What is the purpose of DD * statement?
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Begins an input data prompt at the system console
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Begins an in-stream datase
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Marks the end of a command stream
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Includes all datasets within a naming pattern
DD * statement begins an in-stream dataset, allowing data to be included directly within the job stream rather than from an external dataset. The data follows immediately after the DD * line and ends with /* delimiter. This is different from DD DATA which prompts for console input. Option B correctly identifies this as beginning an in-stream dataset.
To answer this question, you need to understand the purpose of the DD * statement in a mainframe environment.
Option A) Begins an input data prompt at the system console - This option is incorrect. The DD * statement is not used for input data prompts at the system console.
Option B) Begins an in-stream dataset - This option is correct. The DD * statement is used to indicate that the dataset is included within the JCL (Job Control Language) itself, rather than being a separate physical dataset. It allows the program to read data directly from the JCL.
Option C) Marks the end of a command stream - This option is incorrect. The DD * statement is not used to mark the end of a command stream.
Option D) Includes all datasets within a naming pattern - This option is incorrect. The DD * statement is not used to include all datasets within a naming pattern.
The correct answer is B) Begins an in-stream dataset. This option is correct because the DD * statement is used to indicate that the dataset is included within the JCL itself.