John,
I'm doing VACUUM ANALYZE once a night. Before the tests I did VACUUM and
then ANALYZE.
Dirk
John A Meinel wrote:
> Dirk Lutzebaeck wrote:
>
>> Greg,
>>
>> Thanks for your analysis. But I dont get any better after bumping
>> STATISTICS target from 10 to 200.
>> explain analyze shows that the optimizer is still way off estimating
>> the rows. Is this normal? It still produces a 1 GB temp file.
>> I simplified the query a bit, now only two tables are involved (bi,
>> df). I also vacuumed.
>
>
>
> Are you just doing VACUUM? Or are you doing VACUUM ANALYZE? You might
> also try VACUUM ANALYZE FULL (in the case that you have too many dead
> tuples in the table).
>
> VACUUM cleans up, but doesn't adjust any planner statistics without
> ANALYZE.
>
> John
> =:->
>