Data ETL Incremental Loads MCQ Questions with Answers – Page 2 (Latest 2026)
Practice Data ETL Incremental Loads MCQ questions with detailed explanations and clear answer validation. These MCQs help you revise core concepts, compare close options, and improve accuracy for interviews, certification exams, and technical screening rounds. Use this updated 2026 set to strengthen fundamentals and confidence.
Q51. Which statement about checkpointing watermarks is most accurate?
Select an answer to check.
Answer: Persist watermark per source/run.
Here, Persist watermark per source/run. is the right choice. Required for resume. It aligns directly with what the question asks about which statement about checkpointing watermarks is most accurate. Competing choices sound plausible, but they miss the key condition.
Q52. How is checkpointing watermarks best characterized?
Select an answer to check.
Answer: Persist watermark per source/run.
In this case, Persist watermark per source/run. is correct. Required for resume. It aligns directly with what the question asks about how is checkpointing watermarks best characterized. Competing choices sound plausible, but they miss the key condition.
Q53. Which option best describes exactly-once load?
Select an answer to check.
Answer: Each change applied once at target.
The best option here is Each change applied once at target.. Use idempotency keys. It aligns directly with what the question asks about which option best describes exactly-once load. Competing choices sound plausible, but they miss the key condition.
Q54. What is the primary purpose of exactly-once load?
Select an answer to check.
Answer: Each change applied once at target.
For this question, Each change applied once at target. is correct. Use idempotency keys. It aligns directly with what the question asks about what is the primary purpose of exactly-once load. Competing choices sound plausible, but they miss the key condition.
Q55. Which statement about exactly-once load is most accurate?
Select an answer to check.
Answer: Each change applied once at target.
Each change applied once at target. is the correct answer here. Use idempotency keys. It aligns directly with what the question asks about which statement about exactly-once load is most accurate. Competing choices sound plausible, but they miss the key condition.
Q56. How is exactly-once load best characterized?
Select an answer to check.
Answer: Each change applied once at target.
Here, Each change applied once at target. is the right choice. Use idempotency keys. This matches the core idea being tested around how is exactly-once load best characterized. Competing choices sound plausible, but they miss the key condition.
Q57. Which option best describes ordering by key?
Select an answer to check.
Answer: Apply changes in order per key.
In this case, Apply changes in order per key. is correct. Avoids stale-overrides-fresh. This matches the core idea being tested around which option best describes ordering by key. Competing choices sound plausible, but they miss the key condition.
Q58. What is the primary purpose of ordering by key?
Select an answer to check.
Answer: Apply changes in order per key.
The best option here is Apply changes in order per key.. Avoids stale-overrides-fresh. This matches the core idea being tested around what is the primary purpose of ordering by. Competing choices sound plausible, but they miss the key condition.
Q59. Which statement about ordering by key is most accurate?
Select an answer to check.
Answer: Apply changes in order per key.
For this question, Apply changes in order per key. is correct. Avoids stale-overrides-fresh. This matches the core idea being tested around which statement about ordering by key is most. Competing choices sound plausible, but they miss the key condition.
Q60. How is ordering by key best characterized?
Select an answer to check.
Answer: Apply changes in order per key.
Apply changes in order per key. is the correct answer here. Avoids stale-overrides-fresh. This matches the core idea being tested around how is ordering by key best characterized. Competing choices sound plausible, but they miss the key condition.
Q61. Which option best describes schema evolution during incremental?
Select an answer to check.
Answer: Add columns without breaking pipeline.
Here, Add columns without breaking pipeline. is the right choice. Schema-on-read or evolutionary DDL. That is exactly the concept behind which option best describes schema evolution during incremental in this context. Competing choices sound plausible, but they miss the key condition.
Q62. What is the primary purpose of schema evolution during incremental?
Select an answer to check.
Answer: Add columns without breaking pipeline.
In this case, Add columns without breaking pipeline. is correct. Schema-on-read or evolutionary DDL. That is exactly the concept behind what is the primary purpose of schema evolution in this context. Competing choices sound plausible, but they miss the key condition.
