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Re: How long will the query take

From: "A(dot) Kretschmer" <andreas(dot)kretschmer(at)schollglas(dot)com>
To: pgsql-general(at)postgresql(dot)org
Subject: Re: How long will the query take
Date: 2010-03-29 16:08:07
Message-ID: 20100329160807.GA4861@a-kretschmer.de (view raw or flat)
Thread:
Lists: pgsql-general
In response to John Gage :
> I ran a query out of pgAdmin, and (as I expected) it took a long  
> time.  In fact, I did not let it finish.  I stopped it after a little  
> over an hour.
> 
> I'm using 8.4.2 on a Mac with a 2.4GHz processor and 2GB of RAM.
> 
> My question is: is there a way to tell how close the query is to being  
> finished.  It would be a great pity if the query would have finished  
> in the 10 seconds after I quit it, but I had no way of telling.
> 
> As a postscript, I would add that the query was undoubtedly too  
> ambitious.  I have a reduced set version which I will run shortly.   
> But I am still curious to know if there is a way to tell how much time  
> is left.

No, not really. But you can (and should) run EXPLAIN <your query> to
obtain the execution plan for that query, und you can show us this plan
(and the table-definition for all included tables). Maybe someone is able
to tell you what you can do to speed up your query.

And yes, have you tuned your postgresql.conf?


Regards, Andreas
-- 
Andreas Kretschmer
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