Unfortunately data breach is more a matter of when rather than if in today's world. Even the BBC discusses data breaches without bringing in an expert anymore. This is why adequate response is more important than ever before.
We are experts in performing incident response in Oracle databases and subsequent forensic analysis to establish how the database was breached and what data was stolen. Pete Finnigan has written a book on the subject - https://www.amazon.co.uk/Oracle-Incident-Response-Forensics-Responding/dp/1484232631 - (broken link) Oracle Incident Response and Forensics.