单选题How can you reverse the effects of an ALTER DISKGROUP ... DROP DISK command if it has not yetcompleted?（）A Issue the ALTER DISKGROUP ... ADD DISK command.B Issue the ALTER DISKGROUP ... UNDROP DISKS command.C Issue the ALTER DISKGROUP ... DROP DISK CAN

第1题：

第2题：

How can you reverse the effects of an ALTER DISKGROUP ... DROP DISK command if it has alreadycompleted?（）

• 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

第3题：

第4题：

You are managing an ASM instance. You previously issued the following statements: ALTER DISKGROUP dg1 DROP DISK disk2; ALTER DISKGROUP dg1 DROP DISK disk3; ALTER DISKGROUP dg1 DROP DISK disk5; You want to cancel the disk drops that are pending for the DG1 disk group. Which statement should you issue?（）

• A、ALTER DISKGROUP dg1 UNDROP disk2, disk3, disk5;
• B、ALTER DISKGROUP dg1 UNDROP;
• C、ALTER DISKGROUP dg1 UNDROP DISKS;
• D、You cannot cancel the pending disk drops.

第5题：

What is the net effect of the following command？（）   alter diskgroup dgroup1 drop disk abc；

• A、 The disk ABC will be dropped from the disk group. Since you did not issue a rebalance command，the data on that disk will be lost.
• B、 The command will raise an error indicating that you need to rebalance the disk group to remove the data from that disk prior to dropping the disk.
• C、 The disk group will be automatically rebalanced during the drop operation. Once the rebalancing is complete，the disk will be dropped.
• D、 This command will fail because you cannot drop a specific disk in an ASM disk group.
• E、 The disk drop command will be suspended for a predetermined amount of time，waiting for you to also issue an alter diskgroup rebalance command. Once you have issued the rebalance command，ASM will proceed to rebalance the disk group and then drop the disk.

第6题：

第7题：

Which two commands never trigger an implicit rebalancing within the disk group?（） (Choose two.)

• A、ALTER DISKGROUP misc MOUNT;
• B、ALTER DISKGROUP misc DROP DISK misc2;
• C、ALTER DISKGROUP misc CHECK ALL NOREPAIR;
• D、ALTER DISKGROUP misc RESIZE ALL SIZE 1023m;
• E、ALTER DISKGROUP dgroupA ADD DISK '/devices/A*';

第8题：

第9题：

After executing the command alter diskgroup disk group2 drop disk dg2a； you issue the following command from the ASM instance：   Select group_number， count（*） from v$asm_operation；   What is the implication if the query against V$ASM_OPERATION returns zero rows？（）  

• A、 The drop disk operation is still proceeding and you cannot yet run the undrop disks operation.
• B、 The drop disk operation is complete and you can run the undrop disks command if needed.
• C、 The drop disk operation is complete and you cannot run the undrop disk command.
• D、 The query will fail since there is not a V$ASM_OPERATION view available in an ASM instance. 
• E、 None of the above is true.

第10题：

Examine the following ALTER command: SQL> ALTER DISKGROUP dgroup1 UNDROP DISKS; What is the purpose of the command?（）

• A、It cancels all pending disk drops within the disk group.
• B、It restores disks that are being dropped as the result of a DROP DISKGROUP operation
• C、It mounts disks in the disk group for which the drop-disk operation has already been co pleted
• D、It restores all the dropped disks in the disk group for which the drop-disk operation has already been completed
• E、It adds previously dropped disks back into the disk group