).
PITR does not allow for the 'slave' server to be on-line, meaning you 
can't do SELECTs on the slave while shipping WALs.


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