To boost the Java performance on x64 Mac systems, Apple is evaluating a new Java VM that is derived the BSD port. You can try the new JVM using the -XXaltjvm=bsdserver VM args which is available in the recent JDK/JRE developer preview. Using this new VM may improve the Java performance and increase benchmark scores but performance drawbacks can be expected as well.
Use " sys as sysdba " as user name or supply the internal_logon with the value sysdba in the advanced properties tab. So internal_login is the property name that should be used to mark the current user as a sysdba.