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)
This article provides a clear and concise explanation of data independence and its importance in Database Management Systems. The distinction between logical and physical data independence is presented in a simple way, making the concept easy to understand. The connection with the three-level database architecture also helps clarify how changes at one level can be managed without affecting other levels, highlighting the flexibility, maintainability, and efficiency that data independence brings to modern database systems.
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