Which two statements are true about a bitmap index?

Which two statements are true about a bitmap index? (Choose two.)

Which two statements are true about a bitmap index? (Choose two.)

A.
It is recommended for the columns that have unique values.

B.
It can be converted to a B-tree index by using the ALTER INDEX command.

C.
It has a bitmap segment for each distinct value in the key column, containing a string of bits in
which each bit represents the presence or absence of a key column value.

D.
Updating the key column locks the whole bitmap segment that contains the bit for the key value
to be updated.



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