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At the heart of both Pentaho and Jaspersoft is powerful open source OLAP engine called Mondrian, which enables OLAP capabilities on top of any database. Using this tool you can create Pivot Tables to splice and dice terabytes of data without the huge costs associated with high end businesses intelligence applications like Cognos or Microstrategy.
Millersoft Ltd has long experience with Mondrian, running against both small and huge databases. If you need help realising its capabilities then give us a call.