Considerations prior to and When Using the BLKUPD Utility

The following considerations apply to the use of the block update utility (BLKUPD):

• In general, you should use this utility only when directed to by the IBM® support center.
• Do not use BLKUPD during hours of peak activity on the active RACF® database as the command places reserves on the database.
• Before using BLKUPD, try to correct the error by using the RACF commands.
• Before using BLKUPD, make a copy of the RACF database. Use BLKUPD on the copy. IBM may be able to use the copy for further diagnosis.
• Run IRRUT200 before beginning to use BLKUPD. The output may be useful in identifying the damaged portion of the database.
• Document all changes made for future reference and diagnosis.
• RVARY the “repaired” database online and test your fix.
• Once the fix has been verified, apply the fix to the “real” database and RVARY this database ONLINE.
• If a profile is in question, delete the index entry that points to the profile, rather than trying to repair the profile itself. Use the RACF command processor to add the profile and index entry.
• Do not use BLKUPD against the BAMs. Use the IRRUT400 utility instead.
• If a RACF database is RACF-protected, you must have at least UPDATE authority to the database.