问题描述：
[单选]
Consider the following:Which statement best describes the meaning of the value for the key_len column？哪个语句最能描述key_len列的值的含义？
A．It shows the total size of the index row.
B．It shows how many columns in the index are examined.
C．It shows the number of characters indexed in the key.
D．It shows how many bytes will be used from each index row.(索引列的数据类型字节数) 它显示每个索引行将使用多少字节。
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上一篇：You have a server that has very limited memory but has a very large table．You will use mysqldump to back up this table．（）你的服务器内存非常有限，但是它的内存非常大表。你将使用mysqldump备份此表。Which option will ensure mysqldump will process a row at a time instead of buffering a set of rows？哪个选项可以确保mysqldump一次处理一行而不是缓冲一组行？
下一篇：Which three are properties of the MyISAM storage engine？（）MyISAM存储引擎的哪三个属性？
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