At run time, the Data Integration Service can create or it can drop and replace the table. The Data Integration Service creates or replaces the table based on the mapping flow or the associated data object.
When you configure the Write transformation to create or replace the target, the Data Integration Service drops any existing target table associated with the write object and creates a table based on the configuration to use the data object or to use the mapping flow.
When the Data Integration Service creates a table based on the data object, the table contains columns that match the ports in the data object. If you create or replace the target at run time with a customized data object, the Data Integration Service creates a table with the name referenced in the data object connection.
When the Data Integration Service creates a table based on the mapping flow, the table contains columns that match generated ports in the Write transformation.