Create one catalog database per Database Administrator to share the maintenance workload
Restrict SYSDBA and SYSOPER access from Database Administrators and yet allow them to perform database backup and recovery related tasks i.e. Virtualization of the SYSDBA and SYSOPER access
Maintain only one database for the RMAN repository catalog yet establish secure boundaries for individual database owners to manage their own virtual repositories
Make Oracle 11g database compliant with global Backup and Recovery standards