Re: PITR Phase 2 - Design Planning

On Wed, 2004-04-28 at 05:00, Bruce Momjian wrote:
> Simon Riggs wrote:
> > On Tue, 2004-04-27 at 21:56, Rod Taylor wrote:
> > > > Overall, I'd refer back to the points Bruce raised - you certainly do
> > > > need a way of finding out the time to recover to, and as others have
> > > > said also, time isn't the only desirable "recovery point".
> > > 
> > > Wouldn't it be sufficient to simply use the transaction ID and ensure
> > > that all the parameters the user might want to use to find that ID can
> > > be made available in the log files?
> > > 
> > 
> > Yes, of course, all methods of locating a particular xlog file to stop
> > at are effectively equivalent. The discussion is mostly about what is
> > convenient for the user in a real recovery situation.
> > 
> > >From all that has been said so far, I would implement:
> > 
> > 1. Recovery to a specific txnid, which is fairly straightforward
> > 2. Recovery to a specific date/time 
> > a) either by implementing a log inspection tool that shows the txnid for
> > a PIT
> > b) implementing recovery to a PIT directly
> > 3. Recovery to a named checkpoint
> 
> What if we added transaction id to log_line_prefix?  The user could then
> log all queries and find the xid where they want to stop, but of course
> that assumes they have enabled such logging, and they have access to the
> logs.

Good thinking.

I'll have a look at this and come back to you.

Best Regards, Simon Riggs