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.
C.
Issue the ALTER DISKGROUP � DROP DISK CANCEL command.
D.
Retrieve the disk from the Recycle Bin after the operation completes.
Explanation:
Use the undrop_disk_clause cancel the drop of disks from the disk group. This clause is not
relevant for disks that have already been completely dropped from the disk group or for disk
groups that have been completely dropped.
http://download.oracle.com/docs/cd/B19306_01/server.102/b14200/statements_1006.htm#i21687
80 Use the CREATE DISKGROUP clause to create a collection of disks.
http://download.oracle.com/docs/cd/B19306_01/server.102/b14200/statements_5008.htmUse the add_disk_clause to add one or more disks to the disk group and specify attributes for the
newly added disk.
http://download.oracle.com/docs/cd/B19306_01/server.102/b14200/statements_1006.htm#i21687
80
The answer is wrong. It should be B.
“undrop_disk_clause
Use this clause to cancel the drop of disks from the disk group. You can cancel the pending drop of all the disks in one or more disk groups (by specifying diskgroup_name) or of all the disks in all disk groups (by specifying ALL).
This clause is not relevant for disks that have already been completely dropped from the disk group or for disk groups that have been completely dropped. This clause results in a long-running operation. You can see the status of the operation by querying the V$ASM_OPERATION dynamic performance view.”
ALTER DISKGROUP
http://docs.oracle.com/cd/E11882_01/server.112/e41084/statements_1007.htm
ah… sorry. The answer is correct because Drop Disk is completed.