From: | "hubert depesz lubaczewski" <depesz(at)gmail(dot)com> |
---|---|
To: | "Alban Hertroys" <alban(at)magproductions(dot)nl> |
Cc: | "Postgres General" <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: A slow query - Help please? |
Date: | 2006-06-17 10:12:38 |
Message-ID: | 9e4684ce0606170312g5a1107bah9c51ca8969d01cb@mail.gmail.com |
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Lists: | pgsql-general |
On 6/16/06, Alban Hertroys <alban(at)magproductions(dot)nl> wrote:
>
> We really need this solved. Isn't anybody able to shed some light on
> this? Is it possible to make this query use an index scan, preferably
> w/o disabling sequential scanning?
>
ditch the inheritance. it is no good, and makes everything too complicated
to work with.
in case you can't, do something similar to this:
select * from
(
select * from only table_a order by number desc limit 25
union
select * from only table_b order by number desc limit 25
union
select * from only table_c order by number desc limit 25
) x
order by number desc limit 25;
it should be faster. and yes, i know it's ugly.
depesz
--
http://www.depesz.com/ - nowy, lepszy depesz
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