Thank you both for your swift answer.
The reason I tried such large arrays is that I do not understand the way datatables work.
The whole subject of storing and retrieving data is unclear to me, just is importing and exporting data to PC.
I suppose that happens with beginners.
I tryed to follow the video about datatables (and some others) on utube. There I have a problem.
Since my hearing is somewhat impaired, I cannot fully understand what is said.
I followed a number of seminars, there I lost the thread very swiftly also.
The speed is very high, wich makes it worse. Repeated stop, wind back and replay made things not better, neither did half speed.
There was one video where there was subtitling during a short time. That cleared up things enormously.
I wonder if I am the only half deaf person using utube.
I will contact my contact at Unitronics. They are very helpfull, but I do not want to bother them more than I need to.