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A normal Oracle installation consists of a single Oracle instance that accesses a database on the same computer system. With RAC (formerly known as Oracle Parallel Server), multiple instances on different nodes can access the same database files simultaneously. In case of a node failure, the workload of this node will be handled by the other node of the cluster.
When the system is prepared for installation, the Oracle Universal Installer (OUI) presents the list of all cluster nodes, enabling the selection of a subset as targets. The OUI copies the Oracle software onto the first node, and then propagates the software onto the rest of the chosen nodes of the cluster. Along with all the Oracle software, Oracle Enterprise Manager (the central managing console) is automatically installed and set up. When the installation is finished, the database creation wizard and the network configuration wizard are automatically invoked.
For more information about Oracle RAC installation, see the Oracle installation documentation or the Oracle RAC whitepapers at http://www.oracle.com/technology/products/database/clustering/RACWhitepapers.html.
Oracle high availability features are only relevant for Control-M/Enterprise Manager.
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