Your question is Data Integrity in Mainframe Batches. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
How do you ensure data integrity when performing batch updates on a Mainframe?
Discuss transaction boundaries, restartability, validation, reconciliation, recovery, and protection against duplicate or partial updates. Address a z/OS environment using common batch technologies such as JCL, COBOL, DB2, or VSAM, and explain how you would prove that the update completed correctly.