You may encounter problems connecting with an Oracle 7 client to an Oracle9i database (this is no longer supported), but the Oracle9i client should be able to connect to the Oracle9i database if configured correctly.
To connect from a client to a remote database, you will need the following components:
- A current tnsnames.ora file on the client -- this usually resides in the network/admin folder under wherever you have installed the Oracle client software. The tnsnames.ora file contains descriptor information for the service name of your remote database. This includes host name or IP address of the server where the database resides.
- You may also require a sqlnet.ora file.
- On the remote database server, a listener must be running and listening for connections to your database. The listener will enable connections to the database from the client, provided the correct username and password are used.
This was first published in April 2006