Database trustworthiness has a real objective of keeping up the interior consistency of the information in the database. The database system is to keep up inside consistency volume, mixture and speed of data is seen by numerous clients as the primary database security concern. These can be thought to be the insignificant necessity for the database system to be utilized. Data are produced consistently from distinctive source. These information need to be composed and secured for precise and simple learning revelation. So, this paper concentrates on different security difficulties of data in 3-tier architecture design in admiration to data warehouse.