Data ETL CDC Basics MCQ Questions with Answers (Latest 2026)

Q1. Which option best describes change data capture?

A. Pure batch dump. B. Pure cache eviction. C. Capture row-level changes from a source. D. Pure full reload.

Select an answer to check.

Answer: Capture row-level changes from a source.

Here, Capture row-level changes from a source. is the right choice. Incremental and low-latency. It aligns directly with what the question asks about which option best describes change data capture. A quick elimination of partially true options helps confirm it.

Q2. What is the primary purpose of change data capture?

A. Capture row-level changes from a source. B. Pure batch dump. C. Pure cache eviction. D. Pure full reload.

Select an answer to check.

Answer: Capture row-level changes from a source.

In this case, Capture row-level changes from a source. is correct. Incremental and low-latency. It aligns directly with what the question asks about what is the primary purpose of change data. A quick elimination of partially true options helps confirm it.

Q3. Which statement about change data capture is most accurate?

A. Pure cache eviction. B. Pure batch dump. C. Capture row-level changes from a source. D. Pure full reload.

Select an answer to check.

Answer: Capture row-level changes from a source.

The best option here is Capture row-level changes from a source.. Incremental and low-latency. It aligns directly with what the question asks about which statement about change data capture is most. A quick elimination of partially true options helps confirm it.

Q4. How is change data capture best characterized?

A. Capture row-level changes from a source. B. Pure batch dump. C. Pure cache eviction. D. Pure full reload.

Select an answer to check.

Answer: Capture row-level changes from a source.

For this question, Capture row-level changes from a source. is correct. Incremental and low-latency. It aligns directly with what the question asks about how is change data capture best characterized. A quick elimination of partially true options helps confirm it.

Q5. Which option best describes log-based CDC?

A. Trigger-based only. B. Snapshot-based only. C. Read DB transaction log for changes. D. Pure manual export.

Select an answer to check.

Answer: Read DB transaction log for changes.

Read DB transaction log for changes. is the correct answer here. Lower DB load. It aligns directly with what the question asks about which option best describes log-based cdc. A quick elimination of partially true options helps confirm it.

Q6. What is the primary purpose of log-based CDC?

A. Pure manual export. B. Snapshot-based only. C. Trigger-based only. D. Read DB transaction log for changes.

Select an answer to check.

Answer: Read DB transaction log for changes.

Here, Read DB transaction log for changes. is the right choice. Lower DB load. This matches the core idea being tested around what is the primary purpose of log-based cdc. A quick elimination of partially true options helps confirm it.

Q7. Which statement about log-based CDC is most accurate?

A. Read DB transaction log for changes. B. Trigger-based only. C. Pure manual export. D. Snapshot-based only.

Select an answer to check.

Answer: Read DB transaction log for changes.

In this case, Read DB transaction log for changes. is correct. Lower DB load. This matches the core idea being tested around which statement about log-based cdc is most accurate. A quick elimination of partially true options helps confirm it.

Q8. How is log-based CDC best characterized?

A. Trigger-based only. B. Read DB transaction log for changes. C. Snapshot-based only. D. Pure manual export.

Select an answer to check.

Answer: Read DB transaction log for changes.

The best option here is Read DB transaction log for changes.. Lower DB load. This matches the core idea being tested around how is log-based cdc best characterized. A quick elimination of partially true options helps confirm it.

Q9. Which option best describes trigger-based CDC?

A. DB triggers write change events to a side table. B. Pure full reload. C. Pure log-based. D. Pure manual export.

Select an answer to check.

Answer: DB triggers write change events to a side table.

For this question, DB triggers write change events to a side table. is correct. Adds DB overhead. This matches the core idea being tested around which option best describes trigger-based cdc. A quick elimination of partially true options helps confirm it.

Q10. What is the primary purpose of trigger-based CDC?

A. Pure full reload. B. DB triggers write change events to a side table. C. Pure manual export. D. Pure log-based.

Select an answer to check.

Answer: DB triggers write change events to a side table.

DB triggers write change events to a side table. is the correct answer here. Adds DB overhead. This matches the core idea being tested around what is the primary purpose of trigger-based cdc. A quick elimination of partially true options helps confirm it.

Q11. Which statement about trigger-based CDC is most accurate?

