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How to create multiple instances in a Unix system?
The easiest way to create a second instance is to use the Database Configuration Assistant (DBCA). Make sure your window can run X windows utilities, like xclock. Then, set your ORACLE_HOME and PATH environment variables to point to your Oracle version. Depending on your Unix platform, you may have to set other environment variables like LD_LIBRARY_PATH. Once your environment is set up, type 'dbca' to start the Database Configuration Assistant. This GUI wizard will walk you through the process of creating a second instance.