DMT creates a new log file any time it begins an import, export, or diff operation. The name of the log file is always dmt.log. Any previous log file is renamed to

dmt.import.log.YYYY-MM-DD-HH-MM

where the file extension represents the date and time the previous file was last modified. (Note that the string import in the example above may instead say export or diff, depending upon the operation that was performed.) DMT retains up to 10 log files. The oldest file is deleted when creating a new one would exceed the limit of 10.