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You can control instance recover performance by setting parameters to define targets for（）
A:The size of the redo buffer in SGA. 
B:The instance that will perform recovery in Real Application Cluster database. 
C:The number of blocks to be read during instance recovery, or the time needed to complete instance recovery. 
D:The number of passes through the redo logs made by the recovery process to identify blocks needing recovery.

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出自：Oracle认证

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