多项选择题

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

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Given below is a list of scenarios：
1） A user terminates his session abnormally.
2） The connection between the server and the client application terminates because of a network failure.
3） A schema is accidentally dropped.
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5） The hard disk gets corrupted and the data files in the disk are lost.
6） The database instance abnormally shuts down because of power failure.
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C.3， 4， and 5
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