When you cast out data for a data item, you must obtain the cast-out lock for the data item. After you have cast out the data and written it to permanent storage, you must free the cast-out lock; otherwise, the system is unable to reclaim resources associated with the data item.

To release a cast-out lock for a data item, use IXLCACHE REQUEST=UNLOCK_CASTOUT or REQUEST=UNLOCK_CO_NAME. You can free the cast-out lock for one data item at a time or unlock multiple cast-out locks for multiple data items with REQUEST=UNLOCK_CASTOUT. To reduce processing overhead, you might want to cast out a number of data items, then free all of the cast-out locks with one invocation of IXLCACHE REQUEST=UNLOCK_CASTOUT.

For more information about unlocking cast-out locks, see UNLOCK_CASTOUT: Releasing Cast-Out Locks and UNLOCK_CO_NAME: Releasing a Single Cast-Out Lock.