For the Cognos part of IBM Connections together with an Oracle database you need to install the 32-bit Oracle database client on your Cognos node. Cognos is only supporting the “Runtime-Client” and not the smaller “InstantClient”, so make sure you
Error starting Cognos server with Oracle as database
After installing the Cognos server for IBM Connections 5.0 together with Oracle JDBC driver, Cognos did not start up although there was no error message in the SystemOut.log. However looking into the Cognos error log (“/opt/IBM/Cognos/CognosBI/logs/cogserver.log”) I saw the following error