Change Oracle IP

Question

If I change Oracle database server IP , what problems may be caused and how to solve them?

1. modify hosts file
2. modify tnsnames.ora file
3. modify listener.ora file
4. modify clients' tnsnames.ora files

As I know it is not necessary to have listener.ora and tnsnames.ora files on the database server; it is necessary if you need to connect to another database. Am I right?

I have single-instance database, version 11.2.0.1.0

Answer 1

None of what you have listed as required is necessary if you use fully qualified domain names in the TNSNAMES and client TNSNAMES files, and you are using a Windows domain.

This is the reason why hard coding IP addresses is a maintenance headache. Instead of:

MY_DB=   (DESCRIPTION=
    (ADDRESS=
      (PROTOCOL=TCP)
      (HOST=192.168.0.2)
      (PORT=1521)
    )
    (CONNECT_DATA=
      (SERVICE_NAME=MY_DB.HOME.LOCAL)
    )   )

Use:

MY_DB=   (DESCRIPTION=
    (ADDRESS=
      (PROTOCOL=TCP)
      (HOST=DB_MACHINE_NAME.HOME.LOCAL)
      (PORT=1521)
    )
    (CONNECT_DATA=
      (SERVICE_NAME=MY_DB.HOME.LOCAL)
    )   )