--DROP USER %DBROUSER% CASCADE;
--DROP USER %DBRWUSER% CASCADE;

BEGIN
  FOR cur IN (SELECT 'DROP TABLE '||table_name||' CASCADE CONSTRAINTS PURGE'
      stmt from all_tables where owner=UPPER('%DBROOTUSER%')) LOOP
    EXECUTE IMMEDIATE cur.stmt;
  END LOOP;

  FOR cur IN (SELECT 'DROP '||object_type||' '||object_name
      stmt from all_objects where owner=UPPER('%DBROOTUSER%')) LOOP
    EXECUTE IMMEDIATE cur.stmt;
  END LOOP;
END;
/