1.259 PARALLEL_INSTANCE_GROUP
Used in conjunction with services or with the INSTANCE_GROUPS
parameter, PARALLEL_INSTANCE_GROUP
lets you restrict parallel query operations to a limited number of instances.
Property | Description |
---|---|
Parameter type |
String |
Syntax |
|
Default value |
There is no default value; parallel execution is enabled across all currently active instances. |
Modifiable |
|
Modifiable in a PDB |
Yes |
Range of values |
Any service name or any group name specified in the |
Basic |
No |
Oracle RAC |
Multiple instances can have different values. |
PARALLEL_INSTANCE_GROUP
is an Oracle RAC parameter that you can specify in parallel mode only. Note that the INSTANCE_GROUPS
parameter has been deprecated.
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 INSTANCE_GROUPS
parameter.
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.