本文探讨了Oracle资源管理器中服务与程序、用户、会话及应用的关联方式，通过这种方式可以实现按服务管理资源利用率。此外，在RAC环境中，服务作为故障转移的关键因素，确保连接到存活或空闲实例而非特定实例。
https://forums.oracle.com/thread/540986?start=0&tstart=0
Discussions in this post explain the concepts of sid and service well.
Here're some important notes:
1. With Oracle Resource Manager, it becomes interesting to associate a program, user, session or application with a service. It is then possible to manage the resource utilitization on a per-service basis.
2. In RAC, service is key to failover. Instead of connecting to a specific instance, you're connected to a surviving and/or idle instance.
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