350.Why would you execute the report obsolete command?
A. To list all backups that were no longer available for restore operations
B. To list all backups that had aged beyond the RMAN retention criteria
C. To list all backup set pieces listed in control-file or recovery-catalog metadata that are not on the
backup media
D. To list all datafiles that are no longer part of the database and thus do not need to be backed up
E. To list all archived redo logs that are no longer needed for any database recovery
Answer: B
答案解析：
report obsolete执行这条命令，显示所有过时的备份，过时的意思是超过了保留策略所设定的冗余或者天数。