To upgrade from Oracle 11gR2 to Oracle 18c, we need to Enterprise Manager.

Copy the $ORACLE_HOME/rdbms/admin/emremove.sql script from the target ORACLE_HOME into the source ORACLE_HOME.

Step 1: If database control is configured, stop EM Database Control, using the following command

Step 2: Connect to the database using the SYS account AS SYSDBA

Without the set echo and server output commands, you will not be able to follow the progress of the script.

Stay tuned for more articles on Oracle 18c 

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