| From: | Zeugswetter Andreas SB <ZeugswetterA(at)wien(dot)spardat(dot)at> |
|---|---|
| To: | "'Tim Perdue'" <tperdue(at)valinux(dot)com> |
| Cc: | "'pgsql-hackers(at)postgresql(dot)org'" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | AW: Some Improvement |
| Date: | 2000-07-13 07:11:30 |
| Message-ID: | 11C1E6749A55D411A9670001FA68796336800A@sdexcsrv1.f000.d0188.sd.spardat.at |
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| Lists: | pgsql-hackers |
> I still think there must be sorting going on, as the result
> is returned
> instantly if you remove the ORDER BY. I don't know - I do think it's
> much better now.
Are you doing the exact query I wrote for you ?
That is:
order by mail_list desc, mail_date desc
explain should tell you if it does a sort. There should not be a difference
with
or without the order by.
Hiroshi, I think you implemented the backwards index scan ?
Otherwise he would need to recreate the index as
(mail_list desc, mail_date desc)
Sorry for the inconvenience
Andreas
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