Tuesday, March 17, 2009

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

Do not set the SERVER_NAMES parameter for Real Application Clusters (RAC). Instead, define services using Database Configuration Assistant (DBCA) and manage services using Server Control (SRVCTL) utility.

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.

See Also:

  • Oracle Database Net Services Administrator's Guide for more information on this parameter and its settings
  • Oracle Real Application Clusters Administration and Deployment Guide for information about defining and administering services in a RAC environment
  • "DB_DOMAIN"

Note:

1. Clients wishing to connect to a SERVICE should use CONNECT_DATA which includes a SERVICE_NAME attribute rather than a SID. eg: (CONNECT_DATA=(SERVICE_NAME=widgetsales.acme.com))

2. Query for the current value of the parameter

select name, value, isdefault, isses_modifiable, issys_modifiable,

isinstance_modifiable, isdeprecated, description

from v$parameter

where upper(name) = 'SERVICE_NAMES';

NAME

VALUE

IS

DEFAULT

ISSES_

MODIFIABLE

ISSYS_

MODIFIABLE

ISINSTANCE_

MODIFIABLE

IS

DEPRECATED

DESCRIPTION

service_names

mydb.mycom.com

TRUE

FALSE

IMMEDIATE

TRUE

FALSE

service names supported by the instance

Oracle initializatoin parameters

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