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#data-deduplication

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Blog19.2K views1,359 votes0 replies3,399 following

ReplacingMergeTree: Update & Deduplication in ClickHouse

ReplacingMergeTree lets you push updates into ClickHouse as new rows; the engine deduplicates older records during background merges. This post explains how it works, shows a hands‑on example, and outlines trade‑offs for OLAP workloads.

replacingmergetree

clickhouse data-deduplicationTasadduq Burneyowner34.8K rep · 27 Jan 2026, 02:46 UTC

Guide123.3K views4,279 votes

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4,696 following

Managing Data Updates in ClickHouse with ReplacingMergeTree

Learn how to implement the ReplacingMergeTree engine in ClickHouse to handle data deduplication and updates without the performance penalty of standard UPDATE mutations.

replacingmergetree

clickhouse data-deduplicationTasadduq Burneyowner34.8K rep · 06 Oct 2025, 23:58 UTC