Which of the following is dense index?
(A) Primary index
(B) Clusters index
(C) Secondary index
(D) Secondary non key index
Explanation: Dense index: In a dense index, an index entry appears for every search-key value in the ﬁle. In a dense clustering index, the index record contains the search-key value and a pointer to the ﬁrst data record with that search-key value. It is also a secondary index.
Option (C) is correct.
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