ClickHouse speed layer for real time data
AI program manager at AstraZeneca on running self-hosted ClickHouse
The key distinction is that ClickHouse was built around fresh event data as the main job, not as an add on to a warehouse. In practice that means teams can keep pouring in logs, clicks, metrics, and model signals while still serving sub second SQL over the newest rows. At AstraZeneca, that made ClickHouse the speed layer for agentic AI and live retrieval, while Snowflake stayed the system for heavier transformations, governance, and reporting.
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The workflow fit is different. ClickHouse is strongest when data arrives as an endless stream of append only events and users want dashboards, logs, or retrieval results immediately. Snowflake now supports low latency ingestion, but its own docs frame this as near real time, with data available within seconds, not as a system purpose built around ultra low latency queries on hot event streams.
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The closest competitors are not classic warehouses, but specialized engines like Firebolt, Druid, Pinot, and formerly Rockset. Even there, ClickHouse stands out because it pairs very high ingest and query speed with open source adoption and broad use in observability and embedded analytics, which is why companies like AstraZeneca run it themselves despite the cluster tuning and upgrade work.
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That performance edge comes from concrete tradeoffs. ClickHouse is optimized for columnar scans, compression, sparse indexing, and append heavy workloads. The same design makes it weaker for deep joins, frequent upserts, and strict transactional consistency, which is why enterprises often pair it with Snowflake or Postgres instead of replacing those systems outright.
This market is moving toward a split stack. Warehouses like Snowflake are adding faster ingestion, and open table formats reduce switching costs, but the fastest event analytics workloads are still pulling toward engines built for speed first. The next phase is ClickHouse expanding from an engineer run speed layer into a more complete enterprise product with easier cloud operations and stronger compliance features.