hi @aakulov  Thanks for your reply. I think I was not able to clearly explain the problem. Let's take an example, suppose I have 1M records for phone numbers. Here the frequency of phone number P1 is x and P2 is 2x (2 times x). My observation is that time taken in fetching same number of rows, let's say 10k, for both phone numbers is different  (QTime is more in case of P2) even if I don't use any sort parameter. I want the QTime to be same if number of rows in both the cases is same. ... View more