| Property | Description |
|---|---|
|
Parameter type |
Boolean |
|
Default value |
|
|
Modifiable |
|
|
Range of values |
|
|
Basic |
No |
|
Oracle RAC |
Multiple instances can have different values. |
Note:
The PARALLEL_IO_CAP_ENABLED parameter is deprecated. It is retained for backward compatibility only. It is replaced by the PARALLEL_DEGREE_LIMIT parameter when set to IO.
PARALLEL_IO_CAP_ENABLED specifies whether Oracle caps the default degree of parallelism to no greater than what the I/O system can support. This new value is calculated based on the results of the resource manager's I/O calibration package.
If PARALLEL_IO_CAP_ENABLED is set to true and the database I/O capacity has been calibrated, then Oracle will reduce the default degree of parallelism if the I/O capacity cannot support the available number of CPUs. To calibrate the I/O capacity, use the DBMS_RESOURCE_MANAGER.CALIBRATE_IO procedure to measure the system's I/O capacity. Oracle then computes the degree of parallelism so as not to exceed the system's I/O capacity.
See Also: