Also I'm not asking for a database including every possible detail about a person. I see no reason why something like race, ethnicity, religion, sexuality, or an number of other traits should be recorded. But a simple database with names, DOB, most recent address, a national id, etc would be extremely helpful.

"Both Mayor Karrer and Bishop Chrysostomos were quickly summoned to appear before the German Commandant, where they were ordered to immediately prepare the list of all the Jewish residents of Zakynthos. ... In a great display of courage and defiance to the powerful occupiers of Greece, the mayor and the bishop handed a simple piece of paper to the Nazi commander. On that scrap of paper, only two names were written: Mayor Loukas Kerrer and Bishop Chrysostomos."

https://greece.greekreporter.com/2020/01/25/the-unimaginable...

"In the book, published in 2001, Black outlined the way in which IBM's technology helped facilitate Nazi genocide through generation and tabulation of punch cards based upon national census data."

I always find it strange how people consider the possibility of certain events far-fetched to the point of irrationality that have already happened.

Would the Holocaust have happened without IBM's participation?

Would the Holocaust have happened if punch cards were banned?

Would the Holocaust have happened if the Nazis didn't have census data?

The answer to those questions is an obvious yes. These logistical obstacles would have been nothing but a mild inconvenience for the Nazi death machine.