Within each mode control group, you can specify as many level selectors as you wish. Level selectors 'belong' to the previous MODE control statement or the DEFAULTMODE control statement if no previous MODE statements exist in the input stream. All of the level controls that belong to a particular MODE card are called a mode control group.
The level controls that you can specify are SMS class, CLUSTER, JOB, PROGRAM, and PROGRAM/DDNAME pairs. Any OPEN that matches any LEVEL selector(s) included within an EXCLUDE mode control group is exempt from dynamic buffering.
At OPEN time, the intercept routine initializes a constraint table with the system default values. Then each of the control levels is searched for any matches (job level searched using current job name, and so forth). The constraints associated with each matching control level entry are merged into the constraint table, which overlays any data that may have already existed for that particular constraint (like maximum buffer space).
After all of the levels have been searched, the resulting constraint table, called the composite constraint table, is passed to the dynamic buffering calculation routines. This composite table governs the calculation of buffers for this OPEN.
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