Definition of irrigation. 1  1 : the therapeutic flushing of a body part with a stream of liquid. 2  2 : the watering of land by artificial means to foster plant growth.
Answer: To start with, Oracle Real Application Clusters (RAC) are a database system involving a configuration of multiple hosts or servers joined together with clustering software and accessing the shared disk storage structures.
This article assumes the following: 1  The reader has already built and configured a two-node Oracle RAC using the article Building an Inexpensive Oracle RAC 11g R2 on Linux - (RHEL 5). Note: The current Oracle RAC has been upgraded from its base release 11.2.0.1 to 11.2.0.3 by applying the 10404530 patchset.