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Re: Sort time

From: Stephan Szabo <sszabo(at)megazone23(dot)bigpanda(dot)com>
To: pginfo <pginfo(at)t1(dot)unisoftbg(dot)com>
Cc: "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Sort time
Date: 2002-11-17 17:29:50
Message-ID: 20021117092657.L38418-100000@megazone23.bigpanda.com (view raw or flat)
Thread:
Lists: pgsql-performance
On Sun, 17 Nov 2002, pginfo wrote:

> > On my not terribly powerful or memory filled box, I got a time of about
> > 16s after going through a couple iterations of raising sort_mem and
> > watching if it made temp files (which is probably a good idea to check as
> > well).  The data size ended up being in the vicinity of 100 meg in my
> > case.
>
> The time is very good!
> It is very good idea to watch the temp files.
> I started the sort_mem to 32 mb (it is 256 on the production system)
> and I see 3 temp files. The first is ~ 1.8 mb. The second is ~55 mb and the last is ~150
> mb.

As a note, the same data loaded into a non-"C" locale database took about
42 seconds on the same machine, approximately 2.5x as long.


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