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One key element of the security concept for your database system is the regular backing up of your data. You should therefore regularly perform data backups and log backups.

You can use external backup tools to reduce the time needed for backup.

Data Backup

Note that, in the case of a restore, a more up-to-date data backup means that fewer log entries need to be reproduced. Therefore, perform data backups as often as possible.

·        Perform a complete data backup on each day of production.

·        If you cannot or do not want to perform a data backup every day, you should at least perform an incremental data backup on each day of production.

Note

If complete data backup is active, incremental data backup cannot be started.

You can perform data backups in parallel to reduce the time required for the backups.

Log backups

In production systems, choose the following log settings: mirror the log area, the log area can be overwritten only after it has been backed up, and redo log management is always activated. Perform log backups at regular intervals.

·        Automatic log backup

The automatic log backup (autosave log mechanism) should always be active. Complete and incremental data backups are also possible while the automatic log backup is active.

·        Interactive log backup

You should save the log entries every productive day.

If automatic log backup is not active, you must regularly check that there is enough storage space available in the log area. If necessary, back up the log area immediately by starting an interactive log backup. If new log entries cannot be written to the log area because there is not enough storage space, the database stops.

·        Archiving of version files

You should regularly archive the version files written during a log backup to a medium of your choice. Once the files have been archived successfully, you can delete the version files written during the log backup, and thereby ensure that there is enough space available in the directory for version files.

If you use an external backup tool, you can automate the archiving of version files. To do this, follow the instructions in Archiving Version Files of the Log Area.

Note

Tapes containing data or log backups should not be directly overwritten with the next backup. If you retain, say, the last four backup generations, it may be possible to use an older backup if a media failure occurs.

 

 

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