本文介绍了OneNodeRAC的概念，即在一个集群节点上运行的单个Oracle RAC实例。通过这种方式，可以将多个数据库整合到单一集群中，提高操作系统的高可用性。文章还讨论了OneNodeRAC安装过程中的一些关键步骤，如软件家目录的设置、候选节点列表的提供，以及客户端连接如何通过扫描监听器（SCAN）来实现负载均衡和故障转移。
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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