Which statement about RAC services is correct?
A.
SYS$BACKGROUND and SYS$USERS are external services.
B.
Internal services can be deleted.
C.
Services are logical abstractions for managing workloads in Oracle Database.
D.
Every service has N-2 cluster resources (where N is the number of RAC instances).
Explanation:
A service is a logical grouping of sessions performing similar kind of work. They
enable you to group database workloads and route work to the optimal instances that are
assigned to offer the service.It is recommended that all the users who connect using a service
have the same service-level requirements. We can use services to manage workloads or a group
of applications. For example , all on-line users can use one service whereas batch users can use
another service and reporting can use yet another service.