Physical Data Independence Physical Data Independence-the ability to modify the physical schema without changing the logical schema Applications depend on the logical schema In general,the interfaces between the various levels and components should be well defined so that changes in some parts do not seriously influence others. Database System Concepts-7th Edition 1.16 @Silberschatz,Korth and SudarshanDatabase System Concepts - 7 1.16 ©Silberschatz, Korth and Sudarshan th Edition Physical Data Independence ▪ Physical Data Independence – the ability to modify the physical schema without changing the logical schema • Applications depend on the logical schema • In general, the interfaces between the various levels and components should be well defined so that changes in some parts do not seriously influence others