When you run the database unload utility, one of the following parameters must be specified: NOLOCKINPUT, LOCKINPUT, or UNLOCKINPUT. You can abbreviate the parameter to N, L, or U, respectively. For the least impact to system performance, use a copy of your RACF® database as input and specify the NOLOCKINPUT parameter.

When your system is RACF is enabled for sysplex communication and RACF is running in read-only mode, the only parameter allowed for IRRDBU00 is NOLOCKINPUT.

Using the backup copy of the RACF database is allowed. Using an active copy of the RACF database can affect system performance and it is not recommended.