From: | Alban Hertroys <alban(at)magproductions(dot)nl> |
---|---|
To: | dmitry(at)koterov(dot)ru |
Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Postgres General <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: Planner tuning |
Date: | 2007-03-20 17:12:01 |
Message-ID: | 460015E1.2090309@magproductions.nl |
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Lists: | pgsql-general |
Dmitry Koterov wrote:
> I don't know exactly is it your case, but sometimes
>
> SET enable_sort = off;
>
> speeds up some queries by the factor of hundred. But in some cases this
> command slows down operations, so I TEMPORARILY switch enable_sort on and
> off for some queries. It affects the query plan greatly.
As you may have noticed, there's no sort in my query plan ;)
Seriously, I do not intend to use options like these in production
queries. They're not meant to be used like that.
It usually means you're trying to do something more complicated than
necessary - I achieved improved results by cleaning up my design,
removing hacks that appeared useful while we were still using PG 7.4.
--
Alban Hertroys
alban(at)magproductions(dot)nl
magproductions b.v.
T: ++31(0)534346874
F: ++31(0)534346876
M:
I: www.magproductions.nl
A: Postbus 416
7500 AK Enschede
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