As I started the development of Admin based onto MySQL, it is well tested.
As I love InstantDB I'm doing a lot of things with it and using it very often. Admin runs very good with InstantDB.
First tests with RMI-JDBC and InstantDB went pretty good.
In the beginning I did some tests by using postgres. These all went fine
Admin has now a much better support for ORACLE. since ORACLE is available for developers, I got it running in version