The RACF® database includes a TSO segment where TSO can store TSO user logon information. Thus, TSO has an alternative to storing TSO user information in the UADS data set.

Using a combination of the FIELD class and the command processors, the RACF administrator can decide which fields users can define and update in their TSO segment.

For further information, see z/OS Security Server RACF Command Language Reference and z/OS Security Server RACF Security Administrator's Guide.