ClickHouse's query condition cache explained

Mark Needham, Product Marketing Engineer

Discover how ClickHouse 25.3's query condition cache dramatically improves query performance in this tutorial. Learn how this powerful feature caches filter results at the granule level, allowing ClickHouse to skip large portions of data during repeated queries with similar WHERE clauses.

We demonstrate the cache in action using a 100-million-row dataset, showing how query execution time drops from 0.8 seconds to just 50 milliseconds when the cache kicks in. You'll see how to inspect cache hits/misses using the query log, examine the condition cache's internal structure, and understand why this feature is particularly valuable for dashboarding and observability use cases.

Blog - https://clickhouse.com/blog/introducing-the-clickhouse-query-condition-cache