If you back up a database without connecting to the recovery catalog, which operations will cause the recovery catalog to be updated? (Choose all that apply.)
A. The next time you back up the database when you are also connected to the recovery catalog and the target database
B. The next time you are connected to the target database and the recovery catalog database and issue the resync command
C. The next time you connect RMAN to just the recovery catalog
D. The next time you connect to the recovery catalog and the target database with RMAN
E. Connecting to the recovery catalog and issuing the resync all databases command
Anytime you execute an RMAN backup operation when connected to the recovery catalog,RMAN will automatically resynchronize the recovery-catalog metadata with the database control file.The resync command is used to manually resynchronize the recovery catalog with the database.
原文：http://www.cnblogs.com/Babylon/p/7813958.html