Use of environment records
Various RMGR functions use the information in environment records to form groups of recoverable objects and to generate and build the JCL for processing groups and objects.
If you are in a data-sharing environment and have specified the SHAREGROUP keyword in the RMGR startup SYSIN statements, RMGR uses the sharegroup environment record to identify the IMS data sets. If you are not in a data-sharing environment, RMGR uses the IMS environment record to identify all IMS data sets.
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