APAR OA14351 provides support for choosing the type of restart token algorithm the system is to use when restarting a READ_COCLASS request that ends prematurely. The NORMAL restart token algorithm operates as it always has. Because of unrelated processing that may have taken place before the user's restart processing begins, duplicate entries that match the user's filtering criteria may be returned and other entries may be missed entirely. The ENHANCED restart token algorithm eliminates the chance of entries that match the user's filtering criteria being missed, but there is still the possibility that duplicate entries may be returned.

To determine whether the coupling facility in which the cache structure resides is capable of using the enhanced restart token algorithm, you must examine field CaaEnhancedRtAlgPresent in IXLYCAA, the Cache Answer Area. A value of 1 in this field indicates that the enhanced restart token support is present; a value of 0 indicates that the support is not present.