053-419

In Oracle 11g, by default which one of the following conditions implicitly enables Automatic PGA Memory Management?
A. Setting a nonzero value for SGA_TARGET
B. Configuring Automatic Shared Memory Management
C. Configuring Automatic Memory Management
D. Setting a nonzero value for SGA_MAX_SIZE and PGA_AGGREGATE_TARGET
E. None of the above

　　By default,Oracle 11g is configured for Automatic Memory Mangement.If you configure Automatic Shared Memory Management and make no other changes,you will implicitly enable Automatic PGA Memory Management.Setting SGA_TARGET to a nonzero value doesn't immediately enable Automatic Shared Memory Management because you may still have Automatic Memory Management enabled.Setting the parameter SGA_MAX_SIZE to nonzero puts a cap on manual SGA configuration,but again it does not implement Manual Shared Memory Management.The value of PGA_AGGREGATE_TARGET is relevant only if Automatic Memory Managements is not configured,so you must also set MEMORY_TARGET to zero for it to take effect.