Concerns in using data warehouse

• Extracting, cleaning and loading data could be time consuming.
• Data warehousing project scope might increase.
• Problems with compatibility with systems already in place e.g. transaction processing system.
• Providing training to end-users, who end up not using the data warehouse.
• Security could develop into a serious issue, especially if the data warehouse is web accessible.
• A data warehouse is a HIGH maintenance system.