OCP 1Z0 053 196

196.What is the purpose of the catalog command? 
A. To review RMAN control file and recovery catalog metadata and ensure that its correct 
B. To delete RMAN backup-related metadata from the recovery catalog 
C. To create metadata in the control file and the recovery catalog related to backup set pieces 
D. To create a report that lists database backups 
E. To rebuild the recovery catalog 
Answer: C 

对c的说法存疑（To create metadata in the control file）

http://docs.oracle.com/cd/E11882_01/backup.112/e10643/rcmsynta008.htm#i79811

CATALOG

Purpose

Use the CATALOG command to do the following:

• Add backup pieces and image copies on disk to the RMAN repository

• Record a data file copy as a level 0 incremental backup in the RMAN repository, which enables you to use it as part of an incremental backup strategy