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RE: Automatic PGA Memory Management via PGA_AGGREGATE_TARGET para

From: Freeman, Robert <>
Date: Mon, 04 Mar 2002 11:53:24 -0800
Message-ID: <>

I cover this topic and many others in my Oracle9i New Features book.... :-))  


Robert G. Freeman - Oracle8i OCP
Oracle DBA Technical Lead
CSX Midtier Database Administration

The Cigarette Smoking Man: Anyone who can appease a man's conscience can take his freedom away from him.  

-----Original Message-----
Sent: Monday, March 04, 2002 1:58 PM
To: Multiple recipients of list ORACLE-L

I just stumbled upon the "Automatic PGA Memory Management" section of the 9i docs. I've never heard of this before. Does anyone know how long it's been around? Anyone using it found any bugs, concerns, etc.?  

Granted, this is intended for *dedicated* server mode, it seems like a good option for our Test databases and perhaps other databases that have only a handful of users and don't require MTS. By setting PGA_AGGREGATE_TARGET=X, where X can be a value in K, M, or G, Oracle will automatically distribute this memory allocation to dedicated sessions instead of using SORT_AREA_SIZE. Here's an excerpt from the docs:  

"Oracle does not recommend using the SORT_AREA_SIZE parameter unless the instance is configured with the shared server option. Oracle recommends that you enable automatic sizing of SQL working areas by setting PGA_AGGREGATE_TARGET instead. SORT_AREA_SIZE is retained for backward compatibility."    

Learn something new every day in Oracle land...    


David B. Wagoner

Database Administrator

Arsenal Digital Solutions Worldwide, Inc.

8000 Regency Parkway, Suite 110

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Please see the official ORACLE-L FAQ:

Author: Freeman, Robert

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