What a Billion Database Rows Look Like in Real Life

A visual and conceptual exploration of what database scale looks like in physical terms. Starting from 50 rows on a single sheet of paper, the post scales up to a billion rows — equivalent to a two-kilometer-tall stack — and compares that to real-world data volumes from Spotify, Uber, and Facebook. Along the way, it explains core database concepts like indexes and joins using paper-stack analogies, illustrating why Postgres can retrieve a single row from billions in milliseconds. The post is sponsored by Supabase.