The volume memory area used for logging is called the log area. A log area can extend across several log volumes.
For information about the log concept, see Background Knowledge SAP DB, Log Concept
For
security, the log area should always be mirrored. If possible, you should
mirror the log area on a hardware basis.
If hardware-based mirroring is not possible, you can use an appropriate log mode
setting. In a production database system, make sure that redo log management
is always activated, and that the log area cannot be overwritten until it has
been backed up (Log
Settings).
A full log causes the database to stop. Therefore, you must always carry out log backups in good time. For this purpose, activate automatic log backup.
In log backups, the log area is not saved as a whole. Instead, it is saved in backup units, called log segments.