A. Pure full reload. B. Pure manual export. C. Pure log-based. D. DB triggers write change events to a side table.

Select an answer to check.

Answer: DB triggers write change events to a side table.

Here, DB triggers write change events to a side table. is the right choice. Adds DB overhead. That is exactly the concept behind which statement about trigger-based cdc is most accurate in this context. A quick elimination of partially true options helps confirm it.

Q12. How is trigger-based CDC best characterized?

A. Pure manual export. B. Pure log-based. C. Pure full reload. D. DB triggers write change events to a side table.

Select an answer to check.

Answer: DB triggers write change events to a side table.

In this case, DB triggers write change events to a side table. is correct. Adds DB overhead. That is exactly the concept behind how is trigger-based cdc best characterized in this context. A quick elimination of partially true options helps confirm it.

Q13. Which option best describes snapshot + incremental?

A. Always snapshot only. B. Initial full + ongoing CDC. C. Pure schema dump. D. Always incremental only.

Select an answer to check.

Answer: Initial full + ongoing CDC.

The best option here is Initial full + ongoing CDC.. Common bootstrap pattern. That is exactly the concept behind which option best describes snapshot + incremental in this context. A quick elimination of partially true options helps confirm it.

Q14. What is the primary purpose of snapshot + incremental?

A. Initial full + ongoing CDC. B. Always incremental only. C. Pure schema dump. D. Always snapshot only.

Select an answer to check.

Answer: Initial full + ongoing CDC.

For this question, Initial full + ongoing CDC. is correct. Common bootstrap pattern. That is exactly the concept behind what is the primary purpose of snapshot + in this context. A quick elimination of partially true options helps confirm it.

Q15. Which statement about snapshot + incremental is most accurate?

A. Pure schema dump. B. Always incremental only. C. Initial full + ongoing CDC. D. Always snapshot only.

Select an answer to check.

Answer: Initial full + ongoing CDC.

Initial full + ongoing CDC. is the correct answer here. Common bootstrap pattern. That is exactly the concept behind which statement about snapshot + incremental is most in this context. A quick elimination of partially true options helps confirm it.

Q16. How is snapshot + incremental best characterized?

A. Always snapshot only. B. Pure schema dump. C. Always incremental only. D. Initial full + ongoing CDC.

Select an answer to check.

Answer: Initial full + ongoing CDC.

Here, Initial full + ongoing CDC. is the right choice. Common bootstrap pattern. It fits the requirement in the prompt about how is snapshot + incremental best characterized. A quick elimination of partially true options helps confirm it.

Q17. Which option best describes Debezium?

A. Open-source CDC connector built on Kafka Connect. B. A pure ETL tool only. C. A pure log only. D. A pure cache.

Select an answer to check.

Answer: Open-source CDC connector built on Kafka Connect.

In this case, Open-source CDC connector built on Kafka Connect. is correct. Reads DB binlogs. It fits the requirement in the prompt about which option best describes debezium. A quick elimination of partially true options helps confirm it.

Q18. What is the primary purpose of Debezium?

A. A pure cache. B. A pure log only. C. Open-source CDC connector built on Kafka Connect. D. A pure ETL tool only.

Select an answer to check.

Answer: Open-source CDC connector built on Kafka Connect.

The best option here is Open-source CDC connector built on Kafka Connect.. Reads DB binlogs. It fits the requirement in the prompt about what is the primary purpose of debezium. A quick elimination of partially true options helps confirm it.

Q19. Which statement about Debezium is most accurate?

A. A pure ETL tool only. B. A pure log only. C. Open-source CDC connector built on Kafka Connect. D. A pure cache.

Select an answer to check.

Answer: Open-source CDC connector built on Kafka Connect.

For this question, Open-source CDC connector built on Kafka Connect. is correct. Reads DB binlogs. It fits the requirement in the prompt about which statement about debezium is most accurate. A quick elimination of partially true options helps confirm it.

Q20. How is Debezium best characterized?

A. A pure ETL tool only. B. Open-source CDC connector built on Kafka Connect. C. A pure log only. D. A pure cache.

Select an answer to check.

Answer: Open-source CDC connector built on Kafka Connect.

Open-source CDC connector built on Kafka Connect. is the correct answer here. Reads DB binlogs. It fits the requirement in the prompt about how is debezium best characterized. A quick elimination of partially true options helps confirm it.

