Hi Steffen,
I am absolutely happy about your answer (and anyone helping in this forum of course) and like to thank you for the information given. I hope we are able to migrate soon, but there seem to be some difficulties concerning the compatibility of these versions (I am not involved in the software development 
).
Concerning the crash it would be helpful to have an option for instance to mark some or all indexes as bad, so the DB would not try to use them, so any form of option to modify the index table in admin mode.
I have uploaded some files to the SAP Box named above -- please note that there might be duplicates, since some files had been copied by myself and some are from the DIAGHISTORY.
Thank you again for your great effort,
Best regards,
Urs
P.S.: Why do those indexes get corrupted all the time anyway? Is this some kind of race condition?