Notes on ClickHouse, analytics and retail reporting — from someone who tunes them for a living.https://kz1.dev/https://kz1.dev/blog/clickhouse-join-not-slow-because-tables-are-big/https://kz1.dev/blog/clickhouse-join-not-slow-because-tables-are-big/A 6M x 20M join restarted our server, and a dead FINAL join cost a listing page 2.7 GiB of RAM. Neither was about row count.Wed, 29 Jul 2026 00:00:00 GMT