About Modifying the SERVICE_NAMES Parameter for Oracle RAC

About Modifying the SERVICE_NAMES Parameter for Oracle RAC

The SERVICE_NAMES initialization parameter 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.

In an Oracle RAC database, you should not modify this parameter directly. Instead, define services for your database and database instances using the Clustered Managed Database Services page in Oracle Enterprise Manager. If you must change a service, then
you can use either Enterprise Manager or SRVCTL. When you use either Oracle Enterprise Manager or SRVCTL to create and start the service, the SERVICE_NAMES parameter is updated automatically once the service is active.

一言以蔽之，service_names在RAC中不能直接修改，如果要修改只能使用OEM或者srvctl进行修改！