Constraint control statements allow you to control the buffering process. You can specify very restrictive rules, which limit the effects of dynamic buffering, or you can allow dynamic buffering a free hand in determining the number of buffers to allocate. You can be conservative with some level selectors and liberal with others. The amount of control exercised is entirely up to you. You can even choose not to code any constraints and allow the SYSTEM_DEFAULTS to prevail for every VSAM OPEN.
This section contains the following topics:
Specifying Constraint Control Statements
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