IMO making and maintaining DBMS products isn’t one of SAP’s core business drivers. Never was, never should be. SAP’s strengths lie in a combination of building good application code, application development infrastructures, and abstraction layers for underlying common technologies like databases, spool mechanisms, TP monitors (ok this was more an R/2 thing) and so on, so that their application and technology products run on lots of platform / software combinations. SAP rescued ADABAS D (and renamed it SAP DB). I think that was a good move. They’re now sharing the technology and their support to an open source DB vendor with a good name.
As long as the relationship remains open source, what can be seen as bad about the partnership?