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.
Resource Access Control Facility. RACF, [usually pronounced Rack-Eff] short for Resource Access Control Facility, is an IBM software product. It is a security system that provides access control and auditing functionality for the z/OS and z/VM operating systems. RACF was introduced in 1976. Its main features are: 1  Identification and verification of a user via user id and password check (authentication) 2  Identification, classification and protection of system resources. 3  Maintenance of access rights to the protected resources (authorization) 4  Control the means of access to protected resources.