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043-014

原创 Linux操作系统 作者:jbymy2000 时间:2012-03-04 11:43:02 0 删除 编辑
14. Consider the following configuration:
/devices/D1 is a member of disk group dgroupA.
/devices/D2 is a member of disk group dgroupA.
/devices/D3 is a member of disk group dgroupA.
You plan to add a new disk, /devices/D4,to the disk group dgroupA.
You execute the following command:
SQL> ALTER DISKGROUP dgroupA ADD DISK '/devices/D*';
Which task would be accomplished by the command?
A. The command adds the new disk, D4, to the disk group.
B. The command would result in an error because the is no disk by the
name "'/devices/D*'"
C. The command will be ignored because disks starting with "D" are al
ready members of the disk group.
D. The command would result in an error because no wildcard character
s can be used in the disk name.
E. The command first detaches all the member disks starting with "D",
and the reattaches them including the new disk.
Answer: A
将D4 添加到 DGROUPA 磁盘组。由于其它磁盘已经是 DGROUPA 磁盘组的成员,
因此即使它们与搜索字符串匹配,第二个语句(哪来的第二个语句,净瞎扯)仍将忽略这些磁盘。向磁盘
组添加磁盘时,ASM 实例将确保该磁盘是可寻址的并且可用,然后,才会对该磁
盘进行格式化并使其重新平衡。由于需要将每个文件的分配单元移到新磁盘上,
因此重新平衡过程非常耗时。

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