OCP-1Z0-052-V9.02-201题

201.Why does performance degrade when many UPDATE, INSERT or DELETE statements are issued
on a table that 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
Answer: C