If you plan to use the block update (BLKUPD) command to update your database, you might want to get a better understanding of what your current database looks like.

The database unload utility (IRRDBU00) reads every profile as it unloads your RACF® database to a sequential file. This can uncover problems in your database that you find only when reading the profile.

For more information on using the utility, see z/OS Security Server RACF Macros and Interfaces and z/OS Security Server RACF Security Administrator's Guide.