In a registration database, ross has tables for student, professor, classroom, class, class-hour. since his campus has about 12,000 students, when he runs queries about what student is in what class, taught by what professor in what classroom at which hour, the dbms software will have to perform many

Urban growth invariably feeds increased commercialization and industrialization. it requires continually expanding land areas. when urbanization rates are high, and countries do not have the institutional and managerial capacities or economic wherewithal to manage such rapid growths, they exert intense pressure on the types and nature of the resulting settlements. they contribute to the development of overcrowded slums and shanty towns without adequate essential services and necessary infrastructure.-by asit k. biswas and cecilia tortajada