https://www.infoq.com InfoQ Columnar Databases feed https://www.infoq.com/news/2026/06/cloudflare-clickhouse-bottleneck/?utm_campaign=infoq_content&utm_source=infoq&utm_medium=feed&utm_term=Columnar+Databases <img src="https://res.infoq.com/news/2026/06/cloudflare-clickhouse-bottleneck/en/headerimage/generatedHeaderImage-1779253744444.jpg"/><p>Cloudflare recently described how a slowdown in its billing pipeline was traced to contention inside the query planning stage of ClickHouse. The team profiled the bottleneck and patched ClickHouse to replace an exclusive lock with a shared lock, drop the per-query copy of the parts list, and improve part filtering.</p> <i>By Renato Losio</i> Columnar Databases Data Partitioning Cloudflare Database ClickHouse AI, ML & Data Engineering Architecture & Design news Sat, 06 Jun 2026 04:55:00 GMT https://www.infoq.com/news/2026/06/cloudflare-clickhouse-bottleneck/?utm_campaign=infoq_content&utm_source=infoq&utm_medium=feed&utm_term=Columnar+Databases Renato Losio 2026-06-06T04:55:00Z /news/2026/06/cloudflare-clickhouse-bottleneck/en