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Question

What is a disadvantage of bitmapped indexes?

a.

They require less space compared to B-Tree indexes

b.

They are suitable for high-selectivity columns

c.

They do not need table access after index access

d.

They need reconstruction when new values are introduced for the indexed columns

Answer: (d).They need reconstruction when new values are introduced for the indexed columns Explanation:A disadvantage of bitmapped indexes is that they need reconstruction when new values are introduced for the indexed columns.

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Q. What is a disadvantage of bitmapped indexes?

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