Data Warehousing

A data warehouse is constructed by integrating data from multiple heterogeneous sources. It supports analytical reporting, structured and/or ad hoc queries and decision making. This tutorial adopts a step-by-step approach to explain all the necessary concepts of data warehousing.

Please refer the below links,

http://www.tutorialspoint.com/dwh/

http://www.dba-oracle.com/art_dbazine_oracle_10g_data_warehouse.htm

Concepts:

http://dwhlaureate.blogspot.in/

Oracle Data Warehousing:

http://oracle-big-data.blogspot.in/