OCP-1Z0-053-V12.02-543题

543.As the DBA, you run the following query on your ASM instance.

What is the implication of the results of the query? (Choose two.)

SQL> select group_number, name, state from v$ASM_DISKGROUP;

GROUP_NUMBER NAME STATE

0 DGROUP1 DISMOUNTED

2 DGROUP2 MOUNTED

3 DGROUP3 MOUNTED

A. The DGROUP1 disk group was unmounted by another DBA.

B. A datafile has been lost, causing the ASM disk group DGROUP1 to go into the DISMOUNTED state

C. One of the redundant disks (DGROUP1) has been lost in a disk group.

D. This query has no meaning in an ASM instance.

E. A disk associated with a disk group was discovered after the ASM instance initially opened.

Answer: AE

答案解析：

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

sys@TEST0924>  select group_number, name, state from v$ASM_DISKGROUP;

GROUP_NUMBER NAME                           STATE

------------ ------------------------------ -----------

           1 DATA                           MOUNTED

           2 RECOVERY                       MOUNTED

V$ASM_DISKGROUP displays one row for every ASM disk group discovered by the ASM instance on the node.

V$ASM_DISKGROUP

Describes a disk group (number, name, size related info, state, and redundancy type). This view performs disk discovery every time it is queried.