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In a __________ index, an index entry appears for only some of the search-key values.

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In a __________ index, an index entry appears for only some of the search-key values.

(a) Dense

(b) Sparse

(c) Straight

(d) Continuous

The question was asked in an online quiz.

This intriguing question originated from Ordered Indices in portion Indexing and Hashing of Database Management

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Correct option is (a) Dense

Explanation: Sparse indices can be used only if the relation is stored in sorted order of the search key, that is if the index is a clustering index.

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