This class provides a very simple trace or logging mechanism that writes trace messages to a file in the current directory.
这个类提供一个非常简单的跟踪或日志机制，将跟踪消息写入当前目录中的一个文件中。
2
In a large partition environment, set the default Performance Expert login mode to history-only mode, because too many users logging in using current mode can impact the monitored DB2 instance.