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A _________ on the attribute A of relation r consists of one bitmap for each value that A can take

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A _________ on the attribute A of relation r consists of one bitmap for each value that A can take

(a) Bitmap array

(b) Bitmap index

(c) Bitmap excess

(d) Bitmap

I got this question in an international level competition.

The query is from Bitmap Indices topic in portion Indexing and Hashing of RDBMS

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Right option is (b) Bitmap index

For explanation: A bitmap index on the attribute A of relation r consists of one bitmap for each value that A can take. Each bitmap contains as many bits as the number of records in the relation.

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