User Guide

SAP AG November 2002
Automatic Log Backup
Automatic log backup [Page 142] is recommended to ensure the security of data in production
systems.
If automatic log backup is activated, a log segment is saved as soon as it has been filled. This
log segment is then released again. The advantage of this is that a log area [Page
142]
overflow is almost impossible.
This mechanism is particularly recommended for all database instances [Page
132] in which
extensive write and change-intensive transactions are carried out. In this way, constant
monitoring of the usage level of the log area is not necessary.
As long as automatic log backup is active, you cannot start an interactive log
backup [Page 139]. However, you can carry out a data backup [Page 131].
You can only carry out automatic log backups in
ONLINE.
operating mode [Page 145]
In the case of an automatic log backup, you can only copy the log entries to
version files [Page
153].
See also:
Backup Strategy [Page
39]
Saving Log Backups [Page 43]
Backup
The following backups should be carried out for the SAP DB database system at regular
intervals:
Data backup [Page
131]
142
•
Log backup [Page
]
•
All backups can be carried out on an individual backup medium [Page
150], and data backups
can also be carried out on a
138 .
group of parallel backup media [Page
]
The naming convention for a backup medium [Page
127] depends on whether you use an
138 .
external backup medium [Page
]
Name of standard backup medium [Page 145] •
• Name of external backup medium [Page
145]
See also:
Backup Strategy [Page
39]
Backup History
Information on all actions that have been carried out that relate to saving and recovering the
database instance [Page
132] are registered in chronological order in the backup history.
The system writes a backup history to log file dbm.knl. This file is in the database instance’s
147 .
run directory [Page
]
User Manual: SAP DB 126