Hi Christian,
not sure whether this is still relevant but I thought I give an answer nevertheless.
I would go on and try to approach the situation like this (for a non-production system that is).
- switch off the automatic delta merge completely
- restart the instance
- Truncate or drop the table
To switch off the delta merge the parameter
indexserver.ini -> [mergedog] -> active
needs to be set to "no".
You could do this either via HANA studio (if you can connect to the instance, while the super long delta merge is processed). Or, in case you cannot access the Admin. perspective anymore, you might need to change the setting in the .ini file in the file system.
(/usr/sap/<SID>/SYS/exe/hdb/config -> indexserver.ini)
Once the indexserver is up, you can drop/truncate the table and re-enable the merge dog.
- Lars