One Node RAC concept.

One Node RAC is a single instance of Oracle RAC running on one node in a cluster. The essence is many databases are consolidated into a single cluster.

The single cluster includes more than one nodes and more than one database are running on one node. This provides the high availability for operating system. It wouldnot help if the database was shutdown by accident. You must have software home on any node in the cluster. You must provide the candidate list of nodes during the One Node RAC installation. The SCAN allow the client connections to connect database instance per the workload or whenever a failover or Omotion takes place. Omotion is a utility allowing you to move the one Node RAC instance form one node to another in the cluster. The instance caging can help compute the CPU performance for the multiple instances in one nodes even between the different nodes. Multiple database instances sharing a single server will degrade the performance if the CPU contention take place. the instance caging just focuses on managing CPU by limiting the CPU usage of an oracle instance.

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