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.
The Oracle Application Express engine runs directly in the Oracle Database and exploits the database's extraordinarily scalable and efficient architecture. You can also take full advantage of improved performance with Exadata, Real Application Clusters (RAC), and the In-Memory option.