175.What can you achieve by implementing reverse key index?
2016-08-08 22:37
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175.What can you achieve by implementing reverse key index?
A.Reverse the bytes of each column indexed including the rowID.
B.Store a bitmap for each key value instead of a list of row IDs in the leaf node.
C.Prevent contention on the highest leaf block when using sequences to generate keys.
D.Remove repeated key values from the index to fit more index entries in a given amount of disk space.
答案：C
解析：
参考：171题
A：不包括rowid，只有列值按照字节反转
B：这个是位图索引，没啥关系
C：正确
D：错误
A.Reverse the bytes of each column indexed including the rowID.
B.Store a bitmap for each key value instead of a list of row IDs in the leaf node.
C.Prevent contention on the highest leaf block when using sequences to generate keys.
D.Remove repeated key values from the index to fit more index entries in a given amount of disk space.
答案：C
解析：
参考：171题
A：不包括rowid，只有列值按照字节反转
B：这个是位图索引，没啥关系
C：正确
D：错误
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