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Repository data sets

When a process is not executing under the control of the CICS business transaction services domain, its state and the states of its constituent activities are preserved by being written to a VSAM data set known as a repository.

To use BTS, you must define at least one BTS repository data set to MVS. You may decide to define more than one, assigning a different set of process-types to each. One reason for doing this might be storage efficiency, for example, if some of your process-types tend to produce longer records than others.

If you operate BTS in a sysplex, several CICS regions may share access to one or more repository data sets. This enables requests for the processes and activities stored on the data sets to be routed across the participating regions. As you migrate your CICS releases, you may therefore still share older versions of repository data sets. The expectation is that you would define and use different repository data sets as and when you wanted to assign different sets of process-types, rather than just because a CICS migration has occurred.

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