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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