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.
Oracle Clusterware is portable cluster software that allows clustering of independent servers so that they cooperate as a single system.racle Clusterware is portable cluster software that allows clustering of independent servers so that they cooperate as a single system.