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. 13. The method of claim 6 , wherein comparing the first and second query distributions comprises: matching the first and second queries by comparing their volumes per unit time.