The main production system, where I do the administrative work grew a lot in the last years ==> many surveys (=20) with a lot of questions (each 20 to 80) and much more answers (each 500 to 25.000).

1) A manual Update from eg. 1.87+ to 1.90+ failed, because the max_execution_time, which was needed to transform the question types was only possible after setting the value to more than 300sec ==> this value was so high, that I had a serious problem with my provider!

2) A comfort update from 1.90+ to another 1.90+ is not possible, because I get an error from dumbdb because of low memory; but the notification is very strange: the displayed limit for max memory is lower than the amount of memory taken by dumpdb.