Basic steps upgrade to 12c

After reading the Upgrade Guide, you might like to create a short list of steps to take.
You are always responsible to check if the following steps are suitable for your situation. Always check the Upgrade Guide or consult Oracle Support.

This is how I manually upgraded a simple Dev database from 10.2 to 12.1 (no multi-tenant)

• Run the <12c-home>/rdbms/admin/preupgrd.sql on the old database.
• Check the $ORACLE_BASE/cfgtoollogs//preupgrade/preupgrade.log and fix whatever needs to be fixed
• Re-run preupgrd.sql to check after fixing.
• Shutdown old database.
• Move all datafiles, controlfiles, redologfiles etc to new host
• Move the init.ora to new host.
• Make changes in init.ora following preupgrade.log
• Create directories for e.g. audit_dump_dest
• SQL> startup Upgrade
• Go to OS prompt, cd $ORACLE_HOME/rdbms/admin
• $ORACLE_HOME/perl/bin/perl catctl.pl catupgrd.sql  (takes about 30-40mins)
• SQL> startup
• SQL> @?/rdbms/admin/utlrp    (to repair invalid objects)
• SQL> @?/rdbms/admin/utlu121s.sql   (to check status of components, should show VALID only)
• Backup database