Oracle如何定时启动job

begin
  sys.dbms_job.submit(job => :job,
                      what => 'P_customer_entry_time;',
                      next_date => to_date('2009-08-15 22:00:00', 'yyyy-mm-dd 24HH:MI:SS'),
                      interval => 'trunc(sysdate+1)+22/24');
  commit;
end;