Glossary of mainframe terms and expressions
A catalog describes data set attributes and indicates the volumes on which a data set is located. When a data set is cataloged, it can be referred to by name without the user needing to specify where the data set is stored. Data sets can be cataloged, uncataloged, or recataloged. […]
Batch processing is a method of running a program or a series of programs in which one or more records (a batch) are processed with little or no action from the user or operator. A program that reads a large file and generates a report, for example, is considered to […]
z/OS initialization, or an Initial Program Load (IPL), is the act of loading a copy of the operating system from disk into the processor’s real storage and executing it. This process essentially consists of: – System and storage initialization, including the creation of system component address spaces – Master scheduler […]
Swapping is the process of transferring all of the pages of an address space between real storage and auxiliary storage. A swapped-in address space is active; having pages in real storage frames and pages in auxiliary storage slots. A swapped-out address space is inactive; the address space resides on auxiliary […]
When a program is selected for execution, the system brings it into virtual storage, divides it into pages of 4 kilobytes (4K), and transfers the pages into real storage for execution. To the programmer, the entire program appears to occupy contiguous space in storage at all times. Actually, not all […]
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