Working with Call Statistics

Use

You can use the buffer monitor to help you decide which buffers to tune.

Procedure

To display the call statistics, from the initial screen, choose Administration → System administration → Monitor → Performance → Setup/Buffers → Buffers → Detail analysis menu → Call statistics. On the next screen, make a selection and choose Enter.
Sort the display according to the data records called. Position the cursor on an entry in the column Calls (under DB activity) and choose Sort.

Result

The Changes column indicates which tables are being changed most frequently. You can generally consider buffering tables with many read accesses but with fewer than 100 changes per day.

The system displays the number of changes made since the system was started. By checking the dates at the top of the screen, you can determine the number of days that have elapsed since system startup.

Therefore: Changes per day = Total changes ¸ Total number of days in the selected time period

You should also consider the table type. Only buffer tables of type TRANSP or Pool are important here. Ignore those that are of type System as these tables should not be changed.