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What is the purpose of the index in sql server?

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What is the purpose of the index in sql server? (a) To enhance the query performance (b) To provide an index to a record (c) To perform fast searches (d) All of the mentioned I had been asked this question by my college professor while I was bunking the class. Asked question is from Index Definition in SQL topic in chapter Indexing and Hashing 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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The correct answer is (d) All of the mentioned The best explanation: A database index is a data structure that improves the speed of data retrieval operations on a database table at the cost of additional writes.

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