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Continue to ChatUpgrading 12cR1 to 12cR2 Non-CDB database http://oracle-help.com/oracle-database/multitenant/upgrading-12cr1-to-12cr2-non-cdb-database/
Upgrading 12cR1 to 12cR2 Non-CDB database http://oracle-help.com/oracle-database/multitenant/upgrading-12cr1-to-12cr2-non-cdb-database/