You can RACF-protect data sets that have names consisting of only a single qualifier (that is, single-level names). To get RACF® protection for single-qualifier names, issue the SETROPTS command with the PREFIX operand to activate the facility and define a prefix. If you use the SETROPTS command with the PREFIX operand to define a prefix (high-level qualifier), RACF internally modifies single-qualifier names by adding the high-level qualifier when it processes requests for the data set. The prefix must be an existing group name and cannot be the name used as the high-level qualifier of any actual data sets or data set profiles in the system. The following example shows how to RACF-protect data sets with single-qualifier names with the prefix RAC1LVL:

SETROPTS PREFIX(RAC1LVL)