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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 9. Data Sharing

An IMS system includes a set of databases that are potentially available to all the declared application programs. Access to an individual database is a characteristic that you define in a program’s program specification block (PSB). Data-sharing support enables application programs in separate IMS systems to have concurrent access to the same set of databases. IMS systems use lock management to ensure that database changes at the segment level that originate from one program are fully committed before other programs can access that segment’s data.

IMS systems can share data in a sysplex environment and in a non-sysplex environment:

Sysplex data sharing is data sharing between IMS systems on multiple z/OS images. A coupling ...

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