Discussion
Which one is the correct statement? Logical data independence provides the following without changing application programs: (i) Changes in access methods. (ii) Adding new entities in the database. (iii) Splitting an existing record into two or more records. (iv) Changing the storage structure of the database.
Answer: D
Correct answer: (ii) and (iii)
Logical data independence protects programs from changes to the logical structure: adding an entity or splitting a record leaves existing programs working, because they still see the fields they asked for. Changing access methods or the storage structure is a change at the physical level, and immunity to those is physical data independence.
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