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pga_aggregate_target initialization parameter 

Oracle Tips by Burleson Consulting

Oracle9i introduced a new Oracle parameter called pga_aggregate_target . When the pga_aggregate_target parameter is set and you are using dedicated Oracle connections, Oracle9i will ignore all of the PGA parameters in the Oracle file, including sort_area_size, hash_area_size and sort_area_retained_size .

Oracle recommends that the value of pga_aggregate_target be set to the amount of remaining memory (less a 10 percent overhead for other UNIX tasks) on the UNIX server after the instance has been started.

Once the pga_aggregate_target has been set, Oracle will automatically manage PGA memory allocation based upon the individual needs of each Oracle connection. Oracle9i allows the pga_aggregate_target parameter to be modified at the instance level.

My notes on pga_aggregate_target include:

 

 

 

 
  
 

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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

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