| From: | mark(at)mark(dot)mielke(dot)cc |
|---|---|
| To: | Luke Lonergan <llonergan(at)greenplum(dot)com> |
| Cc: | Bucky Jordan <bjordan(at)lumeta(dot)com>, "Spiegelberg, Greg" <gspiegelberg(at)cranel(dot)com>, Joshua Drake <jd(at)commandprompt(dot)com>, "Craig A(dot) James" <cjames(at)modgraph-usa(dot)com>, pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: Large tables (was: RAID 0 not as fast as expected) |
| Date: | 2006-09-19 03:45:47 |
| Message-ID: | 20060919034547.GA24692@mark.mielke.cc |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-performance |
On Mon, Sep 18, 2006 at 06:10:13PM -0700, Luke Lonergan wrote:
> Also be sure to set the random_page_cost parameter in
> postgresql.conf to 100 or even higher when you use indexes, as the actual
> seek rate for random access ranges between 50 and 300 for modern disk
> hardware. If this parameter is left at the default of 4, indexes will often
> be used inappropriately.
Does a tool exist yet to time this for a particular configuration?
Cheers,
mark
--
mark(at)mielke(dot)cc / markm(at)ncf(dot)ca / markm(at)nortel(dot)com __________________________
. . _ ._ . . .__ . . ._. .__ . . . .__ | Neighbourhood Coder
|\/| |_| |_| |/ |_ |\/| | |_ | |/ |_ |
| | | | | \ | \ |__ . | | .|. |__ |__ | \ |__ | Ottawa, Ontario, Canada
One ring to rule them all, one ring to find them, one ring to bring them all
and in the darkness bind them...
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Luke Lonergan | 2006-09-19 04:01:45 | Re: Large tables (was: RAID 0 not as fast as |
| Previous Message | Luke Lonergan | 2006-09-19 03:42:39 | Re: Large tables (was: RAID 0 not as fast as |