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What is data independence? Explain the difference between physical and logical data independence. |
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Answer» Data Independence – It is the ability to modify the scheme definition in one level without affecting the scheme definition at the next higher level. (a) Physical Data Independence – It is the ability to modify the physical scheme without causing application programs to be rewritten. (b) Logical Data Independence – It is the ability to modify the logical scheme without causing application programs to be rewritten. |
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