High Availability

High availability can be achieved by implementing storage redundancy. In storage terms, these are mirroring techniques. There are three options for mirroring in a database environment:

  • Hardware-based mirroring

  • Using Oracle ASM for mirroring

  • Software-based mirroring not using Oracle ASM

    Oracle recommends against software-based mirroring that does not use Oracle ASM.

This section contains the following topics:


In a cluster configuration, the software you use must support cluster capabilities. Oracle ASM is a cluster file system for Oracle Database files.