RE: query slow in 9i, but not slow in 8i

From: Niall Litchfield <n-litchfield_at_audit-commission.gov.uk>
Date: Tue, 02 Mar 2004 12:44:01 +0000
Message-Id: <s04481a7.009@bristol21.bristol.ac>

I had a discussion a while back about the way the use of dbca rather changes the meaning of 'default'. I *think* that this was in relation to wether the default for 9i was to create a locally managed system tablespace or a dictionary mangled one. Dbca has had a habit of setting parameters/options that arguably should be set but in a rather silent manner.

Cheers

Niall Litchfield
Oracle DBA
Audit Commission
+44 117 975 7805

> -----Original Message-----
> From: jonathan_at_jlcomp.demon.co.uk
> Sent: 02 March 2004 12:22
> To: jonathan_at_jlcomp.demon.co.uk; oracle-l_at_freelists.org
> Subject: Re: query slow in 9i, but not slow in 8i
>
>
>
>
> I should have checked before posting.
>
> pga_aggregate_target defaults to zero,
> and the instance won't start if you set
> it to zero when workarea_size_policy
> is set to AUTO.
>
> It's DBCA that sets the pga_aggregate_target
> to 25M for you if you don't interfere. (Giving
> you a whole new meaning for 'default install')
>
> Regards
>
> Jonathan Lewis
> http://www.jlcomp.demon.co.uk
>
> The Co-operative Oracle Users' FAQ
> http://www.jlcomp.demon.co.uk/faq/ind_faq.html
>
> March 2004 Hotsos Symposium - The Burden of Proof
> Dynamic Sampling - an investigation
> March 2004 Charlotte OUG (www.cltoug.org) CBO Tutorial
> April 2004 Iceland
> June 2004 UK - Optimising Oracle Seminar
>
>
> ----- Original Message -----
> From: "Jonathan Lewis" <jonathan_at_jlcomp.demon.co.uk>
> To: <oracle-l_at_freelists.org>
> Sent: Tuesday, March 02, 2004 9:38 AM
> Subject: Re: query slow in 9i, but not slow in 8i
>
>
> >
> > True -
> >
> > If work_area_policy = auto in 9.2, then the
> > pga_aggregate_target is used. Since this
> > defaults to 25M (better check that) and the
> > limit for a process is 5% of total, then the
> > v9 run is probably trying to do its sort with
> > 1.25M, rather than the 90M used by 8i.
> >
>
>
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Received on Tue Mar 02 2004 - 06:42:15 CST