Re: Yet another slow nested loop

On Tue, Jun 16, 2009 at 3:56 PM, Dave Dutcher<dave(at)tridecap(dot)com> wrote:
>> -----Original Message-----
>> From: Alexander Staubo
>>
>>    ->  Nested Loop  (cost=0.00..5729774.95 rows=10420 width=116)
>> (actual time=262614.470..262614.470 rows=0 loops=1)
>>          Join Filter: ((photos.taken_at > (event_instances."time" +
>> '-01:00:00'::interval)) AND (photos.taken_at < (event_instances."time"
>> + '07:00:00'::interval)))
>>          ->  Nested Loop  (cost=0.00..2055574.35 rows=11869630
>> width=120) (actual time=21.750..121838.012 rows=14013998 loops=1)
>
>
> Do you have any of the other enable_* options set to false?

No.

> What do you
> have random_page_cost set to?  I ask because I'm surprised to see postgres
> choose to loop when it knows it will have to loop 11 million times.

The default, ie. 4.0.

A.