You have lost all your RMAN backup set pieces due to a disk failure. Unfortunately, you have an
automated cross-check script that also does a delete expired backupset command. You have restored all the backup set pieces from tape. What command would you use to get those backup set pieces registered in the recovery catalog and the control file of the database again?
A. register database
B. recover catalog
C. load backupset
D. synch metadata
E. catalog start with
The catalog command is used to load backup set pieces that do not already exist into the recovery catalog or the control file.
原文：http://www.cnblogs.com/Babylon/p/7815463.html