11.17 IBM i Authority Checking
IBM i authority checking can impact system performance. The IBM i performance reports have a section that lists "exceptions".
In this list are "security" or "authority" exceptions. The rate at which these exceptions occur and impact system performance is shown in the following figure:
Authority Exceptions Percentage of Total CPU Cycles consumed
Rate per Second B10 B20 B30 B40 B50 B60 B70
10 6 3 5 3 2 1 1
25 15 9 12 8 5 3 2
50 29 17 25 16 10 6 4
100 58 34 49 32 20 12 9
200 69 99 63 39 24 17
300 95 59 36 27
400 78 48 35
500 98 60 44
600 71 53
700 83 62
800 95 71
900 80
1000 89
If high exception rates are found, steps can be taken to alter IBM i security settings to reduce the number of exceptions that are occurring.