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In a data center of any size, it is not easy to maintain effective controls on the various programs that reside on the system. The production programs and systems support programs used at a data center are of particular concern to auditors and security experts.
Before a program becomes executable by the system, the following steps must occur. First, a program is written in one of several available computer languages. Then, the appropriate language translator (such as the COBOL compiler) formats the program into a machine language object module. The linkage editor then combines the object modules with other object modules from other programs or subroutines into a single, machine‑readable load module.
When the link‑edit process is complete, these executable programs are kept in partitioned data sets (PDSs) or partitioned data sets extended (PDSEs), both commonly referred to as load libraries. The directory entries for the members of a load library contain information about each module stored in the library. This information includes whether a program is APF‑authorized, its link‑edit date, load module size, and if AMASPZAP (superzap) was used on the module.
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