From: | Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> |
---|---|
To: | Simon Riggs <simon(at)2ndquadrant(dot)com> |
Cc: | Christopher Browne <cbbrowne(at)acm(dot)org>, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: Autovacuum and OldestXmin |
Date: | 2007-11-26 12:23:10 |
Message-ID: | 20071126122310.GD6248@alvh.no-ip.org |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-hackers |
Simon Riggs wrote:
> On Thu, 2007-11-22 at 21:59 -0500, Christopher Browne wrote:
> > I imagine it might be useful to add it to autovac, too. I thought it
> > was pretty neat that this could be successfully handled by comparison
> > with a single value (e.g. - eldest xmin), and I expect that using a
> > single quasi-global value should be good enough for autovac.
>
> I've just looked at that to see if it is that easy; I don't think it is.
>
> That works for slony currently because we vacuum all of the slony tables
> at once. Autovacuum does individual tables so we'd need to store the
> individual values otherwise we might skip doing a VACUUM when it could
> have done some useful work.
Yeah, that was my conclusion too.
--
Alvaro Herrera http://www.amazon.com/gp/registry/5ZYLFMCVHXC
Voy a acabar con todos los humanos / con los humanos yo acabaré
voy a acabar con todos / con todos los humanos acabaré (Bender)
From | Date | Subject | |
---|---|---|---|
Next Message | mac_man2005 | 2007-11-26 12:30:28 | Replacement Selection |
Previous Message | Guillaume Smet | 2007-11-26 11:12:38 | Re: 8.3devel slower than 8.2 under read-only load |