Data warehousing dates back to the late 1980s when Barry Devlin and Paul Murphy from IBM developed business data warehouse. In actuality, data warehouse was developed to provide an architectural model for the flow of data, specifically from from operational systems to decision support environments. By addressing problems related to the flow, data warehouse tried to support multiple environments in an effective manner. Thus by introducing the concept of data warehouse, Bill and Ralph were considered as the pioneers of data warehouse. This means that before the concept of data warehouse, data storage and synchronisation was not conducted. Post the development of business data warehouse, data warehouse has come a long way and are today an integral part of companies and economies around the world.