ISRO | ISRO CS 2018 | Question 74

Immunity of the external schemas (or application programs) to changes in the conceptual schema is referred to as:
(A) Physical Data Independence
(B) Logical Data Independence
(C) Both (a) and (b)
(D) None of the above


Answer: (B)

Explanation: Immunity is when data at one layer is changed, it does not affect the data at another level.
Physical data independence:- if changes are made in the physical storage of schema then it will not affect the logical schema of the database.
Logical data independence:- if any changes are made in the conceptual schema then it will not affect external schema or the view level of the database.

So, option (B) is correct.

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