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SERVICE_NAMES specifies one or more names by which clients can connect to the instance. The instance registers its service names with the listener. When a client requests a service, the listener determines which instances offer the requested service and routes the client to the appropriate instance.

What is the reason for I modify the parameter service_names like this

Service_names = 'service_one','service_two'

Rather than

Service_names = 'service_one'

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Because in the same database you have multiple applications, multiple workloads,... and services help to: - identify sessions when troubleshooting performance issue - manage resources for those with higher or lower priority - balance between several nodes - offload some read-only workloads to a standby database ...

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