Re: \d on database with a lot of tables is slow

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
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