673.In Recovery Manager (RMAN), you are taking image copies of the datafiles of your production
database and rolling them forward as regular intervals. You attempt to restart your database instance after
a regular maintenance task, you realize that one of the data files that belongs to the USERS tablespace is
damaged and you need to recover the datafile by using the image copy. You could perform the following
steps to accomplish this:
1) Mount the database
2) Take the data file offline
3) Bring the data file online
4) Use the RMAN SWITCH TO command to switch the image copy
7) Use the RMAN RESTORE TO command to switch to the image copy
Which two options illustrate the correct sequence of steps that you could follow? (Choose two.)
A. 2, 6, 4, 5, 3
B. 1, 2, 4, 5, 3, 6
C. 1, 2, 4, 6, 3
D. 1, 2, 7, 5, 3, 6
Answer: BD
答案解析：
因为是users表空间的数据文件损坏，不是关键数据文件损坏，即可以使用数据文件offline下进行恢复。
又因为是image copy，所以可以使用switch to来还原数据文件，也可以使用restore to来还原数据文件
最后恢复文件，使数据文件online，然后再打开数据库。