Oracle Solution for Error ora-16129

ORA-16129: unsupported dml encountered

What triggered the Error:

DML to tables in the SYS schema have been updated and are not part of a DDL operation. This may be due to some DBA activity or DML associated with a kernel PL/SQL request that Logical Standby does not yet support.

What should we do to fix it:

Check the DBA_LOGSTDBY_EVENTS table for the name of the table being processed. Possibly use Log Miner to understand the transaction, and provide a compensating transaction on the standby system. Once complete, call DBMS_LOGSTDBY.SKIP_TRANSACTION with the associated transaction id, and resume apply.