053-673

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
5) Apply the archived redo logs
6) Open the database
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

　　此题考点是使用镜像拷贝来恢复非系统表空间的数据文件。由于备份是镜像拷贝，可以使用 restore 命令或 switch 命令来进行重建。
　　首先将数据文件 offline，使用 switch to 来重建数据文件，或 restore to 来重建数据文件 ，再 recover数据文件，使数据文件 online，最后打开数据库。