If you are on Oracle 12.1 or higher you are using Unified Audit unless you ahve explicitly disabled it. Which is a very good idea on 12.1. However, you could be using it so much better. If you aren't auditing what's going on in your database, how would you know if you have a data breach, who did it and how. Potentially even what was stolen. You might also be suffering unexpected performance issues in relation to the Unified Audit, and not just in the broken 12.1 implementation of it! It just might not have materialised yet.