I try now to create the missing indexes. (The blocking is over.)
I believe it would be faster if we would stop the rendering for this time, but as I try it to use tirex-rendering-control, I got following error-message.
Greetings Tim
osm@ptolemy:~/tirex/bin$ ./tirex-rendering-control --stop cannot open configuration file '/etc/tirex/tirex.conf' at /home/project/o/s/m/osm/tirex/lib/vendor_perl/5.12/Tirex/Config.pm line 55.