Change Data Capture (CDC) in SAP Business Data Cloud (BDC)

What is Change Data Capture (CDC)?

Change Data Capture (CDC) is a mechanism that captures and processes only the data that has changed (inserts, updates, deletes) instead of reloading full datasets.

It enables:

Near real-time reporting
Reduced data volume movement
Better performance
Lower system load

Real Enterprise Scenario

A company wants:

Real-time revenue dashboard
Updated margin every 5 minutes
Inventory movement tracking

Full loads every hour would:
❌ Overload the system
❌ Increase latency
❌ Slow down reporting

👉 CDC is required.

How CDC Works in SAP BDC

CDC depends on source system capability.

🔹 1️⃣ CDC from SAP S/4HANA

Common approaches:

✔ CDS-based delta extraction
✔ ODP framework
✔ Log-based capture

Changes in:

ACDOCA
Sales orders
Material movements

Are captured incrementally and pushed to BDC.

🔹 2️⃣ CDC from SAP ECC

Since ECC is older:

✔ ODP extractors with delta queue
✔ SLT (log-based table replication)

SLT reads database logs and replicates changes in near real-time.

🔹 3️⃣ Ingestion into BDC

CDC data flows into:

Managed data foundation
Incremental processing pipelines
Partitioned storage

Deletes and updates are handled via:

Merge strategies
Upsert logic
Timestamp-based reconciliation

CDC Architecture Flow

S/4HANA / ECC ↓ Delta Capture (CDS / ODP / SLT) ↓ Change Log Processing ↓ BDC Incremental Load ↓ Semantic Layer Update ↓ SAC / AI / Reporting

Common CDC Interview Questions

What happens if delta queue fails?

Answer:

Perform delta re-initialization
Validate data reconciliation
Check source log consistency

How do you handle delete records?

Answer:

Soft delete flag
Change log tracking
Merge-based reconciliation

Benefits of CDC in BDC

✔ Near real-time analytics
✔ Lower network load
✔ Reduced storage consumption
✔ Faster dashboard refresh
✔ Better scalability

Performance Considerations

Partition by time
Avoid excessive micro-batching
Monitor delta queue size
Implement proper error handling

🔥 30-Second Interview Answer

In SAP Business Data Cloud, Change Data Capture enables incremental data replication from source systems like S/4HANA and ECC using CDS-based delta extraction, ODP, or SLT mechanisms. It ensures near real-time analytics while reducing system load and improving performance compared to full data loads.

You can also checkout ebooks for SAP BDC – Quick Revision – using the link :
Part 1 : https://topmate.io/vartika_gupta11/1954785

Part 2 : https://topmate.io/vartika_gupta11/1956232

Also can schedule a mock interview either by me or my team at topmate for SAP BDC – 35+ Minutes : https://topmate.io/vartika_gupta11/1962923

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