Structure
In the z/OS environment, a CICS installation comprises one or more regions (generally referred to as a "CICS Region"), spread across one or more z/OS system images. Although it processes interactive transactions, each CICS region may be started as a batch processing|batch address space with standard JCL statements: it's a job that runs indefinitely. Alternatively, each CICS region may be started as a started task. Whether a batch job or a started task, CICS regions may run for days, weeks, or even months before shutting down for maintenance (MVS or CICS).
Installations are divided into multiple address spaces for a wide variety of reasons, such as:
- application separation,
- function separation,
- avoiding the workload capacity limitations of a single region, or address space.
A typical installation consists of a number of distinct applications. Each application usually has its own "Terminal-Owning Region" (TOR) and one or more "Application-Owning Regions" (AORs), though other topologies are possible. For example, the AORs might not perform File I/O. Instead there would be "File-Owning Regions" (FORs) that performed the File I/O on behalf of transactions in the AOR.
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