High Cardinality in ClickHouse at Scale: What Actually Breaks
ClickHouse swallows high-cardinality telemetry at ingest, then breaks at query time weeks later. Here is what fails, and how we keep it fast in production.
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Prathamesh Sonpatki
ClickHouse LowCardinality: When It Helps and When It Hurts
ClickHouse LowCardinality cuts storage and speeds up queries on low-cardinality columns, but backfires on trace IDs. How to tell the difference.
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Prathamesh Sonpatki