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Difference between physical and logical data independence.

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Plz explain the difference between physical and logical data independence.
asked Jun 12, 2013 in Computer Engineering by Saba Khan  

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Physical data independence is the ability to modify the physical scheme without making it necessary to rewrite application programs. Such modifications include changing fromunblocked to blocked record storage, or from sequential to random access files.
 
Logical data independence is the ability to modify the conceptual scheme without making it necessary to rewrite application programs. Such a modification might be adding a field to a record; an application program’s view hides this change from the program.
                      
 
answered Jun 13, 2013 by sheebaaltaf  

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