Log Settings 

The following log settings are possible:

·        You can mirror the log area.
If you cannot use hardware-base mirroring for the log area, we recommend that you use the software-based mirroring setting.
To make this setting, proceed as described in Log Mode.

·        You can decide to do without log backups and use a non-standard log backup strategy by setting the overwrite mode for the log area accordingly.
To make this setting, proceed as described in Overwrite Mode.

·        In very special situations, you can deactivate redo log management temporarily.
To do this, proceed as described in Activating or Deactivating Redo Log Management.

Combination of Log Settings

The combination of log settings you choose depends on your security requirements.

In production systems, you should aim for the highest possible security standards. In this case, make the following log settings:

·        Mirror log area (hardware-based)

·        Standard log backup operation (with log backups)

·        Redo log management always activated

·        Perform data and log backups

If you require a lower level of security for your system, you can decide not to mirror the log area.

Use different log backup operations only if all you require in the event of a database crash is for the system to be restored to the state of an existing data backup .

Deactivating redo log management places the security of your system at serious risk, and should be considered only under exceptional circumstances.