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Re: Slow SQL query (14-15 seconds)

From: Matthew Wakeling <matthew(at)flymine(dot)org>
To: pgsql-performance(at)postgresql(dot)org
Subject: Re: Slow SQL query (14-15 seconds)
Date: 2008-11-13 13:28:13
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
On Thu, 13 Nov 2008, Bruno Baguette wrote:
> I'm having a problem with this query (below) that takes between 14 and 15 
> seconds to run, which is too long for the end-user.
> I've done a EXPLAIN ANALYZE (below below) but I'm having difficulties to see 
> which part of that query is taking so many times.

As a general tip, if you're trying to work out which part of a query is 
taking time, and the query is fairly obviously made up of several parts, 
it would make sense to try them individually.

In any case, it appears that the time is being taken performing a full 
index scan over the societe table, in one of the subqueries. Perhaps you 
could run each of the subqueries individually, and send us the one that 
takes loads of time as a simpler problem to solve.


Those who do not understand Unix are condemned to reinvent it, poorly.
                -- Henry Spencer

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Subject: Re: Slow SQL query (14-15 seconds)
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