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Install 12c R1 RDBMS Oracle Home in a separate directory from the existing Oracle Home Start the installation as oracle user.
Start DBUA from the Oracle home where the new database software has been installed: Screen 1: - select Upgrade Oracle database option then click next Screen 2: àSelect Database page appears, listing the databases available for upgrade(Make sure 11g home should have valid entry in /etc/oratab.
If the source database does not have operating system authentication, then DBUA prompts you for SYSDBA user name and password.
From the Source Database Oracle Home drop-down list, choose the database you want to upgrade to Oracle Database 12c.
To the left of the listener name is a box for selecting the listener.
Select one or more listeners from the source Oracle home to be migrated to the new upgraded Oracle home.