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Search algorithms that use an index are referred to as

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Search algorithms that use an index are referred to as (a) Index Search (b) Linear search (c) File scan (d) Access paths This question was addressed to me in an international level competition. I'd like to ask this question from Selection Operation topic in section Query Processing Techniques of Database Management Select the correct answer from above options Interview Questions and Answers, Database Interview Questions and Answers for Freshers and Experience

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Correct answer is (a) Index Search To explain: Selection predicates are used to guide in the choice of the index to use in processing the query.

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