Q21. Which option best describes Kafka Connect?

A. A pure web server. B. A pure cache. C. A pure ORM. D. Framework for source/sink connectors.

Select an answer to check.

Answer: Framework for source/sink connectors.

Here, Framework for source/sink connectors. is the right choice. Hosts CDC connectors. This is the most accurate statement for which option best describes kafka connect. A quick elimination of partially true options helps confirm it.

Q22. What is the primary purpose of Kafka Connect?

A. A pure cache. B. A pure web server. C. A pure ORM. D. Framework for source/sink connectors.

Select an answer to check.

Answer: Framework for source/sink connectors.

In this case, Framework for source/sink connectors. is correct. Hosts CDC connectors. This is the most accurate statement for what is the primary purpose of kafka connect. A quick elimination of partially true options helps confirm it.

Q23. Which statement about Kafka Connect is most accurate?

A. A pure web server. B. A pure cache. C. A pure ORM. D. Framework for source/sink connectors.

Select an answer to check.

Answer: Framework for source/sink connectors.

The best option here is Framework for source/sink connectors.. Hosts CDC connectors. This is the most accurate statement for which statement about kafka connect is most accurate. A quick elimination of partially true options helps confirm it.

Q24. How is Kafka Connect best characterized?

A. Framework for source/sink connectors. B. A pure web server. C. A pure ORM. D. A pure cache.

Select an answer to check.

Answer: Framework for source/sink connectors.

For this question, Framework for source/sink connectors. is correct. Hosts CDC connectors. This is the most accurate statement for how is kafka connect best characterized. A quick elimination of partially true options helps confirm it.

Q25. Which option best describes schema registry?

A. Stores Avro/Protobuf schemas for events. B. A pure metric store. C. A pure log. D. A pure cache.

Select an answer to check.

Answer: Stores Avro/Protobuf schemas for events.

Stores Avro/Protobuf schemas for events. is the correct answer here. Enables compatibility checks. This is the most accurate statement for which option best describes schema registry. A quick elimination of partially true options helps confirm it.

Q26. What is the primary purpose of schema registry?

A. A pure log. B. A pure metric store. C. Stores Avro/Protobuf schemas for events. D. A pure cache.

Select an answer to check.

Answer: Stores Avro/Protobuf schemas for events.

Here, Stores Avro/Protobuf schemas for events. is the right choice. Enables compatibility checks. It aligns directly with what the question asks about what is the primary purpose of schema registry. The other options are either incomplete or contextually incorrect.

Q27. Which statement about schema registry is most accurate?

A. A pure cache. B. A pure metric store. C. A pure log. D. Stores Avro/Protobuf schemas for events.

Select an answer to check.

Answer: Stores Avro/Protobuf schemas for events.

In this case, Stores Avro/Protobuf schemas for events. is correct. Enables compatibility checks. It aligns directly with what the question asks about which statement about schema registry is most accurate. The other options are either incomplete or contextually incorrect.

Q28. How is schema registry best characterized?

A. A pure metric store. B. Stores Avro/Protobuf schemas for events. C. A pure log. D. A pure cache.

Select an answer to check.

Answer: Stores Avro/Protobuf schemas for events.

The best option here is Stores Avro/Protobuf schemas for events.. Enables compatibility checks. It aligns directly with what the question asks about how is schema registry best characterized. The other options are either incomplete or contextually incorrect.

Q29. Which option best describes at-least-once CDC?

A. At-most-once. B. Always exactly-once. C. Pure best-effort. D. Events may be duplicated; sinks dedupe.

Select an answer to check.

Answer: Events may be duplicated; sinks dedupe.

For this question, Events may be duplicated; sinks dedupe. is correct. Common default. It aligns directly with what the question asks about which option best describes at-least-once cdc. The other options are either incomplete or contextually incorrect.

Q30. What is the primary purpose of at-least-once CDC?

A. Events may be duplicated; sinks dedupe. B. Pure best-effort. C. At-most-once. D. Always exactly-once.

Select an answer to check.

Answer: Events may be duplicated; sinks dedupe.

Events may be duplicated; sinks dedupe. is the correct answer here. Common default. It aligns directly with what the question asks about what is the primary purpose of at-least-once cdc. The other options are either incomplete or contextually incorrect.

