OCP-1Z0-053-V12.02-153题

153.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.

Answer: C

答案解析：

参考：http://blog.csdn.net/rlhua/article/details/12972983

只能取消disk5的删除，因为disk2, disk3的删除操作已经完成，只要删除操作还没有真正完成，就可以使用undrop取消删除磁盘的操作，

UNDROP命令仅对磁盘的暂挂删除操作起作用；它对于已经完成的删除操作没有影响。