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.
1 Includes Oracle WebLogic Server 12c, which is certified for the full Java EE 6 platform specification and has improved integration with Oracle Real Application Clusters (Oracle RAC)  Combine the functionality of Oracle WebLogic Server and Oracle Application Server for custom, legacy, and/or packaged applications.