| From: | Simon Riggs <simon(at)2ndquadrant(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Heikki Linnakangas <heikki(at)enterprisedb(dot)com>, Decibel! <decibel(at)decibel(dot)org>, Greg Smith <gsmith(at)gregsmith(dot)com>, pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: I/O on select count(*) |
| Date: | 2008-05-27 20:54:26 |
| Message-ID: | 1211921666.4489.261.camel@ebony.site |
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| Thread: | |
| Lists: | pgsql-performance |
On Mon, 2008-05-26 at 11:36 -0400, Tom Lane wrote:
> "Heikki Linnakangas" <heikki(at)enterprisedb(dot)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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