INSTANCE_GROUPS

Parameter type	String
Syntax	INSTANCE_GROUPS = group_name [, group_name ... ]
Default value	There is no default value.
Parameter class	Static
Range of values	One or more instance group names, separated by commas
Oracle9i Real Application Clusters	Multiple instances can have different values.

INSTANCE_GROUPS is an Oracle9i Real Application Clusters parameter that you can specify only in parallel mode. Used in conjunction with the PARALLEL_INSTANCE_GROUP parameter, it lets you restrict parallel query operations to a limited number of instances.

This parameter specifies one or more instance groups and assigns the current instance to those groups. If one of the specified groups is also specified in the PARALLEL_INSTANCE_GROUP parameter, then Oracle allocates query processes for a parallel operation from this instance.

See Also: Oracle9i Real Application Clusters Administration for more information on parallel query execution in an Oracle9i Real Application Clusters environment "PARALLEL_INSTANCE_GROUP"