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單項選擇題

You have discovered that a disk failure occurred on DISK1 where the data files belonging to the SYSTEM and USER_DATA tablespaces is stored. The database is currently open and you need to recover the data files. You will restore the data files to DISK2. What is the correct sequence of RMAN commands to restore and recover the data files？（）

A.A
B.B
C.C
D.D

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單項選擇題

After the recovery is complete， which command should you execute？（）

A.ALTER DATABASE OPEN；
B.ALTER DATABASE CLEAR LOGFILE；
C.ALTER DATABASE OPEN RESETLOGS；
D.ALTER DATABASE OPEN NORESETLOGS；

單項選擇題

While connected to the database，a user on a PC receives a fatal error and the machine reboots. Which background process cleans up the failed connection？（）

A.ARCn
B.CKPT
C.DBWn
D.LGWR
E.PMON
F.SMON