Designing the IMS system

Before you can use the Information Management System Transaction Manager (IMS TM) and the Information Management System Database Manager (IMS DB), you must define the elements and functions that make up an IMS system. These elements and functions include databases, application programs, terminals, buffer pool sizes, security options, and more.

The parameters that are associated with the IMS system configuration macros create the integrity of the IMS online system. These parameters specify resources that are available for system checkpoints and program isolation. The allocation of system data sets and control program storage depends upon the expected processing load and the strategy for recovery of the online IMS system.