Number of Statistics Sets

When the value of this option is greater than 0 but less than 999, BCF retains the statistics sets for this job step until the number of sets is equal to this maximum value. The next time the job step executes, BCF deletes the oldest statistics set and saves the new set so that the number of statistics sets does not exceed this maximum value. If the old statistics set was created less than 24 hours before the current job step execution, BCF postpones the deletion. The next time the job step executes after 24 hours have elapsed, BCF deletes the oldest set or sets.

For consistency, you should set this option at the global or system level. If you set it at the job step level or execution level, confusing results are possible. For example, if this option is set to 6 at the global level and to 3 for a job step, some statistics sets will probably be deleted unexpectedly every time the job step is executed.