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Jul 23, 2026 · Databases

Building a PostgreSQL WAL‑Based CDC System: Principles and Engineering Implementation

This article explains how to capture and stream row‑level changes from PostgreSQL using its Write‑Ahead Log, compares the approach with MySQL binlog CDC, and provides a step‑by‑step guide—including configuration, logical decoding, snapshot handling, replication slots, and production‑grade correctness considerations—to build a reliable CDC pipeline.