Thanks,
In my first question I would like to use xmin instead of cmin, even so I
could understand the logic.
Then for each XID you have 2 bilions XIDs that are considered lower than and
the other 2 bi higher than.
About row visibility: are all the rows with xmin higher than my XID be
considered in the future and not visible to my XID?
Thanks in advance!
Reimer