1.161 INSTANCE_NAME
In an Oracle Real Application Clusters 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.| Property | Description | 
|---|---|
| Parameter type | String | 
| Syntax | 
 | 
| 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. | 
| Modifiable | No | 
| Modifiable in a PDB | No | 
| Range of values | Alphanumeric ASCII characters and the underscore (_) character, up to a maximum of 255 characters | 
| Basic | No | 
In a single-instance database system, the instance name is usually the same as the database name.
See Also:
Oracle Real Application Clusters Administration and Deployment Guide and Oracle Database Net Services Administrator's Guide for more information