Specify /dev/null for a tape device

A best practice is to not use /dev/null as the device when backing up. However, if you decide that you do not need to recover transactions from the logical log, you can specify /dev/null as a tape device for logical-log backups

When you specify /dev/null as a backup tape device, you can avoid the overhead of a level-0 backup that is required after some operations, such as changing the logging status of a database. Obviously, you cannot restore storage spaces from a backup to /dev/null.
When you specify the tape device as /dev/null, block size and tape size are ignored. If you set the LTAPEDEV configuration parameter either to or from /dev/null, you must restart the database server for the new setting to take effect.
Important: When you set the LTAPEDEV configuration parameter to /dev/null, the database server marks the logical-log files as backed up as soon as they become full, effectively discarding logical-log information.