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You are working on a test database where instance recovery takes a considerable amount of time. How can reduce the recovery time？（）
A:By multiplexing the control files
B:By multiplexing the redo log files
C:By decreasing the size of redo log files
D:By configuring mean time to recover （MTTR） to a lower value
E:By setting the UNDO_RETENTION parameter to a higher value

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出自：Oracle认证

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