To reduce the probability of the system failing and to minimize its effects, you have the following options, among others.
· Use different hard disks for the data and log areas.
· Mirror the log area and the data area using hardware-based means, for example by using RAID-5 or RAID-1 systems. When you select the RAID system, see to it that the RAID Controller has a good write performance and that caches can still be saved to the hard disk even when there is a power cut.
· If you are using fault-tolerant hardware, then extend the capacity only using the same type of hardware. For example, extend RAID-5 systems with RAID-5 systems only.
· Choose suitable log settings for your database system:
¡ If hardware-based mirroring is not possible, then configure the log mode so that the log area is mirrored based on software.
¡ Switch off the overwrite mode for the log area.
¡ Always leave the redo log management switched on.
· Create an individual backup and maintenance plan for your database system.