A SET_RECLVCTR request allows you to define, activate, or deactivate a reclaiming vector (RECLVCTR) for a specified storage class (STGCLASS). Once defined, the reclaiming vector specifies how many reclaims are allowed against each storage class defined in the structure for requests targeted to the storage class to which the reclaim vector pertains. The reclaiming vector is associated with the specified storage class (STGCLASS) and will be used to satisfy subsequent IXLCACHE requests that require resources in that storage class.

You can also specify the number of passes (REPEAT) through the reclaim vector before reclaim processing reverts to the default reclaim algorithm. (By default, the system attempts to reclaim the least recently used resources belonging to data items in the target storage class.) The reclaiming vector you specify remains active for the specified number of passes, or until it is deactivated. Specifying a zero on the REPEAT parameter deactivates the reclaiming vector.

When the system processes an IXLALTER request for a cache structure, all active reclaim vectors associated with all storage classes for the structure are deactivated. While the alter process continues, the system rejects any attempt to activate a reclaim vector. When the alter process completes, the system does not automatically reactivate any reclaim vectors that were deactivated when the structure alter was initiated. It is the responsibility of the user to activate any new or still-needed reclaim vectors.