Drop statistics?

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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.

It's possible that the existing stats were just not optimal, and i won't be able to get that back.

But I just want to verify that what i've done is the only real option that I have? am i missing anything
else that I could try?

(I'm on PG9.1)

Thanks.

Dave

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