9.3. Defining ASM Initialization Parameters
A number of initialization parameters either are specific to ASM instances or have new values within an ASM instance. An SPFILE is highly recommended over an initialization parameter file for an ASM instance. For example, parameters such as ASM_DISKGROUPS are automatically maintained when a disk group is added or dropped, potentially freeing you from ever having to manually change this value.
These initialization parameters include the following:
INSTANCE_TYPE
For an ASM instance, the INSTANCE_TYPE parameter has a value of ASM. The default, for a traditional Oracle instance, is RDBMS.
DB_UNIQUE_NAME
The default value for the DB_UNIQUE_NAME parameter is +ASM and is the unique name for a group of ASM ...
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