Re: [Solved] Postgres performance problem

[Richard Huxton <dev(at)archonet(dot)com>]

Decibel! wrote:
> On Thu, Aug 30, 2007 at 11:50:04AM +0200, Ruben Rubio wrote:
> > As you may know, I do a vacuum full and a reindex database each day. I
> > have logs that confirm that its done and I can check that everything was
> >  fine.
> >
> > So, this morning, I stopped the website, I stopped database, started it
> > again. (I was around 200  days without restarting), then I vacuum
> > database and reindex it (Same command as everyday) . Restart again, and
> > run again the website.
> >
> > Now seems its working fine. But I really does not know where is the
> > problem. Seems vacuum its not working fine?  Maybe database should need
> > a restart? I really don't know.
>
> No, it sounds to me like you just weren't vacuuming aggressively enough
> to keep up with demand.

Actually , I think it sounds like a stray long-lived transaction.

Ruben - vacuum can't recover rows if another transaction might be able 
to see them. So, if you have a connection that issues BEGIN and sits 
there for 200 days you can end up with a lot of bloat in your database.

Now, there's no way to prove that since you've restarted the 
database-server, but keep an eye on it.

--
  Richard Huxton
  Archonet Ltd