When dealing with 11TB of data and 10 billion records, the "standard" ways of ensuring data integrity begin to fail. Conventional read-side duplicate checks can become a bottleneck that can paralyse a system, especially under the scrutiny of financial regulators such as BaFin.

This session moves beyond the theory of database constraints and provides a battle-tested blueprint for managing massive data volumes in highly compliant environments. We will explore the architectural shift from read-side validation to a Write-Side Integrity Strategy, detailing the logic, the specific Spring-based implementation, and the performance gains realised.
Furthermore, we will break down the ongoing "Exit Strategy" from legacy Oracle Exadata to Cloud PostgreSQL. We will share best practices for a Zero-Loss Migration, ensuring 100% data integrity is maintained as we move billions of records under extreme time and regulatory pressure.