Re: PITR and warm standby setup questions

I am on 8.2 production and it will be difficult to upgrade to 8.3. Is
it possible to backport the "%r" fix from 8.3 to 8.2?

Regards
Dhaval

On Nov 13, 2007 11:26 PM, Simon Riggs <simon(at)2ndquadrant(dot)com> wrote:
> On Tue, 2007-11-13 at 00:07 -0500, Greg Smith wrote:
> > On Mon, 12 Nov 2007, Mason Hale wrote:
> >
> > > After the wal segment file is copied by the restore_command script, is
> > > it safe to delete it from my archive?
> >
> > While I believe you can toss them immediately,
>
> This is almost never possible. The last WAL file that must be kept
> should be sufficient to allow recovery to restart from the last
> restartpoint. So a variable number of WAL files needs to be kept, not 1,
> not 2 and certainly never 0.
>
> pg_standby with 8.2 provides a -k option to allow keeping last N files,
> whereas 8.3 passes the %r parameter to show the filename of the last
> file that must be kept.
>
> > you should considering
> > keeping those around for a bit regardless as an additional layer of
> > disaster recovery resources. I try to avoid deleting them until a new
> > base backup is made, because if you have the last backup and all the
> > archived segments it gives you another potential way to rebuild the
> > database in case of a large disaster damages both the primary and the
> > secondary. You can never have too many ways to try and recover from such
> > a situation.
>
> Agreed
>
> --
> Simon Riggs
> 2ndQuadrant http://www.2ndQuadrant.com
>
>
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--
Dhaval Shah