The details to do this vary depending on your hardware platform. It is a little different on Unix/Linux and Windows. But to make it easier, just fire up the Database Configuration Assistant (DBCA) that was installed when you installed the Oracle software. On Unix/Linux, this utility is found in $ORACLE_HOME/bin. On Windows, there will be a shortcut somewhere under Start->Programs->Oracle. Fire up this utility and tell it you want to create a new database. It's that simple! Without this utility, the instructions get more complicated.
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