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Re: replay WAL segments without a "base backup" ?

From: Kevin Kempter <kevink(at)consistentstate(dot)com>
To: pgsql-admin(at)postgresql(dot)org
Subject: Re: replay WAL segments without a "base backup" ?
Date: 2009-08-11 17:14:07
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-admin
On Tuesday 11 August 2009 09:49:14 Tom Lane wrote:
> Kevin Kempter <kevink(at)consistentstate(dot)com> writes:
> > due to operator error at one of my client sites we're trying to restore a
> > deleted db.
> >
> > We did a restore with a pgdump that went fine but the dump is 3weeks old.
> > they do have WAL segments and they claim that the WAL segments are
> > exactly in line with the needed transactions - from a timing perspective.
> >  However no base backup with pg_start_backup() and pg_stop_backup() was
> > ever run.
> >
> > Is there any way to trick postgres into thinking that it needs to play
> > fwd these WAL's?  Would it work to simply place them in a dir, create a
> > recovery.conf file pointing to that dir and restart the cluster?
> No, there is exactly 0 hope here.  You would need a filesystem-level
> backup to work from.  A restore from a pg_dump is not going to reproduce
> any of the low-level details (such as OID assignments or tuple
> placement) that WAL replay needs to have match.
> 			regards, tom lane

What if we could do a pg_start_backup on the running cluster (the one that's 3 
weeks behind, tar up the file system, do a pg_stop_backup and walk thru the 
recovery steps?

Would there be a  way to force postgres to recognize the wal segments that 
werte created earlier (which according to the client include all tx from 3 
weeks ago thru today) ?

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Subject: Re: replay WAL segments without a "base backup" ?
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