| From: | Simon Riggs <simon(at)2ndquadrant(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | "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: | 2007-08-30 21:01:25 |
| Message-ID: | 1188507685.4173.11.camel@ebony.site |
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| Thread: | |
| Lists: | pgsql-hackers |
On Thu, 2007-08-30 at 00:33 -0400, Tom Lane wrote:
> "Florian G. Pflug" <fgp(at)phlo(dot)org> writes:
> > And I'm quite tempted to not flush the XLOG at all during ABORT, and to
> > only force synchronous commits if one of the to-be-deleted files is
> > non-temporary.
>
> +1 on the first, but -1 on the second, because we'd have to track
> whether deleted files are temp or not ... it's very unclear that it'd
> be worth the trouble.
+1 to first: Aborts aren't particularly frequent actions, but having
them return faster makes sense if you have a session pool and people are
waiting to run another transaction.
-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.
--
Simon Riggs
2ndQuadrant http://www.2ndQuadrant.com
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