what I did, was an ANALYZE, which did not change anything. 

I just executed a VACUUM ANALYZE and now everything performs well. hm, strange.

thanks
Dieter



Am 12.04.2011 um 09:42 schrieb Claudio Freire:

On Tue, Apr 12, 2011 at 7:20 AM, Dieter Rehbein
<dieter.rehb...@skiline.cc> wrote:
> Hi everybody,
> 
> I have a performance-problem with a query using a LIMIT. There are other 
> threads rergading performance issues with LIMIT, but I didn't find useful 
> hints for our problem and it might
> be interesting for other postgres-users.

Did you perform an ANALYZE or VACUUM ANALYZE?
Did you try increasing the statistic targets?

AFAIK, it looks a lot like the planner is missing stats, since it
estimates the index query on idx_nfi_newsfeed will fetch 10k rows -
instead of 25.


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