RACF® allows DFSMS to establish defaults for the constructs known as storage class, management class, data class, and data application on the RACF database. These constructs are stored by field name in the DFP segment of the USER and GROUP profiles.

The DFP field, RESOWNER, contains the user ID or group name of the owner of the data set, rather than the owner of the profile. In general, the data set profile contains a specified RESOWNER field when the data set resource owner differs from the data set profile's high-level (first) qualifier.

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 DFP segment.

You should issue a SETROPTS RACLIST command with the STORCLAS and MGMTCLAS classes to improve performance.

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