Finally, the big bang scenario is often more transparent and straight forward for both the customer and the organization. During the migration period, both the legacy systems as the new system are unavailable. This means that it this period is critical and should be kept as short as possible.
For these reasons, several trial migrations are performed with representative data prior to the “real” data migration so that the lead times and data quality issues can be precisely determined. An additional advantage is that this data can be used during testing, so that the results of these test scenarios are representative of the final production situation.
Data migration example
John Wittekamp, Chief Technology Officer at DELTA Fiber Netherlands emphasizes the importance of test runs during a migration:
“In particular, performing another test run was typically something that was very much stimulated by Type 2 Solutions to ensure that you achieve the best quality you can deliver.”