ORACLE 参数之 ASM_DISGROUPS

ASM_DISKGROUPS

PropertyDescriptionParameter typeStringSyntaxASM_DISKGROUPS = diskgroup [, diskgroup ] ...Default valueThere is no default value.ModifiableALTER SYSTEMRange of valuesComma-separated list of strings, up to 30 charactersOracle RACMultiple instances can have different values.

Note:

This parameter may only be specified in an Automatic Storage Management instance.

ASM_DISKGROUPS specifies a list of names of disk groups to be mounted by an Automatic Storage Management instance at instance startup. Oracle ignores the value that you set for ASM_DISKGROUPS when you specify the NOMOUNT option at startup or when a ALTER DISKGROUP ALL MOUNT statement is issued.

Automatic Storage Management (ASM) automatically adds a disk group to this parameter when the disk group is successfully created or mounted, and automatically removes a disk group from this parameter when the disk group is dropped or dismounted.

Issuing the ALTER DISKGROUP...ALL MOUNT or ALTER DISKGROUP...ALL DISMOUNT command does not affect the value of this parameter.

该变量只是在ASM实例中被设置；

ASM_DISGROUPS 参数列出了ASM实例在启动的时候MOUNT的磁盘组列表，如果在启动时，手动指定了NOMOUNT选项或者执行ALTER DISKGROUP ALL MOUNT语句时，该参数被忽略； 在你成功创建一个磁盘组或MOUNT一个磁盘组时，ASM自动维护到该变量列表；反之，如果磁盘组被DROP或DISMOUNT，那么自动会在列表中去除该磁盘组名称；

OCP 考核题库：

Q129. Which initialization parameter in an ASM instancespecifies the disk groups to be automatically mounted at instance startup?

 

A.ASM_DISKMOUNT

B.ASM_DISKGROUPS

C.ASM_DISKSTRING

D.ASM_MOUNTGROUP

 

Answer: B

相关参考：

http://docs.oracle.com/cd/E11882_01/server.112/e18951/asminst.htm#OSTMG10141