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Keep only the latest version of duplicate ClickHouse event rows using ReplacingMergeTree and FINAL, without row-level UPDATE or DELETE.
Learn how to use ClickHouse ReplacingMergeTree for idempotent writes. This guide covers minimal design, the reality of eventual consistency, and how to verify deduplication.
Guide to decide which ClickHouse table engine fits your deduplication needs, with trade‑offs and a ready‑to‑run DDL example.
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.
Learn how to implement the ReplacingMergeTree engine in ClickHouse to handle data deduplication and updates without the performance penalty of standard UPDATE mutations.
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