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Re: pga_aggregate_target

From: GovindanK <gkatteri_at_fastmail.fm>
Date: Wed, 01 Sep 2004 12:19:14 -0700
Message-Id: <1094066354.1681.203512054@webmail.messagingengine.com>

<FYI_Verify>
Oracle 9i introduced auto tunning of PGA and can be enabled by setting the PGA_AGGREGATE_TARGET.
It frees quite a bit of RAM.
Also Oracle recommends to use this instead of sort_area_size and can be set online. It can be estimated and set as follow: 1. Set the PGA_AGGREGATE_TARGET to (select value from v$pgastat where name = 'total PGA allocated';)
2. It can further be tuned using v$pga_advice. Use this table to find out more appropriate value where the
ESTD_OVERALLOC_COUNT is 0 and ESTD_PGA_CACHE_HIT_PERCENTAGE is near 100.

</FYI_Verify>

HTH
GovindanK

On Wed, 1 Sep 2004 09:08:21 -0700 (PDT), "Peter Barnett" <regdba_at_yahoo.com> said:
> Has anyone used this parameter in 9i (9.2.0.4). I
> have a real turkey of a vended application that is a
> resource hog. The queries have too many outer joins,
> select distincts and minus's to count. Usually, all
> in the same query.
>
> With no control over the application, if this
> parameter works as advertised, this seems like a good
> place to use it.
>
> Any experiences or thoughts?
>
>
> =====
> Pete Barnett
> Lead Database Administrator
> The Regence Group
> pnbarne_at_regence.com
>
>
>
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Received on Wed Sep 01 2004 - 20:16:42 CDT

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