| From: | "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com> |
|---|---|
| To: | Mark Kirkwood <markir(at)coretech(dot)co(dot)nz> |
| Cc: | Rod Taylor <pg(at)rbt(dot)ca>, Christopher Kings-Lynne <chriskl(at)familyhealth(dot)com(dot)au>, ken <southerland(at)samsixedd(dot)com>, Postgresql Performance <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: Index oddity |
| Date: | 2004-06-10 03:32:10 |
| Message-ID: | 40C7D63A.7050707@commandprompt.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-performance |
>>
> ANALYZE might be producing poor stats due to :
>
> i) many dead tuples or
> ii) high proportion of dead tuples in the first few pages of the table
>
> Does a VACUUM FULL followed by ANALYZE change the estimates (or have
> you tried this already)?
>
> (p.s. - I probably don't qualify for the 'more knowledge' bit either...)
You can also increase your statistics_target which will make ANALYZE
take longer but can help a great deal
with larger data sets.
Sincerely,
Joshua D. Drake
>
> regards
>
> Mark
>
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