When you update a RACF® database, IRRMIN00 adds the new templates to the database, writes the segment table, and updates the pointers and counts in the ICB to reflect the new templates. The utility does not alter the index blocks and profiles, or update the in-storage copy of the templates that RACF uses.

When you specify PARM=UPDATE, IRRMIN00 compares the level of the templates in the RACF database (which it detemines from the ICB) with the level of the templates in the CSECT IRRTEMP2. If IRRTEMP2 has a template level less than or equal to that in the ICB, IRRMIN00 issues a message to SYSPRINT and does not update the database. This behavior prevents you from accidentally installing a down-level version of the templates.

If you are updating the active RACF database, IRRMIN00 obtains an exclusive RESERVE on the database. If RACF is running in data sharing mode, an ENQ is issued instead of the RESERVE. The RESERVE or ENQ should be of short duration and should not interfere with other work active on the system. In read-only mode, RACF does not allow IRRMIN00 to be run against an active database.