324.Your database is up and running and one of your three control files is accidentally erased. You start
RMAN and run the following command:
RESTORE CONTROLFILE FROM AUTOBACKUP;
Which of the following statements is true? (Choose all that apply.)
A. The command restores only the missing control file.
B. The command restores all the control files.
C. The command fails because the database is running.
D. This is the correct way to address this problem.
E. This is not the correct way to address this problem.
Answer: CE
答案解析：
恢复控制文件在要在nomount状态下恢复的，所以说这个不是一个正确的解决方法。
参考：http://docs.oracle.com/cd/E11882_01/backup.112/e10642/rcmadvre.htm#BRADV367
If you are not using a recovery catalog, then you must restore your control file from an autobackup. To restore the control file from autobackup, the database must be in a NOMOUNT state.