6. The method of claim 5 , wherein the second query distribution comprises a volume of the instances of the second query per unit of time over the time period.
6. The method of claim 5 , wherein the second query distribution comprises a volume of the instances of the second query per unit of time over the time period. 9. The method of claim 6 , wherein comparing the first and second query distributions comprises: comparing the volume of the instances of the first query per unit of time with the volume of the instances of the second query per unit of time over the time period.