ORA-03997
DML statement failed because a column or table is currently being used in a Barrier DDL statement with ID string.
Cause
Cannot perform DML on the column or table currently being used by Barrier DDL. In sharding replication setup, DMLs affecting the columns involved in a Barrier DDL statement are restricted until the DDL has completed.
Action
Retry the DML operations after the barrier DDL statement completes.