Data definition override statements
Data definition (DD) override statements provide a simple means for specifying inclusion or exclusion and setting options in the JCL without creating a data policy definition.
DD override statements are particularly useful for short-term testing and impromptu changes.
The DD override statements are applied at the job step level and are position sensitive. If they appear as the first statements after the EXEC statement (or STEPLIB), they apply to all DDs within the job step. If they appear after a particular DD, they apply to that DD only.
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