Multiple choice technology mainframe

What is the purpose of the DD KEYLEN parameter?

  1. Specify the length of a data set key in bytes

  2. Override the key length of an SMS defined VSAM dataset

  3. Override the key length specified in the dataset label

  4. All of the above
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D Correct answer
Explanation

The DD KEYLEN parameter serves multiple purposes: it can specify key length for new datasets, override SMS-defined VSAM dataset key lengths, or override key lengths from the dataset label. Since all these uses are valid, 'All of the above' is correct. This parameter gives programmers flexibility in key field specification.

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