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Which statement is true regarding RMAN components？（）
A:Each target database requires its own recover catalog. 
B:RMAN scripts can be stored in the recovery catalog or the target control file. 
C:A channel is a stream of data to a device type and corresponds to one server session. 
D:The RMAN executable interprets sever session commands and establishes connections to the target database.

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出自：Oracle认证

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