Re: pga_aggregate_target
- From: "GovindanK" <gkatteri@xxxxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx, oracle-l@xxxxxxxxxxxxx
- Date: Wed, 01 Sep 2004 12:19:14 -0700
<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@xxxxxxxxx> 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@xxxxxxxxxxx
>
>
>
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