（531）When starting up your ASM instance,you receive the following error:

What is the cause of the error?

A. The ASM_DISKGROUPS parameter is configured for three disk groups:DGROUP1,DGROUP2,and DGROUP3.

The underlying disks for these disk groups have apparently been lost.

B. The format of the ASM_DISKGROUPS parameter is incorrect. It should reference the disk group numbers,not the names of the disk groups

C. The ASM_POWER_LIMIT parameter is incorrectly set to 1.It should be set to the number of disk groups being attached to the ASM instance.

D. The ASM_DISKSTRING parameter is not set;therefore disk discovery is not possible.

E. There is insufficient information to solve this problem.

答案：（D）

解析：

查看ORA-15063异常

ORA-15063: ASM discovered an insufficient number of disks for diskgroup "string" Cause: ASM was unable to find a sufficient number of disks belonging to the diskgroup to continue the operation.

Action: Check that the disks in the diskgroup are present and functioning, that the owner of the ORACLE binary has read/write permission to the disks,

and that the ASM_DISKSTRING initialization parameter has been set correctly.

Verify that ASM discovers the appropriate disks by querying V$ASM_DISK from the ASM instance.

ITPub博客

Oracle 11G OCP 1Z0-053 531

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