What Physical Data Independence?
Physical Data Independence :-
It is the capacity to change the internal schema without having to change conceptual or external schema. Changes to the internal schema may be needed because some physical file had to be recognized, for example, by creating additional access structures to improve the performance of retrievals or update
It is the capacity to change the internal schema without having to change conceptual or external schema. Changes to the internal schema may be needed because some physical file had to be recognized, for example, by creating additional access structures to improve the performance of retrievals or update
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