I am trying to import multiple tables from one database to another using impdp. During the import I got a lot of "ORA-39153 Table "schema"."table_name" exists and has been truncated. Data will be loaded but all dependent metadata will be skipped due to table_exists_action of truncate" errors. But, the import went fine and all the rows were imported successfully. However, when I tried to list out all the constraints and compare them with the constraints of the target table I found some that some of the constraints (Primary Keys ) were not imported. Is this expected ? Can you also let me know a way to bypass this issue ? I basically need to import all the data from my production database to the DR (backup) database using impdp.