On Fri, 9 Nov 2007 12:08:57 -0600
"Campbell, Lance" <lance@uiuc.edu> wrote:
> How do you know when you should up the value of work_mem? Just play
> with the number. Is there a query I could do that would tell me if
> PostgreSql is performing SQL that could use more memory for sorting?
8.2 and older, it can be difficult to know, and I don't have a specific
recommendation.
8.3 includes a parameter to log the usage of temporary files by Postgres.
When a sort can't fit in the available memory, it uses a temp file, thus
you could use this new feature to track when sorts don't fit in
work_mem.
--
Bill Moran
Potential Technologies
http://www.potentialtech.com
