Vlad, thank you very much for such detailed explanation.
Now i understand it as a whole.
 
And i see also why rollback increase CN (engine will undo all changes by tx4 
and mark it as committed).

>> RCRC transactions create snapshot when user query execution starts.
I see i miss „READ CONSISTENCY”in your sentence 😉

PS> i suppose, you could include such description in the documentation 😊

Thank you once again,
And good night

Regards,
Karol Bieniaszewski
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