用mysqladmin看数据库统计信息的变化

mysqladmin extended -i10 -r

每隔10秒，看状态变量与上一次输出的差值。

文档中是这样说明的：

--relative, -r

Show the difference between the current and previous values when used with the --sleep option. Currently, this option works only with the extended-status command.

--sleep=delay, -i delay

Execute commands repeatedly, sleeping for delay seconds in between. The --count option determines the number of iterations.