Set the Environment
Configuration
Configure the Database
Create a Database
This process is essentially the same as that described for the Windows platform. On Linux the Database Configuration Assistant binary is called dbca and is located in the bin directory that you just added to the PATH environment variable. For this exercise the SID name is r10103. The ps -ef output shows a number of processes whose names end with _r10103.
You will notice that the *:/app/oracle/product/10.1.0/Db_2:N line in the /etc/oratab has been changed to r10103:/app/oracle/product/10.1.0/Db_2:N. Modify this file to change the third field from N to Y. This will cause the dbstart utility to restart the database after a system reboot.