Computer Science · Database Management Systems

Which of the following statements accurately describe the operational differences between Logical and Physical Data Independence? A. Logical Data Independence is the ability to modify the conceptual schema without affecting external schemas or application programs. B. Changing a file organisation from sequential to indexed is an example of Logical Data Independence. C. Physical Data Independence is generally easier to achieve because the conceptual schema is already abstracted away from physical storage. D. Logical Data Independence is considered harder to achieve because application programs often contain embedded queries referencing specific table or column names. Choose the most appropriate answer from the options given below: