> > Solaris is unknown to me. Maybe the used random number generator there
> > isn't good enough?
>
> Hmmm. Good point. Will have to test on Linux.
Nope:
Linux 2.4.20:
test=# select tablename, attname, n_distinct from pg_stats where tablename =
'web_site_activity_fa';
tablename | attname | n_distinct
----------------------+---------------------+------------
web_site_activity_fa | session_id | 626127
test=# select count(distinct session_id) from web_site_activity_fa;
count
---------
3174813
(1 row)
... I think the problem is in our heuristic sampling code. I'm not the first
person to have this kind of a problem. Will be following up with tests ...
--
--Josh
Josh Berkus
Aglio Database Solutions
San Francisco
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