@VelmuruganA6488 CFS version 6.5 was primarily designed to work with Oracle 12c, and official compatibility with Oracle 19c may not be explicitly documented. While some organizations have successfully conducted POC upgrades to Oracle 19c with CFS 6.5, it's essential to thoroughly test your specific environment to ensure compatibility. Known challenges when upgrading to Oracle 19c can include deprecated features, changes in database behavior, and potential integration issues with WebSphere Application Server. To mitigate these risks, ensure that you perform comprehensive testing during your POC phase and review Oracle’s and Chordiant’s latest compatibility guidelines. It is also advisable to engage with Oracle support or a certified Oracle partner to assist with the migration process, as they can provide expert guidance and help address any issues that arise. Additionally, consider reviewing any available patches or updates for CFS 6.5 that might enhance compatibility with Oracle 19c. Planning a detailed upgrade strategy, including backups and rollback plans, will be crucial to ensure a smooth transition. Given that the upgrade is mandatory for your operations, prioritizing these steps will help achieve a successful migration to Oracle 19c while maintaining the stability and performance of your Chordiant Foundation Server environment.