Q63. Which statement about schema evolution during incremental is most accurate?
Select an answer to check.
Answer: Add columns without breaking pipeline.
The best option here is Add columns without breaking pipeline.. Schema-on-read or evolutionary DDL. That is exactly the concept behind which statement about schema evolution during incremental is in this context. Competing choices sound plausible, but they miss the key condition.
Q64. How is schema evolution during incremental best characterized?
Select an answer to check.
Answer: Add columns without breaking pipeline.
For this question, Add columns without breaking pipeline. is correct. Schema-on-read or evolutionary DDL. That is exactly the concept behind how is schema evolution during incremental best characterized in this context. Competing choices sound plausible, but they miss the key condition.
Q65. Which option best describes CDC vs incremental query?
Select an answer to check.
Answer: Log-based vs SQL-based incrementals.
Log-based vs SQL-based incrementals. is the correct answer here. Different trade-offs. That is exactly the concept behind which option best describes cdc vs incremental query in this context. Competing choices sound plausible, but they miss the key condition.
Q66. What is the primary purpose of CDC vs incremental query?
Select an answer to check.
Answer: Log-based vs SQL-based incrementals.
Here, Log-based vs SQL-based incrementals. is the right choice. Different trade-offs. It fits the requirement in the prompt about what is the primary purpose of cdc vs. Competing choices sound plausible, but they miss the key condition.
Q67. Which statement about CDC vs incremental query is most accurate?
Select an answer to check.
Answer: Log-based vs SQL-based incrementals.
In this case, Log-based vs SQL-based incrementals. is correct. Different trade-offs. It fits the requirement in the prompt about which statement about cdc vs incremental query is. Competing choices sound plausible, but they miss the key condition.
Q68. How is CDC vs incremental query best characterized?
Select an answer to check.
Answer: Log-based vs SQL-based incrementals.
The best option here is Log-based vs SQL-based incrementals.. Different trade-offs. It fits the requirement in the prompt about how is cdc vs incremental query best characterized. Competing choices sound plausible, but they miss the key condition.
Q69. Which option best describes partition pruning?
Select an answer to check.
Answer: Skip partitions not in range.
For this question, Skip partitions not in range. is correct. Cuts query cost. It fits the requirement in the prompt about which option best describes partition pruning. Competing choices sound plausible, but they miss the key condition.
Q70. What is the primary purpose of partition pruning?
Select an answer to check.
Answer: Skip partitions not in range.
Skip partitions not in range. is the correct answer here. Cuts query cost. It fits the requirement in the prompt about what is the primary purpose of partition pruning. Competing choices sound plausible, but they miss the key condition.
Q71. Which statement about partition pruning is most accurate?
Select an answer to check.
Answer: Skip partitions not in range.
Here, Skip partitions not in range. is the right choice. Cuts query cost. This is the most accurate statement for which statement about partition pruning is most accurate. Competing choices sound plausible, but they miss the key condition.
Q72. How is partition pruning best characterized?
Select an answer to check.
Answer: Skip partitions not in range.
In this case, Skip partitions not in range. is correct. Cuts query cost. This is the most accurate statement for how is partition pruning best characterized. Competing choices sound plausible, but they miss the key condition.
Q73. Which option best describes data freshness?
Select an answer to check.
Answer: Time since last successful load.
The best option here is Time since last successful load.. Customer-facing SLO. This is the most accurate statement for which option best describes data freshness. Competing choices sound plausible, but they miss the key condition.
Q74. What is the primary purpose of data freshness?
Select an answer to check.
Answer: Time since last successful load.
For this question, Time since last successful load. is correct. Customer-facing SLO. This is the most accurate statement for what is the primary purpose of data freshness. Competing choices sound plausible, but they miss the key condition.
Q75. Which statement about data freshness is most accurate?
Select an answer to check.
Answer: Time since last successful load.
Time since last successful load. is the correct answer here. Customer-facing SLO. This is the most accurate statement for which statement about data freshness is most accurate. Competing choices sound plausible, but they miss the key condition.
