In general if you are talking about having the code show up in the Source tab of a JIRA issue then it shouldn't be a problem when you integrate JIRA with a FishEye repository. I'm not exactly sure how you work with DB2 code files, is it that something you commit to a CVS? If so then using the SVN included with your subscription you should be fine.
You can more information about this OnDemand subscription here: http://www.atlassian.com/licensing/fisheye#ondemandsubscriptions-1 .
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