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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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出自：Oracle认证

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