Comment by t90fan

we had a 20 TB ballpark (so I would guess many tens or even hundreds of billions of rows for sure) postgres database at a place I worked in ~2015, hosted on-prem, I don't recall it causing them too much hassle, main thing I remember was the server had an very large amount of RAM (512GB which was loads and loads back then), and lots (for the time) of cores, something like 16, but was otherwise a fairly standard ~£50k ballpark piece of HP kit.