PGA_AGGREGATE_TARGET参数的变更

从Oracle9i开始,oracle引入了自动pga管理的新特型,pga_aggregate_target参数用于控制pga的总体期望目标:

$ sqlplus "/ as sysdba"

sql*plus: release 9.2.0.4.0 - production on thu apr 6 16:40:13 2006

copyright (c) 1982, 2002, oracle corporation.  all rights reserved.

connected to:
oracle9i enterprise edition release 9.2.0.4.0 - 64bit production
with the partitioning option
jserver release 9.2.0.4.0 - production

sql> show parameter pga

name                                 type        value
------------------------------------ ----------- ------------------------------
pga_aggregate_target                 big integer 1073741824
sql> 

但是在oracle9i中，pga_aggregate_target参数仅对专用服务器模式下（dedicated server）的专属连接有效，对共享服务器（shared server）连接无效；从oracle10g开始pga_aggregate_target对专用服务器连接和共享服务器连接同时生效。