In my IL script testing , I concatenate the data from qvd and data pulled from sql db. I noticed that record count is not in sync between full load and incremental load. I wondered does the qvd stores duplicate record or not.
Now i got clarified that in full load qvd contains all rows though it is duplicate. But in incremental load duplicates are eliminated as i have used CONCATENATE, so qvd contains less rows than full load qvd.