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Problem connecting to a different database

Here we are using Oracle Enterprise Server 8.1.7. The problem is at a time, only one database is able to connect. So each time, I stop one database and start the other database. Please help on this.

On the server side, we have loaded following application software:

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1. W2K advanced server
2. Crystal enterprise 8.0
3. Crystal professional 8.5
4. Lotus client


To connect to a different database you'll need to set up your Network definitions properly. In your %ORACLE_HOME%\network\admin directory, there should be a file called TNSNAMES.ORA. If there is no such file, create one. Otherwise, open it up. Add an entry similar to this in that file:

db_name =
  (DESCRIPTION =
    (ADDRESS_LIST =
        (ADDRESS =
          (PROTOCOL = TCP)
          (Host = myhost)
          (Port = 1521)
        )
    )
    (CONNECT_DATA =
       (SID = db_name)
    )
  )
Make sure that you substitute values for "db_name" and "myhost". The SID is your database identifier uniquely identifying your different databases. Put a second entry for your second database similar to the above entry. Then save your TNSNAMES.ORA file.

Once that is done, to connect to a database, try the following from a DOS prompt:

sqlplus username@db_name
The tool will look up the "db_name" entry in your TNSNAMES.ORA file and use that information to find out how to connect to your database!

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This was first published in April 2002

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