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The additional space occupied by an index structure is called as _________

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The additional space occupied by an index structure is called as _________

(a) Access modes

(b) Space types

(c) Access time

(d) Space overhead

This question was addressed to me in my homework.

This interesting question is from Ordered Indices topic in section Indexing and Hashing of RDBMS

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Right choice is (d) Space overhead

The explanation is: The additional space occupied by an index structure is called as space overhead. It is usually a worthwhile sacrifice to achieve improved performance.

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