| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Simon Riggs <simon(at)2ndquadrant(dot)com>, "Florian G(dot) Pflug" <fgp(at)phlo(dot)org>, Postgresql-Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Advice on MyXactMade* flags, MyLastRecPtr, pendingDeletes and lazy XID assignment |
| Date: | 2007-08-31 01:19:01 |
| Message-ID: | 20070831011901.GF5872@alvh.no-ip.org |
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| Thread: | |
| Lists: | pgsql-hackers |
Tom Lane wrote:
> Simon Riggs <simon(at)2ndquadrant(dot)com> writes:
> > -1 to second: If there are any temporary deleted files then it is
> > because we've done a large sort, hash join etc, so avoiding the sync
> > makes no difference to the overall response time.
>
> I think you're confused, actually: this is not about temporary sort
> files, it's about dropping temp relations. The scenario for this to
> happen in ABORT is a rollback of a transaction that made a temp table.
Why don't we create temp tables in a separate directory, anyway? That
would make it trivially easy to get rid of them during recovery: just
zap all the files in there.
--
Alvaro Herrera http://www.flickr.com/photos/alvherre/
Essentially, you're proposing Kevlar shoes as a solution for the problem
that you want to walk around carrying a loaded gun aimed at your foot.
(Tom Lane)
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