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
答案解析：
参考：http://blog.csdn.net/rlhua/article/details/13169205
目录命令的目的是在，控制文件和恢复目录中涉及到备份集片中创建元数据。
参考：http://docs.oracle.com/cd/E11882_01/backup.112/e10643/rcmsynta008.htm#RCMRF109
CATALOG
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