What is the purpose of the RMAN recovery catalog? (Choose all that apply.)
A. It must be used because all RMAN-related backup and recovery metadata information is contained in it.
B. It provides a convenient, optional, repository of backup- and recovery-related metadata.
C. It provides the ability to store RMAN scripts for global use by any database that has access to the
repository.
D. It provides a means of storing all RMAN backup sets physically in an Oracle database server.
E. It provides the ability to store backup records for more than a year.
The recovery catalog provides a means of storing metadata related to a database‘s RMAN backup and recovery operation.Additionally,it provides the ability to store scripts that can be used by any database connecting to the repository via RMAN.Finally,the recovery catalog provides the means to store backup records for longer than a year.
原文：http://www.cnblogs.com/Babylon/p/7810830.html