The files of cobol which are not needed to compiled, because those files are not changed only some files are changed then we have to make them logically unavailable to the compilation. This can be done by Dummy parameter
this is system defied parameter which can be used to create/ delete datasets dynamically by the o/s i.e this data set is available only during the program execution. Dummy must be specified in the DD operand or dsn=nullfile can be used.
use |: to test the cobol program/ to improve program performance at the time of testing . to simplify the testing process.
Any number of dummy parameters can be used as per the requirement.
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