Re: I/O on select count(*)

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От Simon Riggs
Тема Re: I/O on select count(*)
Дата
Msg-id 1211921666.4489.261.camel@ebony.site
обсуждение исходный текст
Ответ на Re: I/O on select count(*)  (Tom Lane <tgl@sss.pgh.pa.us>)
Список pgsql-performance
On Mon, 2008-05-26 at 11:36 -0400, Tom Lane wrote:
> "Heikki Linnakangas" <heikki@enterprisedb.com> writes:
> > Decibel! wrote:
> >> Also, Simon and Tom had an idea at PGCon: Don't set hint-bits in the
> >> back-end if the page isn't already dirty.
>
> > Or even better: set the hint-bits, but don't dirty the page.
>
> Which in fact is what Simon suggested, not the other thing.

Just raised this on -hackers, BTW.

--
 Simon Riggs           www.2ndQuadrant.com
 PostgreSQL Training, Services and Support


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