Overwrite Mode for the Log Area 
You can use this log setting to configure whether the database system overwrites the log area cyclically without first backing up the log entries.
Caution
Only switch on overwrite mode if it is not important to you that you can only restore the system to the status of the last available data backup.
End of the caution.
More Information
Concepts of the Database System, How Databases Log Data Changes
Database Studio, Changing Log Settings
Database Administration in CCMS, Log Area