[单选] Why does performance degrade when many UPDATE， INSERT， or DELETE statements are issued on a tablethat has an associated Bitmap index（）

A . The DML operations re-create the Bitmap index blocks.
B . The Bitmap index is rebuilt automatically after a DML operation.
C . The smallest amount of a bitmap that can be locked is a bitmap segment.
D . Additional time is taken to remove NULL values from the Bitmap index after a DML operation.

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[单选] Why does performance degrade when many UPDATE， INSERT， or DELETE statements are issued on a tablethat has an associated Bitmap index（）

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