INSTANCE_NAME
Parameter type: String
Syntax INSTANCE_NAME = instance_id
Parameter class: Static
Default value: The instance’s SID
Note: The SID identifies the instance’s shared memory on a host,
but may not uniquely distinguish this instance from other
instances.
Allowable values: Any alphanumeric characters
In an Oracle Parallel Server environment, multiple instances can be associated with a single
database service. Clients can override Oracle’s connection load balancing by specifying a
particular instance by which to connect to the database. INSTANCE_NAME specifies the
unique name of this instance.
In a single-instance database system, the instance name is usually the same as the database
name.
See Also: Oracle8i Parallel Server Administration, Deployment, and Performance and Net8
Administrator’s Guide for more information.

SERVICE_NAMES
Parameter type: String
Syntax: SERVICE_NAMES =
db_service_name [, db_service_name [,...] ]
Parameter class: Static
Default value: DB_NAME.DB_DOMAIN if defined
Range of values: Any ASCII string or comma-separated list of string names
SERVICE_NAMES specifies one or more names for the database service to which this instance
connects. You can specify multiple services 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.
In an Oracle Parallel Server environment, you must set this parameter for every instance.
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, Oracle uses the
domain of your local database as it currently exists in the data dictionary.
See Also:
n Net8 Administrator’s Guide for more information on this parameter and its settings.
n  "DB_DOMAIN"  on page  1 - 28 .