Approaches to Building a SAP Data Warehouse
For SAP users, there are three ways to build a SAP data warehouse:
Use SAP's Business Warehouse (BW) modeling and management application to build and run your SAP data warehouse based on traditional SAP RDBMS databases or on SAP HANA's in-memory database and application platform.
Leverage third-party, best-of-breed SAP data integration and data warehousing tools to extract and load data into the data warehousing or analytics platform of your choice.
Employ third-party data replication and ETL tools along with SAP BW to better integrate SAP and non-SAP data while leveraging BW's template-based approach to data warehousing.