WHILE THE QUERY IS RUNNING, IN YOUR SECOND SESSION REISSUE THE QUERY IN STEP 16 A FEW TIMES, AND YOU WILL SEE THE CLERK SESSION BEING DOWNGRADED FROM HIGH TO MEDIUM AFTER FIVE SECONDS, AND THEN TO LOW AFTER A FURTHER TEN SECONDS

18. While the query is running, in your second session reissue the query in Step 16 a few times, and you will see the CLERK session being downgraded from HIGH to MEDIUM after five seconds, and then to LOW after a further ten seconds.