Data Independence |Introduction to Database management system
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DEFINITION-
Data independence means upper layers are unaffected by any change in the lower layers.
TYPES OF DATA INDEPENDENCE-
There are 2 types of data independence.
1. LOGICAL DATA INDEPENDENCE
2. PHYSICAL DATA INDEPENDENCE
1. LOGICAL DATA INDEPENDENCE- If conceptual level changes no effect on external level.
2. PHYSICAL DATA INDEPENDENCE-If Internal level changes no effect on conceptual level.
(3 LEVEL ARCHITECTURE)
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