First, let's look at the performance effect of mail file size.
首先，看一下邮件文件的大小对性能产生的影响。
Here are some factors that were found to not have a significant performance effect.
下面这些因素对性能的影响不是很大。
The results indicate that there is a beneficial performance effect from having transaction logging enabled.
结果表明启用事务日志能够提升性能。
The question that arises is this one: If logging can have a positive performance effect, can we see greater improvement through tuning?
存在的问题是：如果日志记录对性能的影响是正面的，那么可以通过调优来实现更好的性能吗？
There was not a significant performance effect, which was most likely due to the lack of a bottleneck on the logging disk because the level of concurrency was fairly low.
结果表明性能的差别不大，很可能是因为并发性水平很低，日志磁盘没有成为瓶颈。
Lead acid battery is an important part of the Uninterruptable power system UPS, the battery performance effect directly the safety and reliability of the whole power supply system.
铅酸电池是UPS不间断电源系统重要组成部分，电池性能的优劣直接影响整个供电系统的安全性和可靠性。
Lead acid battery is an important part of the Uninterruptable power system UPS, the battery performance effect directly the safety and reliability of the whole power supply system.
铅酸电池是UPS不间断电源系统重要组成部分，电池性能的优劣直接影响整个供电系统的安全性和可靠性。
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