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Bitmaps can be combined with regular B+-tree indices for relations where a few attribute values are extremely common, and other values also occur, but much less frequently.

(a) Bitmap, B-tree

(b) Bitmap, B+tree

(c) B-tree, Bitmap

(d) B+tree, Bitmap

The question was posed to me during a job interview.

Question is taken from Bitmap Indices in section 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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Correct option is (b) Bitmap, B+tree

To explain: Bitmaps are combined and stored in a B+ tree.

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