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Indices with two or more levels are called as?

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in RDBMS by (118k points)
Indices with two or more levels are called as?

(a) Multiple Indices

(b) Multilevel indices

(c) Bi- tri- Indices

(d) None of the mentioned

I have been asked this question during an interview for a job.

My question is based upon Ordered Indices topic in division Indexing and Hashing of RDBMS

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The correct answer is (b) Multilevel indices

Easiest explanation: Indices with two or more levels are called as multilevel indices. They require significantly few I/O operations than searching using binary search.

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