1. A computer implemented method to track a plurality of queries and a plurality of result sets of entities, the method comprising: associating a first query of said plurality of queries with a first result set of said plurality of result sets in a first tuple; associating a second query of said plurality of queries with a second result set of said plurality of result sets in a second tuple; retaining said first tuple and said second tuple in a data structure; and arranging said first tuple and said second tuple in said data structure according to an order of execution of said first query and said second query.