What are the difficulties in data warehouse development?

Recently, a friend asked, what are the difficulties in data warehouse development?

After several years of development, we talked about data warehouses.TechnologyI personally don't think it is difficult to query and process large amounts of data and ETL processes in a data warehouse,

The problem is whether or not there is an unexpected problem. Taking big data processing as an example, the current distributedDatabaseMore and more vendors, such as NCR and DWA, can solve these problems.

I think the most difficult part of a data warehouse is to understand the business and its sensitivity to the business. How can we create value for your project?

Think of you as a 100% technician. You should be two separate persons, or have fewer technologies. The application and promotion of data warehouses are the value of data warehouses.