sqoop imports data from oracle exadata has duplicates

Hi I have used sqoop with oracle exadata which results in complete row duplicate ,at present we are removing using the distinct query and dumping into another target table,Please suggest on this

Background for oracle table :

Oracle used for sqoop import have no primary keys involved (i.e) tables are of scd type2 and have complex keys as primary keys which does not suit split by option and tables are very huge(100gig)

Command used for sqoop import from oracle exadata

sqoop import --connect %s@//%s:%s/%s --username %s -password %s --table %s.%s --fields-terminated-by '%s' --hive-drop-import-delims --hive-import --hive-overwrite --hive-table %s.%s --null-string '\\\N' --null-non-string '\\\N' --m %s --fetch-size=2500