Official comment

Dbvisit Standby trace files are files that are created every time Dbvisit Standby executes, these trace files contain a large amount of information about the execution of Dbvisit Standby and can be sent to Dbvisit support for fast issue resolution. These files can become very big in size and use up a lot of disk space.
One can refer to the following online link to set certain variables to manage the maintenance of these trace files.
https://dbvisit.atlassian.net/wiki/display/UGDS7/Dbvisit+Standby+Log+and+Trace+Files