本文介绍了在Oracle ASM中如何撤销已完成的ALTER DISKGROUP...DROP DISK命令的效果。详细解释了为什么不能使用UNDROP DISKS子句来撤销已经从磁盘组中完全移除的磁盘，并给出了正确的解决办法。
QUESTION 176
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.
Answer: A
同539题：http://blog.youkuaiyun.com/rlhua/article/details/15020285
对比534题：http://blog.youkuaiyun.com/rlhua/article/details/15020571
Explanation/Reference:
Section: Database Architecture & Resource Management, RAC, ASM
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#i2168780
Use the CREATE DISKGROUPclause to create a collection of disks.
http://download.oracle.com/docs/cd/B19306_01/server.102/b14200/statements_5008.htm
Use 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#i2168780
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