Q31. Which statement about at-least-once CDC is most accurate?

A. At-most-once. B. Events may be duplicated; sinks dedupe. C. Pure best-effort. D. Always exactly-once.

Select an answer to check.

Answer: Events may be duplicated; sinks dedupe.

Here, Events may be duplicated; sinks dedupe. is the right choice. Common default. This matches the core idea being tested around which statement about at-least-once cdc is most accurate. The other options are either incomplete or contextually incorrect.

Q32. How is at-least-once CDC best characterized?

A. At-most-once. B. Events may be duplicated; sinks dedupe. C. Pure best-effort. D. Always exactly-once.

Select an answer to check.

Answer: Events may be duplicated; sinks dedupe.

In this case, Events may be duplicated; sinks dedupe. is correct. Common default. This matches the core idea being tested around how is at-least-once cdc best characterized. The other options are either incomplete or contextually incorrect.

Q33. Which option best describes ordering guarantees?

A. Pure global ordering always. B. No ordering. C. Per-partition or per-key ordering. D. Random reordering.

Select an answer to check.

Answer: Per-partition or per-key ordering.

The best option here is Per-partition or per-key ordering.. Important for state correctness. This matches the core idea being tested around which option best describes ordering guarantees. The other options are either incomplete or contextually incorrect.

Q34. What is the primary purpose of ordering guarantees?

A. Pure global ordering always. B. Per-partition or per-key ordering. C. Random reordering. D. No ordering.

Select an answer to check.

Answer: Per-partition or per-key ordering.

For this question, Per-partition or per-key ordering. is correct. Important for state correctness. This matches the core idea being tested around what is the primary purpose of ordering guarantees. The other options are either incomplete or contextually incorrect.

Q35. Which statement about ordering guarantees is most accurate?

A. Random reordering. B. No ordering. C. Pure global ordering always. D. Per-partition or per-key ordering.

Select an answer to check.

Answer: Per-partition or per-key ordering.

Per-partition or per-key ordering. is the correct answer here. Important for state correctness. This matches the core idea being tested around which statement about ordering guarantees is most accurate. The other options are either incomplete or contextually incorrect.

Q36. How is ordering guarantees best characterized?

A. No ordering. B. Pure global ordering always. C. Random reordering. D. Per-partition or per-key ordering.

Select an answer to check.

Answer: Per-partition or per-key ordering.

Here, Per-partition or per-key ordering. is the right choice. Important for state correctness. That is exactly the concept behind how is ordering guarantees best characterized in this context. The other options are either incomplete or contextually incorrect.

Q37. Which option best describes idempotent sink?

A. Random upsert. B. De-duplicates by key + version/LSN. C. Pure logs only. D. Insert blindly always.

Select an answer to check.

Answer: De-duplicates by key + version/LSN.

In this case, De-duplicates by key + version/LSN. is correct. Critical for CDC correctness. That is exactly the concept behind which option best describes idempotent sink in this context. The other options are either incomplete or contextually incorrect.

Q38. What is the primary purpose of idempotent sink?

A. Insert blindly always. B. Pure logs only. C. De-duplicates by key + version/LSN. D. Random upsert.

Select an answer to check.

Answer: De-duplicates by key + version/LSN.

The best option here is De-duplicates by key + version/LSN.. Critical for CDC correctness. That is exactly the concept behind what is the primary purpose of idempotent sink in this context. The other options are either incomplete or contextually incorrect.

Q39. Which statement about idempotent sink is most accurate?

A. Random upsert. B. De-duplicates by key + version/LSN. C. Pure logs only. D. Insert blindly always.

Select an answer to check.

Answer: De-duplicates by key + version/LSN.

For this question, De-duplicates by key + version/LSN. is correct. Critical for CDC correctness. That is exactly the concept behind which statement about idempotent sink is most accurate in this context. The other options are either incomplete or contextually incorrect.

Q40. How is idempotent sink best characterized?

A. Random upsert. B. Pure logs only. C. De-duplicates by key + version/LSN. D. Insert blindly always.

Select an answer to check.

Answer: De-duplicates by key + version/LSN.

