1. Which two are true about the Program Global Area(PGA)and its management in an Oracle database instance（）?
   A、PGA AGGREGATE LIMII is a hard limit on the PGA size for any one session
   B、The entire PGA is located in the System Global Area(SGA)when using shared servers
   C、The private SQL area(UGA)is located in the System Global Area(SGA)when using shared servers
   D、Sorts and Hash Joins use PGA memory.
   E、The private SQL area(UGA)is located in the System Global Area(SGA)when using dedicated servers

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