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Which statement about Automatic Memory Management with Oracle 11g is true？（）  
A: You cannot specify MEMORY_TARGET if you explicitly specify SGA_TARGET or  PGA_AGGREGATE_ TARGET values that are greater than zero in your parameter file.
B: Oracle can reallocate memory between the SGA and PGA automatically as needed.
C: To use Automatic Memory Management， you must explicitly set both the MEMORY_TARGET and MEMORY_MAX_TARGET parameters in your parameter file.
D: You can set the MEMORY_TARGET parameter to a maximum value of the current SGA size plus the current PGA size.

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出自：Oracle认证

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