如系统性能小节所述，监控磁盘活动、CPU和内存使用量可以确定磁盘子系统、处理速度或分页是否影响了性能。
As discussed in system performance, monitor disk activity, CPU and memory usage to determine whether the disk subsystems, processing speed or paging are limiting performance.
开始对系统进行监控的最佳时间是在首次将系统应用到生产环境中并正常运行时(而不是等到用户抱怨系统性能非常糟糕的时候)。
The best time to start monitoring your systems is when you first put your system in production, and it is running well (rather than waiting until your users are screaming about slow performance).
包括报警机制原理，信息查询方法，主机行为监控方法，外联监控等，并提出了一些提高系统性能的解决方案。
This paper at last introduce the scheme of this project, particularly introduced how to develop host behavior monitor module, which includes trap, information query, behavior monitor and so on.
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