Thanks for the help. When I start the process I can see that the used RAM by ArcMap is getting more and more. Do I have a chance to avoid the increasing use of the RAM by ArcMap? But there's another thing: Even though I have enough RAM left, the process is getting slower over the time. At first it says about 0,2 sec elapsed time, 20 mintutes later it is about 0,8 sec elapsed time.
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