Setting this variable to "1" (on, true, yes) causes the transaction management system to assume that the log file is actually a device, rather than a file. This means that a special device locking method is used on the log file. It also guarantees that the log file is opened "append" and that no seeks are performed on it. This allows for the use of a tape device for the log file on many systems. The default setting is "0" (off, false, no).