Sanjay on March 17, 2009

What is the difference between logical data independence and physical..?

What is the difference between logical data independence and physical
data independence? (CoreJava)

Asked by: Sanjay
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17, Mar/09
Logical Data Independence - meaning immunity of external schemas to
changeds in conceptual schema. Physical Data Independence - meaning
immunity of conceptual schema to changes in the internal schema.

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12, Apr/13
Logical Data Independence: Logical data independence is the ability to modify the conceptual schema without having alteration in external schemas or application programs. Alterations in the conceptual schema may include addition or deletion of fresh entities, attributes or relationships and should be possible without having alteration to existing external schemas or having to rewrite application programs.
Physical Data Independence: Physical data independence is the ability to modify the inner schema without having alteration to the conceptual schemas or application programs. Alteration in the internal schema might include. * Using new storage devices. * Using different data structures. * Switching from one access method to another. * Using different file organizations or storage structures. * Modifying indexes.

Reference: http://wiki.answers.com/Q/Difference_between_logical_data_indepence_and_physical_data

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