86. View the Exhibit to examine the output for the CROSSCHECK BACKUP command.
Which statement is true about the output of the command?
A.The backup piece is expired as the new backup is available.
B.The backup piece is expired because the operating-system file was not found.
C.The backup piece is expired because the retention period for the backup has expired.
D.The backup piece is expired because the backup set to which it belongs is not complete.
Answer: B
答案解析：
参考：http://blog.csdn.net/rlhua/article/details/12617847
Crosscheck （交叉检验）：RMAN 可自动删除过时备份，但用户也可使用操作系统命令删除这些备份。如果备份不是使用RMAN 删除的，那么在目录与目录实际内容之间执行交叉检验之前，目录并不知道备份是否缺失。