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For a successful Data Warehouse Delivery Sequence, a backload of atleast two years worth of sales history from archive tape is necessary. This would allow the business user to analyze seasonal sales trends year on year. However, the data volumes could be such that the existing relatively small data warehouse becomes a much larger one. For example, a 50 GB database could easily expand to become 400 GR. Once this happens, the operational management issues become far more complex, and require special strategies and facilities to resolve. For example, backup and recovery procedures become much more complex, disk failures increase dramatically, and load processes take much longer to execute.

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In order to resolve these complex issues, we recommend that the activity to backload history is implemented within a separate phase (the history load phase). This allows you to focus on resolving the very large database (VLDB) issues without increasing the complexity even further by extending the scope of the data warehouse.