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ABCs of z/OS System Programming Volume 8 by Peter Hilger, Paul Rogers

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Common problem types
z/OS can process large amounts of work efficiently because it keeps track of storage in a way that makes its storage capacity seem greater than it is. It’s a complex system made up of many components, similar to the human body. And, like the human body, z/OS can experience problems that need to be diagnosed and corrected.
The following are examples of problems you might encounter while running z/OS:
An abnormal end occurs in processing, known as an abend.
 – Application program abends
 – System program abends
A job remains ...

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