Hi,
I was able to configure AWS Aurora as cache database using MySQL5 adapter. Please be advised that MySQL has to be configured for Unicode support. You can refer the knowledge base article about '[Configuring MySQL for full Unicode support](https://community.denodo.com/kb/view/document/Configuring%20MySQL%20for%20full%20Unicode%20support?category=Data+Sources)' for more information.The Performance factor is based upon your requirements and advantages of the Database and mostly depends on your scenario.
It is recommended to use the external database for cache especially in the production environment as you can use AWS Aurora as discussed above.
For detailed information, you can refer to [How to connect to Amazon Aurora from Denodo](https://community.denodo.com/kb/view/document/How%20to%20connect%20to%20Amazon%20Aurora%20from%20Denodo?category=Data+Sources) and [Best Practices to Maximize Performance III: Caching](https://community.denodo.com/kb/view/document/Best%20Practices%20to%20Maximize%20Performance%20III:%20Caching?category=Best+Practices) Knowledge Base articles.
Hope this helps!