Interpreting ISC and IRC attach time entry statistics

ISC and IRC signon activity and ISC persistent verification (PV) activity give information about the best settings for your USRDELAY and PVDELAY system initialization parameters.

If the number of entries reused in signon activity is low, and the entries timed out value for signon activity is high, increase the value of the USRDELAY system initialization parameter. The average reuse time between entries value gives some indication of the time that you might want to set for the USRDELAY system initialization parameter.

Review your USRDELAY system initialization parameter, because with z/OS® 1.11 and later, CICS is notified immediately if RACF® profile changes occur.

ISC persistent verification (PV) activity. If the number of entries reused in the PV activity is low, and the entries timed out value is high, increase the PVDELAY system initialization parameter. The average reuse time between entries value gives some indication of the time that you might want to set for the PVDELAY system initialization parameter.

If a lot of signed on or PV entries are timed out, and not many are reused, your performance might be degraded because of the need to make calls to an external security manager, such as RACF, for security checking.