What is physical data independence and why is it important?
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The ability to modify a schema definition in one level without affecting a schema definition in the next higher level is called Data Independence.
It is independence between the programs and the data.
In the conventional data processing application programs, any change of data structure or format would require appropriate changes to the application programs. If major changes were to be made to the data, the application programs may need to be rewritten.
In a database system, the DBMS provides the interface between the application programs and the data.
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