For troubleshooting or maintenance purposes, you can manually clear the contents of a log. Clearing a log is different from rolling over a log in that the existing contents of the log will be deleted and not archived to a back-up file.
For example, one scenario in which clearing a log is useful is when you are trying to isolate the log messages related to a specific functional issue. You might clear a log, change the related logger's logging severity level to DEBUG, and then try to reproduce the issue. Afterward, the log would most likely isolate the event messages that can help troubleshoot the issue.
