SERVICE_NAMES specifies one or more names by which clients can connect to the instance.

Property Description

Parameter type




db_service_name [, db_service_name [ ... ] ]

Default value




Modifiable in a PDB


Range of values

Any ASCII string or comma-separated list of string names



Oracle RAC

Do not set the SERVICE_NAMES parameter for Oracle RAC environments. Instead, define services using Oracle Enterprise Manager and manage those services using Server Control (SRVCTL) utility.

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 to distinguish among different uses of the same database. For example:

SERVICE_NAMES = sales.example.com, widgetsales.example.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.

When you specify additional service names with this parameter, the default service name is not overridden. The default service name plus the additional service names specified with this parameter are the service names that clients can use to connect to the database.


The SERVICE_NAMES initialization parameter is deprecated in Oracle Database 19c and may be desupported in a future release.

Use of the SERVICE_NAMES parameter is no longer actively supported. It must not be used for high availability (HA) deployments and it is not supported for HA operations. This restriction includes FAN, load balancing, FAILOVER_TYPE, FAILOVER_RESTORE, SESSION_STATE_CONSISTENCY, and any other uses.

To manage your services, Oracle recommends that you instead use the SRVCTL command-line utility, the GDSCTL command-line utility, or the DBMS_SERVICE PL/SQL package.

See Also: