The direct access space that is needed for a RACF® database depends mainly on the number of users, groups, user-group connections, and resource profiles that are defined to RACF. Other factors that might affect the amount of space that is required for the database include:

• The length of the names of the entities that are defined to RACF
• Activating the RACGLIST class
• Activating the CACHECLS class
• How efficiently the space in the RACF database is used