多选题Which two commands never trigger an implicit rebalancing within the disk group?（） (Choose two.)AALTER DISKGROUP misc MOUNT;BALTER DISKGROUP misc DROP DISK misc2;CALTER DISKGROUP misc CHECK ALL NOREPAIR;DALTER DISKGROUP misc RESIZE ALL SIZE 1023m;EALTER

第1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2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3题：

Consider the following configuration：   /devices/diskP1 is a member of disk group grp1.        /devices/diskP2 is a member of disk group grp1.        /devices/diskP3 is a member of disk group grp1.        /devices/diskP4 is a candidate disk.        /devices/diskQ1 is a member of disk group grp2.        /devices/diskQ2 is a member of disk group grp2.        /devices/diskQ3 is a member of disk group grp2.        /devices/diskQ4 is a candidate disk.   Which command will add the disk /devices/diskP4 to the disk group， grp1？（）  

• A、 ALTER DISKGROUP grp1  ADD DISK ’/devices/diskP1’，  ADD DISK ’/devices/diskP4’；
• B、 ALTER DISKGROUP grp1  ADD DISK ’/devices/disk*4’；
• C、 ALTER DISKGROUP grp1  ADD DISK ’/devices/diskP*’；
• D、 ALTER DISKGROUP grp1  ADD DISK ’/devices/diskQ*’，  ADD DISK ’/devices/diskP*’；

第4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

第5题：

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

• 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6题：

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

• A、 Issue the ALTER DISKGROUP ... ADD DISK command.
• B、 Issue the ALTER DISKGROUP ... UNDROP DISKS command.P.... DROP DISK CANCEL command.
• C、 Issue the ALTER DISKGROU
• D、 Retrieve the disk from the Recycle Bin after the operation completes.

第7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 completed
• 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

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第13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14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15题：

Examine the following command：   ALTER DISKGROUP data MOUNT FORCE；   In which scenario can you use the above command to mount the disk group？（）  

• A、 when ASM disk goes offline
• B、 when one or more ASM files are dropped
• C、 when some disks in a disk group are offline
• D、 when some disks in a failure group for a disk group are rebalancing

第16题：

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.

第17题：

You want to perform the following operations for the DATA ASM disk group： -Verify the consistency of the disk.  -Cross-check all the file extent maps and allocation tables for consistency. check whether the alias metadata directory and file directory are linked correctly.  -Check that ASM metadata directories do not have unreachable allocated blocks.   Which command accomplishes these tasks（）？

• A、 ALTER DISKGROUP data CHECK
• B、 ALTER DISKGROUP data CHECK DISK
• C、 ALTER DISKGROUP data CHECK FILE
• D、 ALTER DISKGROUP data CHECK DISK IN FAILURE GROUP 1

第18题：

Examine the CREATE DISKGROUP command used to create a disk group：   SQL> CREATE DISKGROUP misc EXTERNAL REDUNDANCY  DISK ’ORCL： FRA3’ NAME misc1， ’ORCL： FRA4’ NAME misc2；   In which situation would you use this method of disk group creation？（）

• A、 When two-way disk mirroring is required for the allocation units
• B、 When three-way disk mirroring is required for the allocation units
• C、 When using hardware mirroring or RAID
• D、 When disk mirroring is required for the Automatic Storage Management （ASM） disks

第19题：

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

• 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*’

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