Using CA Hyper-Buf › Dynamic Buffering Control Statements

Dynamic Buffering Control Statements

You can exert as much or as little control as you wish over the buffering process. You exercise this control at initialization time through control statements supplied to GVBDBFON, the CA Hyper-Buf initialization program, and by refreshing the constraints using the GVBREFR utility after CA Hyper-Buf is initialized on your system. You can also exercise this same control using the TSO interface.

You control the dynamic buffering process by placing control statements in the GVBDBFON or GVBREFR SYSIN stream. These controls allow you to select both specific and generic instances of OPENs and to affect the number of buffers selected at OPEN time by dynamic buffering. You can specify exact numbers of buffers, set limits that CA Hyper-Buf will not exceed, or exempt entirely selected jobs clusters, and programs from the dynamic buffering process. The amount of control you exert at each and every level is up to you, and is optional.

There are several types of control statements available. These types are SYSTEM_DEFAULTS, MODE group controls, LEVEL selectors, and CONSTRAINT specifications. This section of the manual supplies an overview of the constraint capabilities, and the details of the SYSTEM_DEFAULTS, MODE control, and LEVEL selectors. The constraints are described in detail in the next chapter.