Components of datawarehouse?

Below are the components of a data warehouse:-

Source databases/systems (Example - Legacy, relational, text or external sources)

Data extraction/transformation/load (ETL) tool (Example –Informatica, Datastage)

Data warehouse maintenance and administration tools

Data modeling tool or interface to external data models (Example –Erwin)

Warehouse databases (Example-Teradata, Oracle, and MySql)

End-user data access and analysis/reporting tools (Example –OBIEE, Business Objects)