On Sat, 6 Oct 2007, Tom Lane wrote:
> "Jeff Frost" <jeff@frostconsultingllc.com> writes:
>> Before analyze it seems to choose Bitmap Heap Scan on episodes
>> current_episode, but after it chooses Index Scan Backward using
>> index_episodes_on_publish_on on episodes current_episode.
>
> Have you tried raising the stats target for "episodes"? Seems like
> the problem is a misestimate of the frequency of matches for
> season_id = something.
Can you set the stats target for an entire table up?
I tried this:
ALTER TABLE episodes ALTER COLUMN season_id SET STATISTICS 1000;
and got the same plan.
And since I had this on a test server, I set the default stats target
up to 100, reran analyze and got the same plan.
Same if I up it to 1000. :-(
--
Jeff Frost, Owner <jeff@frostconsultingllc.com>
Frost Consulting, LLC http://www.frostconsultingllc.com/
Phone: 650-780-7908 FAX: 650-649-1954
