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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: (view raw, whole thread or download thread mbox)
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
Kontakt:  Heynitz: 035242/47150,   D1: 0160/7141639 (mehr: -> Header)
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