| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | Heikki Linnakangas <heikki(at)enterprisedb(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Pavan Deolasee <pavan(dot)deolasee(at)gmail(dot)com>, Gregory Stark <stark(at)enterprisedb(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, PostgreSQL-patches <pgsql-patches(at)postgresql(dot)org> |
| Subject: | Re: HOT patch - version 15 |
| Date: | 2007-09-06 19:11:42 |
| Message-ID: | 20070906191142.GJ8709@alvh.no-ip.org |
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| Thread: | |
| Lists: | pgsql-patches |
Heikki Linnakangas escribió:
> Alvaro Herrera wrote:
> > Heikki Linnakangas escribió:
> >
> >> Hmm. I wonder if we could prune/defragment in bgwriter?
> >
> > That would be best, if at all possible. You can prune without accessing
> > anything outside the page itself, right?
>
> Yes, though you do need to have an oldest xmin to determine which tuples
> are dead,
Hmm, well, I think that with the VXID patch it might actually be
possible to get a Xmin without being in a transaction.
> and the removed tuples need to be WAL-logged.
Is this a problem for bgwriter?
--
Alvaro Herrera http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
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