703. Given below are RMAN commands to enable ba ckup optimization and set the retention policy:
The USERS tablespace has never been backed up. Y ou take the USERS tablespace offline on Monday.
View the Exhibit to examine the operations performed by using RMAN. Which two statements are true
about the backup of the USERS tablespace? (Choose two.)
A.It will be backed up as a part of database backup on Friday.
B.It will be backed up as a part of database backup on Tuesday.
C.It will not be backed up as a part of database backup on Wednesday.
D.The command on Sunday deletes the backup of the USERS tablespace taken on Tuesday.
Answer: AB
答案解析：
The USERS tablespace has never been backed up. Y ou take the USERS tablespace offline on Monday。
又因为 configurre backup optimization on,即在备份时跳过offline或者read_only的数据。
在星期二备份时，因为之前没有备份，故在星期二时要备份一下。之后即不再备份了。故B正确，A错误。C正确。
而D答案，命令，删除过期备份，因为users表空间只有一次备份，故根据冗余2的备份策略，不存在过期的问题。
故正确答案选BC
原文：http://blog.csdn.net/rlhua/article/details/19835841
