(参考)
According to the security rule, the Oracle server must be on the same machine as the Web server, since the communication with the Applet is done through Sockets. This is not always possible, so you will need something called a Connection Manager (from Oracle) or DBAnywhere from Symantec(http://www.symantec.com) (demo version available for testing) to act as a bridge between the client, the Web server and the Database server.