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Re: Open items

From: Stephen Frost <sfrost(at)snowman(dot)net>
To: Rod Taylor <pg(at)rbt(dot)ca>
Cc: Satoshi Nagayasu <nagayasus(at)nttdata(dot)co(dot)jp>,PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>,Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>, josh(at)agliodbs(dot)com,Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Subject: Re: Open items
Date: 2005-06-30 14:47:21
Message-ID: 20050630144721.GE24207@ns.snowman.net (view raw or flat)
Thread:
Lists: pgsql-hackerspgsql-patches
* Rod Taylor (pg(at)rbt(dot)ca) wrote:
> On Thu, 2005-06-30 at 23:02 +0900, Satoshi Nagayasu wrote:
> > > The TODO item is about counting all temporary files, not sorts in
> > > particular.  Or at least that's what I thought it meant.
> > 
> > If the DBA have to improve the performance,
> > DBA will need to know about:
> > 
> >   - Which SQL generate a disk sort?
> 
> Good point. An EXPLAIN ANALYZE note about the disk usage for the sort
> would be really nice.

I agree with this.  It'd also be really nice to know when a sort is
going to be done on the disk vs. when the planner thinks there's enough
memory to do it in memory (or does that always turn it into a hash join
from a merge join?).

	Thanks,

		Stephen

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