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Oracle Fail Safe for
Windows, in combination with Microsoft Cluster Services, provides a failover solution
in the event of a system failure.
Fail Safe is primarily a disaster recovery tool, so some downtime does occur as part
of a failover operation. The recommended solution for server availability, since
Oracle9i, is Real Application Clusters.
Oracle Real Application Clusters
Real Application Clusters (RAC) replaced the Oracle Parallel Server (OPS) option
beginning with Oracle9i. RAC can provide failover support as well as increased scalability
on Unix, Linux, and Windows clusters. Key to improved scalability was the
introduction of Cache Fusion that greatly minimizes the amount of writing to disk
that was formerly used to control data locks. Oracle Database 10g introduced a new
level of RAC portability and Oracle support by providing integrated ???clusterware???
for the supported RAC platforms.
With Real Application Clusters, you can deploy multiple Oracle instances on multiple
nodes of a clustered solution or in a grid configuration.


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