单选题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 traceB bring database to the MOUNT stateC open a connection to the RMAN recovery catalog， which contains the RMAN metadata for the target databaseD set the database ID （DBID）， but only if the DB_NAME parameter associated with the target database is unique in the recovery catalog
单选题
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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