| From: | Decibel! <decibel(at)decibel(dot)org> |
|---|---|
| To: | Greg Smith <gsmith(at)gregsmith(dot)com> |
| Cc: | PFC <lists(at)peufeu(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Per-table random_page_cost for tables that we know are always cached |
| Date: | 2008-04-24 16:07:49 |
| Message-ID: | 3FA47641-ABEA-4C6E-87D4-8EF3CAFC114F@decibel.org |
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| Thread: | |
| Lists: | pgsql-hackers |
On Apr 23, 2008, at 12:31 AM, Greg Smith wrote:
> Jim threw out that you can just look at the page hit percentages
> instead. That's not completely true. If you've had some nasty
> query blow out your buffer cache, or if the server has been up a
> looong time and the total stas don't really reflect recent reality,
> what's in the buffer cache and what the stats say have been
> historical cached can diverge.
Yeah, I kinda hand-waved over that. Obviously we'd want to look at
recent stats, not beginning of time.
--
Decibel!, aka Jim C. Nasby, Database Architect decibel(at)decibel(dot)org
Give your computer some brain candy! www.distributed.net Team #1828
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