In addition: i just found out that MaxDB has got a command autorecover, which should do the job to find complete and / or log backups to recreate the db state at the desired time. So i don't have to restore each of the > 15 log files manually.
I now entered:
autorecover until 20130128 080000
via dmbcli and at least i can see via lsof that the correct data backup from september has been chosen and is read. I will tell, if it worked or not.