Re: Replication

Which replication problem are you trying to solve?

On Thu, 14 Jun 2007, Craig James wrote:

> Looking for replication solutions, I find:
>
> Slony-I
> Seems good, single master only, master is a single point of failure,
> no good failover system for electing a new master or having a failed
> master rejoin the cluster.  Slave databases are mostly for safety or
> for parallelizing queries for performance.  Suffers from O(N^2) 
> communications (N = cluster size).
>
> Slony-II
> Seems brilliant, a solid theoretical foundation, at the forefront of
> computer science.  But can't find project status -- when will it be
> available?  Is it a pipe dream, or a nearly-ready reality?
>
> PGReplication
> Appears to be a page that someone forgot to erase from the old GBorg site.
>
> PGCluster
> Seems pretty good, but web site is not current, there are releases in use
> that are not on the web site, and also seems to always be a couple steps
> behind the current release of Postgres.  Two single-points failure spots,
> load balancer and the data replicator.
>
> Is this a good summary of the status of replication?  Have I missed any 
> important solutions or mischaracterized anything?
>
> Thanks!
> Craig
>
>
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