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You executed the following command in Recovery Manager （RMAN）：  RMAN> RESTORE CONTROLFILE；  Which operation must you perform before this command is executed？（） 
A:back up the control file to trace
B:bring database to the MOUNT state
C:open a connection to the RMAN recovery catalog， which contains the RMAN metadata for the target database
D:set the database ID （DBID）， but only if the DB_NAME parameter associated with the target database is unique in the recovery catalog

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出自：Oracle认证

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