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Re: Big SGA.......

From: Jonathan Lewis <jonathan_at_jlcomp.demon.co.uk>
Date: Tue, 04 Mar 2003 09:19:51 -0800
Message-ID: <F001.0055FAEE.20030304091951@fatcity.com>

A late-breaking thought - but it's not my area of expertise, so others may laugh.

If you have a very large SGA, don't you end up with a very large 'page table' at the O/S level to map virtual memory to real memory. And if you do, doesn't this affect the speed and cost of a context switch. If so, you may waste a lot of resources task-switching rather than working - especially if you system is designed to do a very large number of very small queries.

Any comments from Unix hot-shots ?

Regards

Jonathan Lewis
http://www.jlcomp.demon.co.uk

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Author: Jonathan Lewis
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Received on Tue Mar 04 2003 - 11:19:51 CST

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