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Unit 1: Database System Architecture

20212m

The relational model feature is that there

  • (i) is no need for primary key data
    (ii) is much more data independence than some other database models
    (iii) are explicit relationships among records
    (iv) are tables with many dimensions
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Answer: (ii) is much more data independence than some other database models

Explanation: The relational model provides high data independence. Data is stored in tables and logical/physical independence is better than hierarchical/network models where explicit pointers relate records. Primary keys are required and relationships are implicit via keys, not explicit pointers. Tables are two-dimensional, not many dimensions.

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