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You observe that the senior database administrator always uses the following command when connecting to Recovery Manager （RMAN）， and then starts executing commands to backup the database files：  $ rman target /  What would be the effect of this command？（）
A:RMAN would use the current operating system location to place the backup.
B:RMAN would use the control file of the target database to maintain the backup.
C:RMAN would use the recovery catalog of the target database to maintain the backup.
D:RMAN would use the control file of the target database to maintain the backup metadata. 
E:RMAN would use the recovery catalog of the target database to maintain the backup metadata.

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出自：Oracle认证

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