Which two statements are true regarding B-tree indexs()

A . The leaf blocks in the index are doubly linked. B . The leaf node stores a bitmap for each key value. C . The rows with NULL value in key columns also have entries in the index. D . The deletion of a row from the table causes a logical deletion in index leaf block and the space becomesavailable for the new leaf entry

时间:2022-10-23 09:29:14 所属题库:1Z0-052题库

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