Question

Explain deference between physical and logical data independence.

Answer 1

Physical data independence	Logical data independence
Modifies the scheme followed at the physical level without affecting the scheme followed at the conceptual level.	Modifies the conceptual scheme without causing any changes in the schemes followed at view levels.
Less difficult to achieve.	More difficult to achieve because the
Application programs are not heavily dependent on the physical structure of the database.	Application programs are heavily dependent on the logical structure of the database.