CREATE MATERIALIZED VIEW MV_MY_MVIEW
TABLESPACE MYSCHEME
  INITRANS 2
STORAGE (
  INITIAL 64K
  NEXT 1M
  MAXEXTENTS UNLIMITED
)
LOGGING
BUILD IMMEDIATE
REFRESH FORCE 
START WITH TO_DATE('24/11/2014 01:00:00', 'MM/DD/SYYYY HH24:MI:SS') NEXT SYSDATE + 1
WITH PRIMARY KEY 
USING DEFAULT MASTER ROLLBACK SEGMENT DEFAULT LOCAL ROLLBACK SEGMENT 
DISABLE QUERY REWRITE
AS
SELECT *
  FROM V_MYVIEW@MY_DBLINK;

 select value from v$parameter where name='job_queue_processes';

Value 
50

DECLARE
  X NUMBER;
BEGIN
  SYS.DBMS_JOB.SUBMIT
  ( job       => X 
   ,what      => 'BEGIN
dbms_snapshot.refresh(''MV_MY_MVIEW'',''C'',atomic_refresh => TRUE);
END;'
   ,next_date => to_date('08/12/2014 01:00:00','dd/mm/yyyy hh24:mi:ss')
   ,interval  => 'trunc(SYSDATE+1)+1/24 '
   ,no_parse  => FALSE
  );
COMMIT;
END;
/