CDC Replication Toolkit: CDC Replication Guide

CDC Replication Guide A comprehensive guide to setting up and operating change data capture pipelines with the CDC Replication Toolkit. By Datanest Digital Table of Contents What Is CDC? Debezium Setup Pipeline Architecture Configuration Walkthrough Schema Mapping Exactly-Once Delivery Schema Evolution Monitoring & Alerting Troubleshooting What Is CDC? Change Data Capture (CDC) is a pattern that tracks row-level changes (inserts, updates, deletes) in a source database and streams them to downstream systems. Instead of periodic full-table loads, CDC provides near-real-time replication with minimal source impact. Why CDC over batch ETL? Aspect Batch ETL CDC Latency Minutes to hours Seconds to minutes Source load High (full scans) Minimal (log reading) Data freshness Stale between loads Near real-time Delete detection Requires diff logic Native support Network traffic Entire table each run Only changes Debezium Setup Debezium is the most widely-used open-source CDC connector. It reads dat