The data warehouse is normal designed as three tier architecture.
- The lower most tier is a relational database where the data from various servers are populated after several data cleansing, transformations which are done by the ETL tools. In the relational database the data is prepared in such a way that all the relevant information can be easily populated in the data warehouse. This lower tier database is also referred as a staging database.
- The middle tier is the multidimensional OLAP cube where the data is populated in the form of facts and measures from the relational database. The data from the lower layer to middle layer does not undergo much transformation. The data is only organized into formulated dimensions and measures.
- The top most tier is the front end for the analyst and the executives who would view the data from the cube. It contains tools which aid in analysis and data mining.
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