Re: A slow query - Help please?
| От | hubert depesz lubaczewski |
|---|---|
| Тема | Re: A slow query - Help please? |
| Дата | |
| Msg-id | 9e4684ce0606170312g5a1107bah9c51ca8969d01cb@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: A slow query - Help please? (Alban Hertroys <alban@magproductions.nl>) |
| Ответы |
Re: A slow query - Help please?
Re: A slow query - Help please? |
| Список | pgsql-general |
On 6/16/06, Alban Hertroys <alban@magproductions.nl> wrote:
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
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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