Manual vs Auto PGA
- From: "blr_dba" <deepak_blr@xxxxxxxxxxx>
- To: "'ORACLE-L'" <oracle-l@xxxxxxxxxxxxx>
- Date: Sat, 30 Dec 2006 20:31:28 +0530
Hi Gurus.
My query is using big hash joins. I had set PGA_AGGREGATE_TARGET=4GB. But when
I observed the pga statistics, I found that the max. pga used by a session is
300M. That was the only user session running.
Later I used manual PGA and defined the hash_area_size=2GB explicitly. Then
oracle started using the whole hash_area and the query ran faster.
Would like to know why oracle did not allocated teh desired hash_area_size when
I used auto PGA?
Are there any situations where we should use manual pga?
Anything I missed?
Deep
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