Re: 57 minute SELECT

Thanks, David.

Can't run EXPLAIN (ANALYZE, BUFFERS) as I'm on 8.4.


-----Original Message-----
From: pgsql-performance-owner@postgresql.org [mailto:pgsql-performance-owner@postgresql.org] On Behalf Of David
Johnston
Sent: Thursday, 3 October 2013 11:19 AM
To: pgsql-performance@postgresql.org
Subject: Re: [PERFORM] 57 minute SELECT

Samuel Stearns-2 wrote
> EXPLAIN:
>
> QUERY PLAN
> ----------------------------------------------------------------------
> ----------------------------------------------------------------------
> ----------------------------------------------------------------------
> -  Hash Join  (cost=408.53..1962721.39 rows=98068 width=126) (actual
> time=30121.265..3419306.752 rows=1929714 loops=1)

You are selecting and returning 2 million records...how fast do you want this to run?  For some reason I read 57
secondsinitially - I guess 57 minutes is a bit much...but the most obvious solution is RAM. 

Might want to include buffers output in the explain as well but:

I'm doubting the contents of your result fit into the server memory so your disk is involved which will severely slow
downprocessing. 

Hopefully someone more knowledgeable and experience will chime in to help you.

David J.




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