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> This is exactly a great point. When data size goes to a billion rows, Postgres is tough. MongoDB just works without issue.

Is it though ? Maybe 5-10 years ago it was.

It is still true that vanilla Postgres doesn’t scale well beyond multiple machines. There are extensions that help, though.

My point is that you can handle a billion of rows on a single PostgreSQL instance.

Looking at the sheer number of rows isn’t really helpful - you’d need to know the query profile. Any database can simply store a billion rows.