Обсуждение: Performance Issues in 7.4.3

My previous post about slow updates w/ 7.4.2 needed a multi-column index to get speed comparable to Sybase.  When I
wentto 7.4.3 (Slackware 9.1) w/ JDBC, the improvements are that it doesn't initially take much memory (have 512M) and
didn'tswap.  I ran a full vaccum and a cluster, however speed degaded to 1 *second* / update of one row in 150 rows of
data,within a day!  pg_autovacuum now gives excellent performance.  What happened? 




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On Wed, 30 Jun 2004, Jim Ewert wrote:

>
> My previous post about slow updates w/ 7.4.2 needed a multi-column index
> to get speed comparable to Sybase.  When I went to 7.4.3 (Slackware 9.1)
> w/ JDBC, the improvements are that it doesn't initially take much memory
> (have 512M) and didn't swap.  I ran a full vaccum and a cluster, however
> speed degaded to 1 *second* / update of one row in 150 rows of data,
> within a day!  pg_autovacuum now gives excellent performance.  What
> happened?
>

This is not a jdbc question and is probably more appropriate for the
-general list.

http://www.postgresql.org/docs/7.4/static/maintenance.html#VACUUM-FOR-SPACE-RECOVERY

Kris Jurka

Hi,

On Wed, 30 Jun 2004 12:30:07 -0500 (EST)
Kris Jurka <books@ejurka.com> wrote:

> > My previous post about slow updates w/ 7.4.2 needed a multi-column
> > index to get speed comparable to Sybase.  When I went to 7.4.3
> > (Slackware 9.1) w/ JDBC, the improvements are that it doesn't
> > initially take much memory(have 512M) and didn't swap.  I ran a full
> > vaccum and a cluster, however speed degaded to 1 *second* / update
> > of one row in 150 rows of data, within a day!  pg_autovacuum now
> > gives excellent performance.  What happened?
>
> This is not a jdbc question and is probably more appropriate for the
> -general list.

There also is a pgsql-performance@postgresql.org mailing list
specifically for performance questions.

HTH,
Markus


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