Re: Slow SELECT on three or more clients - Mailing list pgsql-performance

From AMIR FRANCO D. JOVEN
Subject Re: Slow SELECT on three or more clients
Date
Msg-id e38bba340611160047u27643e09wc982da68f4bedfe@mail.gmail.com
Whole thread Raw
In response to Re: Slow SELECT on three or more clients  (Markus Schaber <schabi@logix-tt.com>)
List pgsql-performance
Hi Markus,

Thank you very much for the information.

I was able to make it fast by correcting indices, i created index on frequently filtered fields.
now it runs at 0.05 seconds average, much faster than before 0.86.

I will also upgrade to 8.1.5.

Once again, thank you very much. it helped me a lot.

Amir

On 11/15/06, Markus Schaber <schabi@logix-tt.com> wrote:
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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--
AMIR FRANCO D. JOVEN
Software Engineer
DIGI Software (PHILS.) Inc.

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