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When starting up your ASM instance, you receive the following error: SQL> startup pfile=$ORACLE_HOME/dbs/init+ASM.ora ASM instance started Total System Global Area 104611840 bytes Fixed Size 1298220 bytes Variable Size 78147796 bytes ASM Cache 25165824 bytes ORA-15032: not all alternations performed ORA-15063: ASM discovered an insufficient number of disks for diskgroup "DGROUP3" ORA-15063: ASM discovered an insufficient number of disks for diskgroup "DGROUP2" ORA-15063: ASM discovered an insufficient number of disks for diskgroup "DGROUP1" In trying to determine the cause of the problem, you issue this query: SQL> show parameter asm What is the cause of the error?
Correct Answer: D
Explanation/Reference: Explanation: ASM_DISKSTRING specifies an operating system-dependent value used by Automatic Storage Management to limit the set of disks considered for discovery. When a new disk is added to a disk group, each Automatic Storage Management instance that has the disk group mounted must be able to discover the new disk using the value of ASM_DISKSTRING. In most cases, the default value will be sufficient. Using a more restrictive value may reduce the time required for Automatic Storage Management to perform discovery, and thus improve disk group mount time or the time for adding a disk to a disk group. A "?" at the beginning of the string gets expanded to the Oracle home directory. Depending on the operating system, wildcard characters can be used. It may be necessary to dynamically change ASM_DISKSTRING before adding a disk so that the new disk will be discovered. An attempt to dynamically modify ASM_DISKSTRING will be rejected and the old value retained if the new value cannot be used to discover a disk that is in a disk group that is already mounted.