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Re: explain analyze query execution time

From: Jeff Janes <jeff(dot)janes(at)gmail(dot)com>
To: Rudyar <rudyar(dot)cortes(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: explain analyze query execution time
Date: 2011-11-22 04:20:18
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Lists: pgsql-hackers
On 11/21/11, Rudyar <rudyar(dot)cortes(at)gmail(dot)com> wrote:
> Hello,
> I try to get the execution time of a query workload. I try using explain
> analyze but this time is allways higher than
> the execution time of a query across a client like pgadmin3
> what is the reason about that difference?

Analyze has to do a lot of gettimeofday calls and other bookkeeping,
and that takes time.  If the data queried is all in memory, this
analyze overhead can be far more than the query itself.


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