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Continue to ChatOracle 12cR1 : ORA-16775 with Cascading Standby Databases https://rene-ace.com/oracle-12cr1-ora-16775-with-cascading-standby-databases/
Oracle 12cR1 : ORA-16775 with Cascading Standby Databases https://rene-ace.com/oracle-12cr1-ora-16775-with-cascading-standby-databases/