Which two statements are true about the UNDROP clause of the ALTER DISKGROUP statement?
(Choose two.)
A.
It cancels pending drops of disks dropped using the DROP DISKGROUP command.
B.
ASM disks can never be undropped as a result of a DROP DISKGROUP.
C.
It automatically unmounts the disks after successfully undropping them.
D.
Disks must be rebalanced manually after successfully undropping them.
E.
It is not possible to cancel pending drops of disks dropped using the force option.
Correct: B, E
I think AE
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).
https://docs.oracle.com/database/121/SQLRF/statements_1009.htm#SQLRF01113
It should be the commnad ALTER DISKGROUP.. DROP DISK.
The commnad DROP DISKGROUP cannot be undone.
Correct: B, E
A.- NOT Correct.
It cancels pending drops of disks dropped using the DROP DISKGROUP command.
B.- Correct
ASM disks can never be undropped as a result of a DROP DISKGROUP.
C.-Huh? Not Correct
It automatically unmounts the disks after successfully undropping them.
D.-Not necessarily
Disks must be rebalanced manually after successfully undropping them.
E.- Correct
It is not possible to cancel pending drops of disks dropped using the force option.
Source: https://docs.oracle.com/cd/B28359_01/server.111/b31107/asmdiskgrps.htm#CHDFBFGC
(find: Undropping Disks in Disk Groups)
B,E
although i’m not sure that C,D are incorrect