During daily operation, you will probably add new users to TSO/E, delete users, or change information about users. After a number of these changes, available space in the UADS and broadcast data sets may become fragmented. To reduce fragmentation, you can reformat and synchronize these data sets. If the data sets need more space, you can reallocate them. For information about maintaining these data sets, see Working with the UADS and broadcast data set.

If you have RACF® installed, you can define your TSO/E user information in the RACF data base. For more information, see Maintaining the UADS, RACF data base, and broadcast data set. If you use the RACF data base, you must synchronize the RACF data base with the broadcast data set.