Implement CDC from an OLTP database to a data warehouse
This tests your grasp of production system trade-offs. A good answer compares log-based and trigger-based CDC, focusing on source impact and data fidelity, then recommends log-based for its low overhead.
This tests your grasp of production system trade-offs, not just data patterns. A strong answer first acknowledges the 'minimal impact' constraint. Then, it contrasts log-based CDC (low impact, high fidelity, complex setup) with trigger-based CDC (high impact, simple setup). It concludes by recommending log-based CDC using a tool like Debezium as the superior choice for production OLTP systems. A red flag is proposing a simple query-based approach without highlighting its significant drawbacks, like missing deletes and high DB load.
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- #data engineering
- #cdc
- #systems design
- #databases
- #etl
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