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You want to create the Recovery Manager （RMAN） Virtual Private Catalog （VPC） to maintain a separation of responsibilities along with a consolidation of RMAN repository.  Which condition must be met before you create the VPC？（）  
A: A base catalog exists
B: The recovery catalog is empty
C: The base recovery catalog must be dropped
D: A target database is registered in the recovery catalog

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出自：Oracle认证

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