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.
RAC using Automatic Storage Management (ASM) 1  ASM was introduced in Oracle 10g, and is widely used in both RAC and single instance environments. Oracle created ASM as a way for DBAs to simplify their storage options, especially when using a cluster environment.