Relevance of the parameter PGA_AGGREGATE_TARGET

Hello

The PGA_AGGREGATE_TAGET parameter is defined as below in the oracle documentation.

+ "PGA_AGGREGATE_TARGET specifies the overall target PGA memory available for all server processes associated with the instance. +

What ever we value for this parameter, for example I put it at 200M. But oracle it still increases the value according to its condition and the availability of (sharp RAM).

On the one hand to my database, I see PGA utilizaion 800M in AWR reports.

When oracle increases internal PGA value according to his need, so what is the relevance of the PGA_AGGREGATE_TARGET parameter.

Maybe I'm missing somewhere in the parameter definition (Meaning), please correct me if I'm wrong.

My version of oracle 10.2.0.3.

Thanks in advance!


Best regards
oratest

There is an explanation in the 10g Performance Tuning Guide, Chapter 7, under the PGA memory management.

Query V$ PGA_TARGET_ADVICE. If ESTD_OVERALLOC_COUNT is not null for the PGA_TARGET_FOR_ESTIMATE that corresponds to your setting of PGA_AGGREGATE_TARGET, then Oracle will ignore your settings and allot more if necessary.

Kind regards
Bob

Tags: Database

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