First, I've moved this post to a more appropriate forum...
Second... You'll have to give us some more information, and describe the situation you're asking about. I'm not sure what you're asking. When you say 'retrieval and Data Migration'... what Data Migration? From where? By which process/tool?
Help us to help you by giving us as much background as you reasonably can, tell us what you're expecting, and how it's different from what's happening, or the problem you're trying to solve.
-JD.