|Default value||There is no default value; parallel execution is enabled across all currently active instances.|
|Range of values||Any service name or any group name specified in the
|Real Application Clusters||Multiple instances can have different values.|
PARALLEL_INSTANCE_GROUP is a Real Application Clusters parameter that you can specify in parallel mode only. Used in conjunction with services or with the
INSTANCE_GROUPS parameter, it lets you restrict parallel query operations to a limited number of instances.
This parameter identifies the parallel instance group Oracle will use for spawning parallel execution processes. If used in conjunction with services, then parallel operations will spawn parallel execution processes only on instances defined in the service. If used in conjunction with
INSTANCE_GROUPS, then parallel operations will spawn parallel execution processes only on instances that specify a matching group in their
If the value assigned to
PARALLEL_INSTANCE_GROUP is the name of a service or group that does not exist, then the operation runs serially. No parallelism is used.
See Also:Oracle Real Application Clusters Administration and Deployment Guide for more information on parallel query execution in a Real Application Clusters environment