单选题Why does performance degrade when many UPDATE， INSERT， or DELETE statements are issued on a tablethat has an associated Bitmap index（）AThe DML operations re-create the Bitmap index blocks.BThe Bitmap index is rebuilt automatically after a DML operation.CThe smallest amount of a bitmap that can be locked is a bitmap segment.DAdditional time is taken to remove NULL values from the Bitmap index after a DML operation.
单选题
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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