Q76. How is data freshness best characterized?
Select an answer to check.
Answer: Time since last successful load.
Here, Time since last successful load. is the right choice. Customer-facing SLO. It aligns directly with what the question asks about how is data freshness best characterized. The remaining choices fail because they don’t satisfy the full definition.
Q77. Which option best describes late-binding watermarks?
Select an answer to check.
Answer: Adjust watermark only after dependencies confirmed.
In this case, Adjust watermark only after dependencies confirmed. is correct. Avoids missing late records. It aligns directly with what the question asks about which option best describes late-binding watermarks. The remaining choices fail because they don’t satisfy the full definition.
Q78. What is the primary purpose of late-binding watermarks?
Select an answer to check.
Answer: Adjust watermark only after dependencies confirmed.
The best option here is Adjust watermark only after dependencies confirmed.. Avoids missing late records. It aligns directly with what the question asks about what is the primary purpose of late-binding watermarks. The remaining choices fail because they don’t satisfy the full definition.
Q79. Which statement about late-binding watermarks is most accurate?
Select an answer to check.
Answer: Adjust watermark only after dependencies confirmed.
For this question, Adjust watermark only after dependencies confirmed. is correct. Avoids missing late records. It aligns directly with what the question asks about which statement about late-binding watermarks is most accurate. The remaining choices fail because they don’t satisfy the full definition.
Q80. How is late-binding watermarks best characterized?
Select an answer to check.
Answer: Adjust watermark only after dependencies confirmed.
Adjust watermark only after dependencies confirmed. is the correct answer here. Avoids missing late records. It aligns directly with what the question asks about how is late-binding watermarks best characterized. The remaining choices fail because they don’t satisfy the full definition.
Q81. Which option best describes watermark vs offset?
Select an answer to check.
Answer: Watermark = data time; offset = position in log.
Here, Watermark = data time; offset = position in log. is the right choice. Both used in streaming. This matches the core idea being tested around which option best describes watermark vs offset. The remaining choices fail because they don’t satisfy the full definition.
Q82. What is the primary purpose of watermark vs offset?
Select an answer to check.
Answer: Watermark = data time; offset = position in log.
In this case, Watermark = data time; offset = position in log. is correct. Both used in streaming. This matches the core idea being tested around what is the primary purpose of watermark vs. The remaining choices fail because they don’t satisfy the full definition.
Q83. Which statement about watermark vs offset is most accurate?
Select an answer to check.
Answer: Watermark = data time; offset = position in log.
The best option here is Watermark = data time; offset = position in log.. Both used in streaming. This matches the core idea being tested around which statement about watermark vs offset is most. The remaining choices fail because they don’t satisfy the full definition.
Q84. How is watermark vs offset best characterized?
Select an answer to check.
Answer: Watermark = data time; offset = position in log.
For this question, Watermark = data time; offset = position in log. is correct. Both used in streaming. This matches the core idea being tested around how is watermark vs offset best characterized. The remaining choices fail because they don’t satisfy the full definition.
Q85. Which option best describes dead-letter queue?
Select an answer to check.
Answer: Hold malformed/failed records.
Hold malformed/failed records. is the correct answer here. Operability. This matches the core idea being tested around which option best describes dead-letter queue. The remaining choices fail because they don’t satisfy the full definition.
Q86. What is the primary purpose of dead-letter queue?
Select an answer to check.
Answer: Hold malformed/failed records.
Here, Hold malformed/failed records. is the right choice. Operability. That is exactly the concept behind what is the primary purpose of dead-letter queue in this context. The remaining choices fail because they don’t satisfy the full definition.
Q87. Which statement about dead-letter queue is most accurate?
Select an answer to check.
Answer: Hold malformed/failed records.
In this case, Hold malformed/failed records. is correct. Operability. That is exactly the concept behind which statement about dead-letter queue is most accurate in this context. The remaining choices fail because they don’t satisfy the full definition.
Q88. How is dead-letter queue best characterized?
