RACF® processing of user verification requests might be improved by using virtual lookaside facility (VLF). During verification, RACF can save ACEEs by using VLF, and retrieve them on subsequent verification calls for the same user.

Performance improves through pathlength reduction and elimination of I/O to the RACF database. If multiple requests from repetitive tasks are made (for example, when batch jobs are going through the system), there is likely to be a match in VLF for the ACEE being built.

See also Removing information from VLF.

For RACF to begin saving and retrieving ACEEs, you must define the IRRACEE class to VLF. For more information, see ACEEs and VLF considerations. For information on VLF, see z/OS MVS Programming: Authorized Assembler Services Guide.