Data & AI

Change Data Capture with Debezium

Data & AI Pipelines diagram · made in Skemio

Architecture diagram of Debezium reading PostgreSQL WAL transaction logs and publishing row-level change events to Apache Kafka topics for downstream sync.
Architecture diagram of Debezium reading PostgreSQL WAL transaction logs and publishing row-level change events to Apache Kafka topics for downstream sync.
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What it shows

  • Polling tables with SELECT queries creates table locks and read spikes.
  • Debezium tails the database transaction write-ahead log directly.
  • Row-level INSERT, UPDATE, and DELETE events stream in real time to Kafka.

The takeaway

CDC via transaction logs captures sub-second row changes with zero operational database query overhead.

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