From: | Filip Rembiałkowski <plk(dot)zuber(at)gmail(dot)com> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Szymon Guz <mabewlun(at)gmail(dot)com>, PostgreSQL <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: strange |
Date: | 2010-03-23 11:48:25 |
Message-ID: | 92869e661003230448s3a3a0cf7g22bb8751c841ed95@mail.gmail.com |
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Lists: | pgsql-general |
For the record, I've recently observed such behaviour on non-cheap
64bit server harware.
That was Pg 8.4.0. hardware specs available on request.
EXPLAIN ANALYZE SELECT was over 2 times slower that SELECT. repeatedly.
Answering an obligatory question: NO virtualization (vmware/xen/other) there.
Question:
Is there anything as normal, accepted level of performance degradation
when using EXPLAIN ANALYZE compared to plain query?
2010/3/22 Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>:
> Szymon Guz <mabewlun(at)gmail(dot)com> writes:
>> I've got a simple query. When I use explain analyze it lasts 7 times slower.
>> Why?
>
> You've got a machine where gettimeofday() is really slow. This is
> common on cheap PC hardware :-(
>
> regards, tom lane
>
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--
Filip Rembiałkowski
JID,mailto:filip(dot)rembialkowski(at)gmail(dot)com
http://filip.rembialkowski.net/
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