There is an online resource that covers all the requirements for Cognos BI 10.2's installation. Since only one operating system can be selected at a time while considering installation of Cognos BI, the remaining requirements and prerequisites depend on the OS selected. Hence, to make combinations and see for supported environments and applications, the following link must be visited prior to purchasing Cognos BI and of course, prior to the installation and configuration activity:

http://publib.boulder.ibm.com/infocenter/prodguid/v1r0/clarity-reports/report/html/softwareReqsForProduct?deliverableId=1283262749193&osPlatform=Linux#