Linesperminute (LPM) : a standard measurement of typesetting speed or line printer speed.
每分钟行数：排字速度或行印机速度的标准计算法。
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The initial lines of code obtain a connection to the production database, followed by a series of show status queries that let you calculate queries perminute and then break them down by type.
代码开始的几行获得到生产数据库的连接，接着是一系列 show status查询，让您计算每分钟的查询数，并按类型把它们分开。