Oracle Real Application Cluster (RAC) is a "share-everything"
database architecture that can provide high availability and load
balancing. A typical configuration for an Oracle RAC contains two
or more Oracle RAC nodes that are clustered together and share the
same storage.
About this task
This figure depicts a typical RAC physical topology in a
cluster environment for the application server, and both the failover
and load balancing are enabled:
The application
server cluster consists of two members: cluster-member1 and cluster-member2.
The Oracle RAC physical configuration contains two nodes: rac-node1
and rac-node2. The RAC nodes can be located in the same physical machine
with the cluster members, or they could be placed in entirely different
machines. The actual placement does not impact the fundamental qualities
of the services provided by RAC. To achieve both high availability
and load-balancing, you can specify the Oracle data source URL for
both cluster members in the application server with the required properties.