| From: | Rod Taylor <rbt(at)rbt(dot)ca> |
|---|---|
| To: | Scott Marlowe <scott(dot)marlowe(at)ihs(dot)com> |
| Cc: | PostgreSQL Development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Very poor estimates from planner |
| Date: | 2003-11-05 23:46:47 |
| Message-ID: | 1068076006.53233.4.camel@jester |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
> I'm not sure if that will actually change the default_statistics_target of
> the tables you're analyzing, I think it will only apply to newly created
> tables.
>
> I believe you have to alter table alter column set statistics 1000 for
> each column you want a statistic of 1000. You might wanna try starting
> with 50 or 100 and see if that works first.
Hmm.. I was under the impression that it would work for any tables that
haven't otherwise been overridden.
Sets the default statistics target for table columns that have
not had a column-specific target set via ALTER TABLE SET
STATISTICS. Larger values increase the time needed to do
ANALYZE, but may improve the quality of the planner's estimates.
The default is 10.
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Tom Lane | 2003-11-05 23:57:04 | Re: Very poor estimates from planner |
| Previous Message | Tom Lane | 2003-11-05 23:25:20 | Re: Open Issues for 7.4 |