David Kerr <dmk@mr-paradox.net> writes:
> I'm trying to work through a root cause on a performance problem. I'd like to
> be able to "show" that a problem was fixed by analyzing the table.
> what i've done is
> set default_statistics_target=1
> analyze <Table>
> That gets rid of most of the rows in pg_stats, but i'm still getting decent performance.
I usually do something like
DELETE FROM pg_statistic WHERE starelid = 'foo'::regclass;
(you need to be superuser to be allowed to do this).
You may need to keep an eye on whether auto-analyze is coming along and
undoing what you did, too.
regards, tom lane