Oracle Database Online Documentation 11g
Release 2 (11.2)
Supporting documentation treats advanced topics related to grid computing. In general, the 2 Day + books refer you to these topics when needed.
Oracle Real Application Clusters
Oracle Real Application Clusters enables a single database to run across multiple clustered nodes in a grid, pooling the processing resources of several standard machines.
Oracle Clusterware is a portable cluster software that allows clustering of single servers so that they cooperate as a single system. Oracle Clusterware also provides the required infrastructure for Oracle Real Application Clusters (Oracle RAC). Oracle Clusterware also enables the protection of any Oracle application or any other kind of application within a cluster.
Oracle Automatic Storage Management
Oracle Automatic Storage Management (Oracle ASM) provides a virtualization layer between the database and storage. It treats multiple disks as a single disk group, and lets you dynamically add or remove disks while keeping databases online.