Which three statements are true about windows? (Choose three.)
A.
Only one window can be open at any given time
B.
Consumer groups are associated with windows
C.
Windows work with job classes to control resource allocation
D.
The database service name must be provided during windows creation
E.
Windows can automatically start job or change resource allocation among jobs for various
time periods.
A,C,E are correct:
https://docs.oracle.com/cd/B19306_01/server.102/b14231/scheduse.htm
A: Only one window can be in effect at any given time. Windows belong to the SYS schema.
C:Allocating Resources Among Jobs
It is not practical to manage resource allocation at an individual job level, therefore, the Scheduler uses the concept of job classes to manage resource allocation among jobs. In addition to job classes, the Scheduler uses the Resource Manager to manage resource allocation among jobs.
E: When the force option is set to TRUE, the Scheduler automatically closes any window that is open at that time, even if it has a higher priority. For the duration of this manually opened window, the Scheduler does not open any other scheduled windows even if they have a higher priority. You can open a window that is already open. In this case, the window stays open for the duration specified in the call, from the time the OPEN_WINDOW command was issued.