De-duplicates by key + version/LSN. is the correct answer here. Critical for CDC correctness. That is exactly the concept behind how is idempotent sink best characterized in this context. The other options are either incomplete or contextually incorrect.

Q41. Which option best describes a tombstone event?

A. Indicates row deletion. B. A pure metric. C. A pure cache flush. D. A pure log entry.

Select an answer to check.

Answer: Indicates row deletion.

Here, Indicates row deletion. is the right choice. Sink applies as DELETE. It fits the requirement in the prompt about which option best describes a tombstone event. The other options are either incomplete or contextually incorrect.

Q42. What is the primary purpose of a tombstone event?

A. A pure cache flush. B. A pure metric. C. Indicates row deletion. D. A pure log entry.

Select an answer to check.

Answer: Indicates row deletion.

In this case, Indicates row deletion. is correct. Sink applies as DELETE. It fits the requirement in the prompt about what is the primary purpose of a tombstone. The other options are either incomplete or contextually incorrect.

Q43. Which statement about a tombstone event is most accurate?

A. A pure cache flush. B. A pure log entry. C. Indicates row deletion. D. A pure metric.

Select an answer to check.

Answer: Indicates row deletion.

The best option here is Indicates row deletion.. Sink applies as DELETE. It fits the requirement in the prompt about which statement about a tombstone event is most. The other options are either incomplete or contextually incorrect.

Q44. How is a tombstone event best characterized?

A. A pure metric. B. A pure cache flush. C. A pure log entry. D. Indicates row deletion.

Select an answer to check.

Answer: Indicates row deletion.

For this question, Indicates row deletion. is correct. Sink applies as DELETE. It fits the requirement in the prompt about how is a tombstone event best characterized. The other options are either incomplete or contextually incorrect.

Q45. Which option best describes LSN/SCN/binlog position?

A. A schema constraint. B. A retry counter. C. Sequence identifier of changes. D. A column index.

Select an answer to check.

Answer: Sequence identifier of changes.

Sequence identifier of changes. is the correct answer here. Used for resume points. It fits the requirement in the prompt about which option best describes lsn/scn/binlog position. The other options are either incomplete or contextually incorrect.

Q46. What is the primary purpose of LSN/SCN/binlog position?

A. A retry counter. B. A schema constraint. C. Sequence identifier of changes. D. A column index.

Select an answer to check.

Answer: Sequence identifier of changes.

Here, Sequence identifier of changes. is the right choice. Used for resume points. This is the most accurate statement for what is the primary purpose of lsn/scn/binlog position. The other options are either incomplete or contextually incorrect.

Q47. Which statement about LSN/SCN/binlog position is most accurate?

A. A schema constraint. B. A column index. C. Sequence identifier of changes. D. A retry counter.

Select an answer to check.

Answer: Sequence identifier of changes.

In this case, Sequence identifier of changes. is correct. Used for resume points. This is the most accurate statement for which statement about lsn/scn/binlog position is most accurate. The other options are either incomplete or contextually incorrect.

Q48. How is LSN/SCN/binlog position best characterized?

A. A schema constraint. B. A column index. C. A retry counter. D. Sequence identifier of changes.

Select an answer to check.

Answer: Sequence identifier of changes.

The best option here is Sequence identifier of changes.. Used for resume points. This is the most accurate statement for how is lsn/scn/binlog position best characterized. The other options are either incomplete or contextually incorrect.

Q49. Which option best describes snapshot consistency?

A. No consistency. B. Random consistency. C. Initial snapshot consistent with a starting LSN. D. Pure index rebuild.

Select an answer to check.

Answer: Initial snapshot consistent with a starting LSN.

For this question, Initial snapshot consistent with a starting LSN. is correct. Avoids gaps after switching to streaming. This is the most accurate statement for which option best describes snapshot consistency. The other options are either incomplete or contextually incorrect.

Q50. What is the primary purpose of snapshot consistency?

A. Random consistency. B. Pure index rebuild. C. No consistency. D. Initial snapshot consistent with a starting LSN.

Select an answer to check.

Answer: Initial snapshot consistent with a starting LSN.

Initial snapshot consistent with a starting LSN. is the correct answer here. Avoids gaps after switching to streaming. This is the most accurate statement for what is the primary purpose of snapshot consistency. The other options are either incomplete or contextually incorrect.