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CONFIGURING MAINTENANCE WINDOWS
http://docs.oracle.com/cd/E11882_01/server.112/e25494/tasks.htm#ADMIN12335
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select enabled, to_char(next_start_date,'YYYY-MM-DD_HH24:MI:SS') "NEXT_DATE" from all_scheduler_windows where window_name = 'SATURDAY_WINDOW';
select enabled, to_char(next_start_date,'YYYY-MM-DD_HH24:MI:SS') "NEXT_DATE" from all_scheduler_windows where window_name = 'SUNDAY_WINDOW';



BEGIN
  dbms_scheduler.disable(name  => 'SUNDAY_WINDOW');
END;
/

BEGIN
  dbms_scheduler.enable(name => 'SUNDAY_WINDOW');
END;
/