Which statement best describes the meaning of the value for the key_len column?
A. It shows how many bytes will be used from each index row.
B. It shows the number of characters indexed in the key.
C. It shows the total size of the index row.
D. It shows how many columns in the index are examined.
Answer: Ahttp://www.cndba.cn/hbhe0316/article/22785http://www.cndba.cn/hbhe0316/article/22785http://www.cndba.cn/hbhe0316/article/22785

关于key_len的描述最合理的是：
A．使用到的索引的字节长度
B．使用到的索引的字符数量
C．索引行的总大小
D．扫描到的索引的字段数

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MYSQL