If you become familiar with Show trans output, you can determine if excessive time is spent in a general feature area or if a specific transaction is taking a longer than average time to execute.
如果您熟悉Show Trans输出，就可以判断出某一特性领域花费的时间是否过长，或者某一事务的执行时间是否明显长于平均时间。
Over that period, the average time to complete a job has dropped from 634 seconds to 395 seconds, while the output of MapReduce tasks has risen from 193 terabytes to 14,018 terabytes, Dean said.
同期，MapReduce对于一个工作的平均运行响应时间从634秒下降到了395秒，MapReduce任务的数据产出量从193 terabytes上升到了14018 terabytes。
Some experiments prove that the approach can not only improve the system's performance, but also decrease the average latency time of tuples and improve the output rate of tuples greatly.
实验表明该方法不但能提高系统的总体性能，而且可以减少元组的平均等待时间，大大提高了元组的输出速率。
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