InterFace bei den OBJEKTspektrum Information Days

I was a software engineer, heavily involved in testing system software, including design and planning of testing. As such, I see this talk as interesting for project managers, rather than for software engineers. The technical problems are not enough covered for me. Perhaps these days every programmer knows about the problems of migrating from Informix to Oracle, but I do not. Sixty-five „products“ are mentioned. Can we assume that products do not share data with each other, so that they can be migrated fairly independently? Or must clever methods be used to avoid going live in big-bang mode? There are similar fundamental questions concerning performance testing, for instance whether the system can be taken over at nights, or does it run all the time.
It is understandable that management problems are at the forefront at the end of the project, rather than the essential technical aspects that need to be considered at the start.