Re: How to improve db performance with $7K?

On Mon, Apr 18, 2005 at 06:41:37PM -0000, Mohan, Ross wrote:
> Don't you think "optimal stripe width" would be
> a good question to research the binaries for? I'd
> think that drives the answer, largely.  (uh oh, pun alert)
>
> EG, oracle issues IO requests (this may have changed _just_
> recently) in 64KB chunks, regardless of what you ask for.
> So when I did my striping (many moons ago, when the Earth
> was young...) I did it in 128KB widths, and set the oracle
> "multiblock read count" according. For oracle, any stripe size
> under 64KB=stupid, anything much over 128K/258K=wasteful.
>
> I am eager to find out how PG handles all this.

AFAIK PostgreSQL requests data one database page at a time (normally
8k). Of course the OS might do something different.
--
Jim C. Nasby, Database Consultant               decibel@decibel.org
Give your computer some brain candy! www.distributed.net Team #1828

Windows: "Where do you want to go today?"
Linux: "Where do you want to go tomorrow?"
FreeBSD: "Are you guys coming, or what?"