Symbolic data server name for client applications

With this method, you create an interfaces file entry with a symbolic data server name for client applications.

The interfaces file might contain entries like these:

**Table 3-5: Symbolic data server name in interfaces file**
	Data server name	Host name	Port number
Client applications	CLIENT_DS	machine_1	2800
Active database	TOKYO_DS_X	machine_1	2800
Standby database	TOKYO_DS_Y	machine_2	2802

You could create an interfaces entry for a data server named CLIENT_DS. Client applications would always connect to CLIENT_DS. The CLIENT_DS entry would use the same host name and port number as the data server with the active database.

Replication Server connects to the same host name and port number as the client applications but uses a different data server name. In this example, Replication Server would switch between the TOKYO_DS_X and TOKYO_DS_Y data servers.

After switching the active database, you would change the CLIENT_DS interfaces entry to the host name and port number of the data server with the new active database—in this example, machine_2 and port number 2802.