Tom,
> Partly. The numbers suggest that in ANALYZE's default sample of 3000
> rows, it's only finding about a dozen non-null tgroup_ids (yielding the
> 0.996 null_frac value); and that in one case all dozen are different and
> in the other case there are two duplicates. It would help if you
> boosted the stats target for this column by a factor of 10. (You can
> do that in 7.2, btw --- IIRC the only problem is that a pg_dump won't
> show that you did so.)
Also, there doesn't seem to be any way in 7.2 for me to find out what the
current statistics target for a column is. What am I missing?
--
-Josh Berkus
Aglio Database Solutions
San Francisco