If a file is defined as a user-maintained data table (UMT), the source data set and the data table are treated by CICS® as separate entities. After a user-maintained data table has been loaded, it is independent of its source data set; the source data set is not updated when the data table is updated. Thus, a user-maintained data table is particularly suited to applications that make frequent updates to data of a transitory nature.
If the data table and source data set are updated separately, by defining them as different files, changes to one are not automatically reflected in the other.
This chapter discusses the User-maintained data table under:
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