In your database, you want to ensure that idle sessions that are blocking active are automatically terminated after a specified period of time. How would you accomplish this?
A.
Setting a metric threshold
B.
Implementing Database Resource Manager
C.
Enabling resumable timeout for user sessions
D.
Decreasing the value of the IDLE_TIME resource limit in the default profile
B is the answer.
https://docs.oracle.com/database/121/ADMIN/dbrm.htm#ADMIN027
Limit the amount of time that a session can be idle. This can be further defined to mean only sessions that are blocking other sessions.
Idle Time Limit
You can specify an amount of time that a session can be idle, after which it is terminated. You can also specify a more stringent idle time limit that applies to sessions that are idle and blocking other sessions
It cannot be D because not all the users have the default profil as their profil.
A user can have an other profile as his default profil. So it won't have effect on that user.
So i think the answer is B
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