Unloaded copies of the databases that are merged are defined in the JCL with DD statements named SARMERGn, where n specifies a number from 1 to 9. The first unloaded database that is merged is defined with the DD statement SARMERG1, the second with DD statement SARMERG2, and so on. When only one database is merged, the operation functions as a reset operation to reset generation and tape sequence numbers.
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