Re: Big SGA.......

Now you mention it, I have seen some other operating system use a reference to 'large' (4MB) pages.

I have heard some comments, though, about one of the Solaris versions not being able to use shared page tables (ISM) when the SGA goes over a critical limit - but this could be highly version-dependent, relate to some inability to use large pages with ISM, or half a dozen other things.

Regards

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

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The Co-operative Oracle Users' FAQ
http://www.jlcomp.demon.co.uk/faq/ind_faq.html

• Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: 06 March 2003 06:33

> Linux has two patches to deal with that. One is the "highpte" patch
which
> allows page table entries in "high memory" (i.e. after 1Gb). The
other is
> "bigpages" which allows larger pages (i.e. 4mb instead of 4kb), thus
fewer
> page table entries. Both patches are for Red Hat AS 2.1. I imagine
that
> the proprietary UNIXes dealt with this a *long* time ago. Oracle
and other
> long-time UNIX ISVs are pretty much having to lead the Linux vendors
by the
> hand on such things...
>

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Author: Jonathan Lewis
  INET: jonathan_at_jlcomp.demon.co.uk

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