The contribution of linked open data to augment a traditional data warehouse

The arrival of Big Data has contributed positively to the evolution of the data warehouse (DW ) technology. This gives birth of augmented DW s that aim at maximizing the effectiveness of existing ones. Various augmentation scenarios have been proposed and adopted by firms and industry covering several aspects such as new data sources (e.g., Linked Open Data (LOD), social, stream and IoT data), data ingestion, advanced deployment infrastructures, programming paradigms, data visualization. These scenarios allow companies reaching valuable decisions. By examining traditional DW s, we realized that they do not fulfill all decision-maker requirements since data sources alimenting a target DW are not rich enough to capture Big Data. The arrival of LOD era is an excellent opportunity to enrich traditional DW s with a new V dimension: Value. In this paper, we first conceptualize the variety of internal and external sources and study its effect on the ETL phase to ease the value capturing. Secondly, a Value-driven approach for the DW design is discussed. Thirdly, three realistic scenarios for integrating LOD in the DW landscape are given. Finally, experiments are conducted showing the added value by augmenting the existing DW environment with LOD.