Indentify two advantages of using recovery catalog instead of the control file of the database in
Recovery Manager (RMAN). (Choose two.)
A. You can use RMAN stored scripts
B. Recovery is faster if data is stored in catalog in addition to the control file “First Test,
C. You can store backup information of all registered databases in one place
D. Database backups are automatically deleted when they are older than the specified time period
原文：http://www.cnblogs.com/Babylon/p/7843880.html