Select an answer to check.
Answer: Hold malformed/failed records.
The best option here is Hold malformed/failed records.. Operability. That is exactly the concept behind how is dead-letter queue best characterized in this context. The remaining choices fail because they don’t satisfy the full definition.
Q89. Which option best describes rerun-safe writes?
Select an answer to check.
Answer: Same write idempotent under retry.
For this question, Same write idempotent under retry. is correct. Achieved via key + version. That is exactly the concept behind which option best describes rerun-safe writes in this context. The remaining choices fail because they don’t satisfy the full definition.
Q90. What is the primary purpose of rerun-safe writes?
Select an answer to check.
Answer: Same write idempotent under retry.
Same write idempotent under retry. is the correct answer here. Achieved via key + version. That is exactly the concept behind what is the primary purpose of rerun-safe writes in this context. The remaining choices fail because they don’t satisfy the full definition.
Q91. Which statement about rerun-safe writes is most accurate?
Select an answer to check.
Answer: Same write idempotent under retry.
Here, Same write idempotent under retry. is the right choice. Achieved via key + version. It fits the requirement in the prompt about which statement about rerun-safe writes is most accurate. The remaining choices fail because they don’t satisfy the full definition.
Q92. How is rerun-safe writes best characterized?
Select an answer to check.
Answer: Same write idempotent under retry.
In this case, Same write idempotent under retry. is correct. Achieved via key + version. It fits the requirement in the prompt about how is rerun-safe writes best characterized. The remaining choices fail because they don’t satisfy the full definition.
Q93. Which option best describes change log table?
Select an answer to check.
Answer: Auxiliary table tracking source changes.
The best option here is Auxiliary table tracking source changes.. Useful for audit and recovery. It fits the requirement in the prompt about which option best describes change log table. The remaining choices fail because they don’t satisfy the full definition.
Q94. What is the primary purpose of change log table?
Select an answer to check.
Answer: Auxiliary table tracking source changes.
For this question, Auxiliary table tracking source changes. is correct. Useful for audit and recovery. It fits the requirement in the prompt about what is the primary purpose of change log. The remaining choices fail because they don’t satisfy the full definition.
Q95. Which statement about change log table is most accurate?
Select an answer to check.
Answer: Auxiliary table tracking source changes.
Auxiliary table tracking source changes. is the correct answer here. Useful for audit and recovery. It fits the requirement in the prompt about which statement about change log table is most. The remaining choices fail because they don’t satisfy the full definition.
Q96. How is change log table best characterized?
Select an answer to check.
Answer: Auxiliary table tracking source changes.
Here, Auxiliary table tracking source changes. is the right choice. Useful for audit and recovery. This is the most accurate statement for how is change log table best characterized. The remaining choices fail because they don’t satisfy the full definition.
Q97. Which option best describes avoid hot keys?
Select an answer to check.
Answer: Skewed keys overload partitions.
In this case, Skewed keys overload partitions. is correct. Salt or rebalance. This is the most accurate statement for which option best describes avoid hot keys. The remaining choices fail because they don’t satisfy the full definition.
Q98. What is the primary purpose of avoid hot keys?
Select an answer to check.
Answer: Skewed keys overload partitions.
The best option here is Skewed keys overload partitions.. Salt or rebalance. This is the most accurate statement for what is the primary purpose of avoid hot. The remaining choices fail because they don’t satisfy the full definition.
Q99. Which statement about avoid hot keys is most accurate?
Select an answer to check.
Answer: Skewed keys overload partitions.
For this question, Skewed keys overload partitions. is correct. Salt or rebalance. This is the most accurate statement for which statement about avoid hot keys is most. The remaining choices fail because they don’t satisfy the full definition.
Q100. How is avoid hot keys best characterized?
Select an answer to check.
Answer: Skewed keys overload partitions.
Skewed keys overload partitions. is the correct answer here. Salt or rebalance. This is the most accurate statement for how is avoid hot keys best characterized. The remaining choices fail because they don’t satisfy the full definition.