As part of a divestiture from parent company Alcoa, Closure Systems International cloned the 4TB Alcoa environment and selectively removed over 5 Billion records containing Alcoa data. 29000 table validations, 7000 custom scripts, 9 test iterations, and many sleepless nights later, they had a fully operating instance. The leaders of this project will walk you through how they convinced Alcoa (and Oracle) that this was a good idea, and how they executed the project with zero lost or corrupted records.