How can you reverse the effects of an ALTER DISKGROUP ... DROP DISK command if it has not yet completed？（）  

A、 Issue the ALTER DISKGROUP ... ADD DISK command.

B、 Issue the ALTER DISKGROUP ... UNDROP DISKS command.

C、 Issue the ALTER DISKGROUP ... DROP DISK CANCEL command.

D、 Retrieve the disk from the Recycle Bin after the operation completes.

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• How long will this backup be allowed to run？（）  Backup as compressed backupset duration 2：00 minimize load database

  A、 2 minutes

  B、 2 hours

  C、 2 days

  D、 The command will generate an error.

  E、 This backup is not constrained by any time limitation.

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• What command is used to reset a database to a previous incarnation？（）  

  A、 reset incarnation

  B、 incarnation reset

  C、 reset database to incarnation

  D、 reset database incarnation

  E、 reset databse incarnation number

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• When starting up your ASM instance, you receive the following error: What is the cause of the error?（）

  A、 The ASM_DISKGROUPS parameter is configured for three disk groups: DGROUP1, DGROUP2, and DGROUP3. The underlying disks for these disk groups have apparently been lost.

  B、 The format of the ASM_DISKGROUPS parameter is incorrect. It should reference the disk group numbers, not the names of the disk groups

  C、 The ASM_POWER_LIMIT parameter is incorrectly set to 1. It should be set to the number of disk groups being attached to the ASM instance.

  D、 The ASM_DISKSTRING parameter is not set; therefore disk discovery is not possible.

  E、 There is insufficient information to solve this problem.

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• You are managing Oracle Database 11g with an ASM storage with high redundancy. The following command was issued to drop the disks from the dga disk group after five hours：   ALTER DISKGROUP dga OFFLINE DISKS IN FAILGROUP f2 DROP AFTER 5H；   Which statement is true in this scenario？（）

  A、 It starts the ASM fast mirror resync.

  B、 All the disks in the dga disk group would be OFFLINE and the DISK_REPAIR_TIME disk attribute would be set to 5 hours.

  C、 It drops all disk paths from the dga disk group.

  D、 All the disks in the dga disk group in failure group f2 would be OFFLINE and the DISK_REPAIR_TIME disk attribute would be set to 5 hours.

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• Which of the following does the recover command not do？（）  

  A、 Restore archived redo logs.

  B、 Apply archived redo logs.

  C、 Restore incremental backups.

  D、 Apply incremental backups.

  E、 Restore datafile images.

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