Using SETROPTS INITSTATS and SETROPTS STATISTICS

An installation can record two types of RACF® statistics. One is INITSTATS, which records user logon information; the other is STATISTICS, which records access to resources in specific classes that are protected by discrete profiles. There are several initial guidelines:

When a new RACF database is initialized, the default is INITSTATS on.
Guideline: Use INITSTATS, because it allows you to use other options to provide additional security at logon.
When a new RACF database is initialized, the default is STATISTICS off for all classes.
Guideline: Keep STATISTICS off until your installation has had an opportunity to evaluate the need for STATISTICS versus the potential impact on performance.

For details, see the SETROPTS command in z/OS Security Server RACF Command Language Reference.

Note: If you are sharing a database and are using in-storage data blocks, statistical information might not be accurate.