SERVICE_NAMES

Property	Description
Parameter type	String
Syntax	`SERVICE_NAMES =` `db_service_name` `[,` `db_service_name` `[ ... ] ]`
Default value	`DB_UNIQUE_NAME.DB_DOMAIN` if defined
Modifiable	`ALTER SYSTEM`
Range of values	Any ASCII string or comma-separated list of string names
Basic	No
Real Application Clusters	You must set this parameter for every instance.

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.

You can specify multiple service names in order to distinguish among different uses of the same database. For example:

SERVICE_NAMES = sales.acme.com, widgetsales.acme.com

You can also use service names to identify a single service that is available from two different databases through the use of replication.

If you do not qualify the names in this parameter with a domain, Oracle qualifies them with the value of the DB_DOMAIN parameter. If DB_DOMAIN is not specified, then no domain will be applied to the non-qualified SERVICE_NAMES values.