系统监控器（System monitor）是在数据库系统启动时执行恢复工作的强制性进程。比如在并行服务器模式下（两台服务器共用一磁盘组），SMON可以恢复另一台处于失败的数据库。使系统切换到另一台正常的服务器上。
帮助对象包括缓存管理(Cache对象)和用于发现应用程序源文件改变的内部文件系统监控器。
Helper objects include the cache manager (the cache object) and the internal file system monitor used to detect changes in the source files that form the application.
在IBM DB 2 9.7中，活动和统计事件监控器都具有DETAILS_XML监控器元素，该元素存储包含大量活动和系统指标的XML文档。
In IBM DB2 9.7, both the activity and statistics event monitors have a DETAILS_XML monitor element that stores an XML document which contains a wealth of activity and system metrics.
首先讨论了逻辑时钟方法及逻辑时钟的修改算法，然后介绍了自行研制的分布式s4系统中逻辑时钟监控器模块的实现方法。
Firstly it discusses the approach of logical clock and revise algorithm of logical clock, then introduces the implementation approach of logical time monitor module in distributed S4 system.
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