Well Arlo Gurthrie sang in four part harmony in the song Alice's Restaurant.

If you only have one node you are limited in what you can do for node balancing. One option would be to have two or more network cards, each with a different fixed IP address connected to a different router/switch. You would then configure the listener to listen on all of the ip addresses, and the clients to be aware of those IP addresses and to do a round robbin style selection on which one to use when making a connection. So if someone drops a coke on a single router/switch, or kicks out a cord then people could reconnect with a different IP address on a different router/switch. But I'm guessing that this won't be terribly useful.

But if you really want load balancing you are talking about setting up a RAC database, which is not a simple process. If you want redundancy, then you can either do RAC or a standby database. Both of the above options require more than one server. And RAC requires storage that is accessable from each node. It just depends on what you need and can pay for.