A 40TB migration sounds terrifying. With the right assessment and reconciliation strategy, it's routine. Here's our checklist.
The fear in any warehouse migration is silent data drift — the moment a number in the new platform doesn't match the old one and trust evaporates.
We front-load an automated assessment that inventories tables, dependencies, and workloads, then prioritize by business value and migration difficulty. Reconciliation testing runs continuously, comparing row counts, aggregates, and sampled records between systems.
Done this way, migration is not a big-bang event but a steady, reversible march. The legacy system stays live until parity is proven, and only then do we cut over.