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What Do You Understand By Data Independence?

Answer»

Data independence tells about the independence of the data INSIDE the application. It usually deals with the STORAGE structure and represents the ability to modify the schema definition. It doesn’t affect the schema definition which is being written on the HIGHER level. There are TWO types of data independence:

  1. Physical data independence: it ALLOW the modification to be done in physical level and doesn’t affect the logical level.
  2. Logical data independence: it allow the modification to be done at logical level and affects the view level.

NOTE: Logical Data Independence is more difficult to achieve.

Data independence tells about the independence of the data inside the application. It usually deals with the storage structure and represents the ability to modify the schema definition. It doesn’t affect the schema definition which is being written on the higher level. There are two types of data independence:

NOTE: Logical Data Independence is more difficult to achieve.


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