Re: Performance Problem with Vacuum of bytea table (PG 8.0.13)

On Fri, May 25, 2007 at 10:29:30AM +0200, Bastian Voigt wrote:
> Hi *,
> for caching large autogenerated XML files, I have created a bytea table
> in my database so that the cached files can be used by multiple servers.
> There are about 500 rows and 10-20 Updates per minute on the table. The
> files stored in the bytea are anything from 10kB to 10MB. My PostgreSQL
> version is 8.0.13 on Gentoo Linux (x86) with PostGIS 1.2.0.
>
> For vacuum I use the pg_autovacuum daemon. It decided to vacuum my cache
> table about every 3 hours, the vacuum process takes 20-30 minutes
> (oops!) every time.

You'll want to decrease autovacum_vacuum_scale_factor to 0.2 if you're
on anything less than 8.2.
--
Jim Nasby decibel(at)decibel(dot)org
EnterpriseDB http://enterprisedb.com 512.569.9461 (cell)