Data Warehouses (DWs) are the enterprise's most valuable assets. It contains critical business information. It helps them in making strategic decisions. Since it is a vital asset of any organization, it becomes an appealing target for malicious attackers both from inside and outside. Because of enormous size of data and the nature of DW queries, the prevalent security solutions for databases are not effective in DW. These solutions are inefficient and consume too many resources due to overhead. It also results in too many false positive alarms.