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Re: 100% failover + replication solution

From: "Shoaib Mir" <shoaibmir(at)gmail(dot)com>
To: "Moiz Kothari" <moizpostgres(at)gmail(dot)com>
Cc: "Ben Suffolk" <ben(at)vanilla(dot)net>, pgsql-admin(at)postgresql(dot)org
Subject: Re: 100% failover + replication solution
Date: 2006-10-30 12:49:04
Message-ID: bf54be870610300449uc1aa708mf4cecb7c3fe16ecc@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-admin
Hi Moiz,

If I had to choose for your case where you want to direct your selects to
slave node and inserts/updates on master, I would have opted for Slony or
PGCluster.

Using PITR for HA can be a good option if you want to switch between primary
and secondary server, where you can store the archive files on a shared disk
and place a recovery file with in $PGDATA and automate the process where it
can run the process of recovery on each primary and seconday like for
example 5 times a day as it all depends on the number of transactions
happening on the db server. I have seen a few users doing this for routine
VACUUM FULL process as a maintanence activity.

Thanks,
---------
Shoaib Mir
EnterpriseDB (www.enterprisedb.com)

On 10/30/06, Moiz Kothari <moizpostgres(at)gmail(dot)com> wrote:
>
> Shoaib,
>
> It sure does, i saw PGCLUSTER, but 3 reasons for having a postgres
> specific solution.
>
> 1) If pgcluster stops further development, it would be lot more hassel
> when upgrading to a different version of postgres.
> 2) Postgres specific solution would help alot going ahead in future.
> 3) Also architecture of pgcluster might make things slower as it updates
> complete cluster before confirming the request.
>
> There are lots of them available in market, but i think WAL solution
> should be available, if not then the thought process should be there going
> ahead. I am expecting a solution out of WAL logs. Let me know if you have
> any thoughts about it.
>
> Regards,
> Moiz Kothari
>
> On 10/30/06, Shoaib Mir <shoaibmir(at)gmail(dot)com> wrote:
> >
> > There is this project which actually is not released yet, but something
> > that you want to achieve :)
> >
> > http://pgfoundry.org/projects/pgpitrha
> >
> > Regards,
> > -------
> > Shoaib Mir
> > EnterpriseDB (www.enterprisedb.com)
> >
> > On 10/30/06, Ben Suffolk < ben(at)vanilla(dot)net> wrote:
> >
> > > > Guys,
> > > >
> > > > I have been thinking about this and wanted to see if it can be
> > > > achived. I wanted to make a 100% failover solution for my postgres
> > > > databases. The first thing that comes to my mind is doing it using
> > > > WAL logs. Am attaching the diagram for which i will write more here.
> > >
> > >
> > > While its not the solution you were looking at, have you seen
> > > PGCluser :-
> > >
> > > http://pgcluster.projects.postgresql.org/index.html
> > >
> > > I have not tried it, but was looking the other week at various fail-
> > > over type solutions and came across it. It seems to be able to do
> > > what you want.
> > >
> > > Ben
> > >
> > >
> > >
> > >
> > >
> > >
> > > ---------------------------(end of
> > > broadcast)---------------------------
> > > TIP 9: In versions below 8.0, the planner will ignore your desire to
> > >        choose an index scan if your joining column's datatypes do not
> > >        match
> > >
> >
> >
>

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Next:From: Moiz KothariDate: 2006-10-30 13:11:54
Subject: Re: 100% failover + replication solution
Previous:From: Richard Broersma JrDate: 2006-10-30 12:41:17
Subject: Re: [ADMIN] Copying data from table to table (cloned tables)

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