In our house, two identical instances, PROD and TEST, on one sun server. I have been using the test instance to practice to learn to be an oracle DBA ( i am not one still now). I know only one way to shut down the test instance is shuting down the sun server that also shuts down the PROD instance. Please tell me if there is other way to shutdown the test instance without bothering the PROD instance which is supposed to be up all the time. Oracle version 7.1.4 on Unix os. Any suggestion is appreciated very much.