Question

To address database failure (if the system crashes), what type of redundancy would you recommend to address this?

Answer 1

Data base failure what redundency occur:---

The underlying concept of redundant networks is simple. Without any backup systems in place, all it takes is one point of failure in a network to disrupt or bring down an entire system. Network redundancy is the process of adding additional instances of network devices and lines of communication to help ensure network availability and decrease the risk of failure along the critical data path.

Generally speaking, there are two forms of redundancy that data centers use to ensure systems will stay up and running:

• Fault Tolerance: A fault-tolerant redundant system provides full hardware redundancy, mirroring applications across two or more identical systems that run in tandem. Should anything go wrong with the primary system, the mirrored backup system will take over with no loss of service. Ideal for any operations in which any amount of downtime is unacceptable (such as industrial or healthcare applications), fault-tolerance redundant systems are complex and often expensive to implement.

Redundancy, and Failure Group Options

If you specify mirroring for a file, then Oracle ASM automatically stores redundant copies of the file extents in separate failure groups. Failure groups apply only to normal and high redundancy disk groups. You can define the failure groups for each disk group when you create or alter the disk group.