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An Introduction to IMS: Your Complete Guide to IBM Information Management System by Steve Nathan, Sandy Sherrill, Rick Long, Moira McFadden Lanyi, Margaret Wilson, Kenny Blackman, John Butterweck, Diane Goff, Barbara Klein

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Chapter 2. Overview of the IMS Product

IMS consists of three components:

IMS Database Manager (IMS DB)

IMS Transaction Manager (IMS TM)

• A set of system services that provide common services to IMS DB and IMS TM

Often referred to collectively as IMS DB/DC (DC stems from the original name for the IMS Transaction Manager: Data Communications), these components comprise a complete online transaction and database processing environment that provides continuous availability and data integrity. IMS delivers accurate, consistent, timely, and critical information to application programs, which in turn deliver the information to many end users and programs.

IMS has been developed to provide an environment for applications that require very high levels ...

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