VTAM® uses the value of the ASRCVLM operand coded on the APPL definition statement in calculating the constraint and critical levels for application program data space. Selecting a value for the ASRCVLM operand should reflect the high-usage periods of the data space storage.

To determine current usage value for the application program data space, issue a DISPLAY ID operator command, specifying the application program name. Message IST1633I contains the value specified for the ASRCVLM operand and message IST1634I contains the address space usage.