We do not have a product that does CDC from Informix.
If we can't implement CDC through informatica pwx, is there any other option which we can try for getting changed data from Informix.
If you have a insert/update date/time column in your tables, you could use that to find changes.
The question is: what methods does Informix provide to access undo / redo logs?
If there is an "official" method, we can most likely access this from PowerCenter in one or the other way.
If there is no such "official" method, then you should first contact Informix (resp. IBM, if memory serves me right) to ask them for any "external" access method to transaction logs.