From: Markus Schaber <schabi@logix-tt.com>
To: AMIR FRANCO D. JOVEN <amir@digi.ph>
Cc: pgsql-performance@postgresql.org
Subject: Re: Slow SELECT on three or more clients
Date: Wed, 15 Nov 2006 15:47:04 +0100
Message-ID: <455B2868.7010303@logix-tt.com> (raw)
In-Reply-To: <e38bba340611150337r1c9a895nd99d95ca8408b88c@mail.gmail.com>
References: <e38bba340611150337r1c9a895nd99d95ca8408b88c@mail.gmail.com>
Hi, Amir,
AMIR FRANCO D. JOVEN wrote:
> My current project uses PostgreSQL 7.3.4.
By all means, please upgrade.
The newest 7.3 series version is 7.3.16, which fixes lots of critical
bugs, and can be used as a drop-in replacement for 7.3.4 (see Release
Notes at http://www.postgresql.org/docs/7.3/interactive/release.html )
The newest stable release is 8.1.5, and 8.2 is just on the roads...
> I have a table with 94 fields and a select with only one resultset in
> only one client consumes about 0.86 seconds.
"with only on resultset"?
You mean "with only one returned row", I presume.
Each SELECT has exactly one resultset, which can contain zero to many rows.
Please check the following:
- Did you create the appropriate indices?
- Version 7.3.X may suffer from index bloat, so REINDEX might help.
- Did you VACUUM and ANALYZE the table properly?
- Is your free space map setting, the statistics targets, and other
config options tuned to fit your environment?
- Maybe a VACUUM FULL or a CLUSTER command may help you.
> for a single select with one field in one resultset, is 0.86 seconds normal?
That depends on the circumstances.
Markus
--
Markus Schaber | Logical Tracking&Tracing International AG
Dipl. Inf. | Software Development GIS
Fight against software patents in Europe! www.ffii.org
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To: pgsql-performance@postgresql.org
Cc: schabi@logix-tt.com, amir@digi.ph
Subject: Re: Slow SELECT on three or more clients
In-Reply-To: <455B2868.7010303@logix-tt.com>
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