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The 3 instead of triggers are created regardless of whether the table contained a user defined trigger or not. They are primarily used to implement the DML, but are used for other things as well as you noted. To change the definition of the trigger, you would need to use the Workspace Manager DDL procedure. See section 1.8 of the user guide. Essentially, you execute dbms_wm.beginDDL on the table, update the trigger on the <table_name>LTS table that is created (the trigger will have the original name that you gave it), then execute dbmswm.commitDDL.