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@sss.pgh.pa.us>:
> Szymon Guz <mabewlun@gmail.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
>
> --
> Sent via pgsql-general mailing list (pgsql-general@postgresql.org)
> To make changes to your subscription:
> http://www.postgresql.org/mailpref/pgsql-general
>
--
Filip Rembiałkowski
JID,mailto:filip.rembialkowski@gmail.com
http://filip.rembialkowski.net/
