问题描述：
[单选]
You have table ‘apps’，’userdata’ on server that uses MyISAM storage engine． You want to transfer this data to server but use InnoDB engine instead．You execute the following commands:在使用MyISAM存储引擎的服务器上有表“apps”、“userdata”。您想将这些数据传输到服务器，但是使用InnoDB引擎相反，你执行以下命令：What effect does the – order-by-primary argument have on the mysqldump command？（）mysqldump命令对命令有什么影响？
A．It exports tables with the most indexes first to assist with import speeds.
B．It ensures that unique indexes have no conflicts when the data is dumped.
C．It orders by primary key to assist in speeding up importing to InnoDB tables. 它按主键排序，以帮助加快导入到InnoDB表的速度。
D．It must be specified so index data is dumped correctly when –on-create-info is used.
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上一篇：You examine the output of SHOW GLOBAL STATUS and notice that the value of Created_tmp_disk_tables is consistently increasing．您检查SHOW GLOBAL STATUS的输出，并注意到已创建的Created_tmp_disk_tables的值一直在增加。Which two variables would likely fix this issue？哪两个变量可以解决这个问题？
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