On Sat, Oct 01, 2005 at 02:00:12PM -0400, Tom Lane wrote:
> I wrote:
> > It's presumably mostly in the pg_table_is_visible() calls.
>
> I did some profiling on a test case with 10000 tables, and noticed that
> a big part of the problem is that the catalog caches become entirely
> useless: almost every catcache lookup ends up going to the underlying
> tables. This is because MAXCCTUPLES in catcache.c is fixed at 5000,
> and that's not an adequate working set for this many tables. If you
> are willing to throw memory at the problem, you could try increasing
> MAXCCTUPLES (to say 50K or 100K) and see if that helps.
Out of curiosity... does catcache cache all pg_* tables? Also, at what
point would it be good to up NCCBUCKETS?
--
Jim C. Nasby, Sr. Engineering Consultant jnasby@pervasive.com
Pervasive Software http://pervasive.com work: 512-231-6117
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