The consultancy role was carried out on behalf of Hanston Technology Partners Ltd for Network Rail. Our engineer's objective was to investigate and propose solutions to the delays and poor data quality that Hanston's client was experiencing from their supplier. We worked closely with the supplier's DBA to understand the complex delivery mechanism used to transfer data to Network Rail. Our work involved the investigation of a 4.6Tb Oracle 9i application, which resided on Windows 2000 platform and using HP SAN technology. The investigation was carried out on the database performance, the workflow of the data processing and the data migration process. Transportable tablespaces was the main mechanism for moving data. There being some 13000 tablespaces was not only a challenge to the application but Oracle themselves have not experienced such extensive use of this mechanism. Problem hotspots were identified and reports with proposed solutions were delivered to our client.