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ClickHouse Buffers the Query Log and Flushes It Into a Real MergeTree Table

Oct 24, 2026 17 min read Jay Hubbert

The query log is an in-memory queue drained every 7.5 seconds by a background thread that INSERTs into a lazily created MergeTree table.

ClickhouseInternalsSystem tablesObservabilityPerformance

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