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Which statements about the MEMORY_TARGET initialization parameter are true？（） 
A: MEMORY_TARGET can be increased up to the value of MEMORY_MAX_TARGET， if  MEMORY_MAX_TARGET is set to a value greater than zero
B: MEMORY_MAX_TARGET defaults to a value of zero if MEMORY_TARGET is not set
C: MEMORY_TARGET represents the total amount of memory that can be allocated to SGA and PGA memory structures.
D: MEMORY_TARGET is static and cannot be modified without shutting down the instance

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出自：Oracle认证

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