Data ETL Idempotency MCQ Questions with Answers – Page 2 (Latest 2026)
Practice Data ETL Idempotency 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 is most accurate?
Select an answer to check.
Answer: Persist progress to skip redo work.
Here, Persist progress to skip redo work. is the right choice. Speeds retries. It aligns directly with what the question asks about which statement about checkpointing is most accurate. Competing choices sound plausible, but they miss the key condition.
Q52. How is checkpointing best characterized?
Select an answer to check.
Answer: Persist progress to skip redo work.
In this case, Persist progress to skip redo work. is correct. Speeds retries. It aligns directly with what the question asks about how is checkpointing best characterized. Competing choices sound plausible, but they miss the key condition.
Q53. Which option best describes idempotent file naming?
Select an answer to check.
Answer: Use deterministic file paths.
The best option here is Use deterministic file paths.. Reruns overwrite same files. It aligns directly with what the question asks about which option best describes idempotent file naming. Competing choices sound plausible, but they miss the key condition.
Q54. What is the primary purpose of idempotent file naming?
Select an answer to check.
Answer: Use deterministic file paths.
For this question, Use deterministic file paths. is correct. Reruns overwrite same files. It aligns directly with what the question asks about what is the primary purpose of idempotent file. Competing choices sound plausible, but they miss the key condition.
Q55. Which statement about idempotent file naming is most accurate?
Select an answer to check.
Answer: Use deterministic file paths.
Use deterministic file paths. is the correct answer here. Reruns overwrite same files. It aligns directly with what the question asks about which statement about idempotent file naming is most. Competing choices sound plausible, but they miss the key condition.
Q56. How is idempotent file naming best characterized?
Select an answer to check.
Answer: Use deterministic file paths.
Here, Use deterministic file paths. is the right choice. Reruns overwrite same files. This matches the core idea being tested around how is idempotent file naming best characterized. Competing choices sound plausible, but they miss the key condition.
Q57. Which option best describes idempotent partition writes?
Select an answer to check.
Answer: Overwrite specific partitions safely.
In this case, Overwrite specific partitions safely. is correct. Common in lake/warehouse. This matches the core idea being tested around which option best describes idempotent partition writes. Competing choices sound plausible, but they miss the key condition.
Q58. What is the primary purpose of idempotent partition writes?
Select an answer to check.
Answer: Overwrite specific partitions safely.
The best option here is Overwrite specific partitions safely.. Common in lake/warehouse. This matches the core idea being tested around what is the primary purpose of idempotent partition. Competing choices sound plausible, but they miss the key condition.
Q59. Which statement about idempotent partition writes is most accurate?
Select an answer to check.
Answer: Overwrite specific partitions safely.
For this question, Overwrite specific partitions safely. is correct. Common in lake/warehouse. This matches the core idea being tested around which statement about idempotent partition writes is most. Competing choices sound plausible, but they miss the key condition.
Q60. How is idempotent partition writes best characterized?
Select an answer to check.
Answer: Overwrite specific partitions safely.
Overwrite specific partitions safely. is the correct answer here. Common in lake/warehouse. This matches the core idea being tested around how is idempotent partition writes best characterized. Competing choices sound plausible, but they miss the key condition.
Q61. Which option best describes Delta MERGE INTO?
Select an answer to check.
Answer: Idempotent upserts on Delta tables.
Here, Idempotent upserts on Delta tables. is the right choice. Atomic merges. That is exactly the concept behind which option best describes delta merge into in this context. Competing choices sound plausible, but they miss the key condition.
Q62. What is the primary purpose of Delta MERGE INTO?
Select an answer to check.
Answer: Idempotent upserts on Delta tables.
In this case, Idempotent upserts on Delta tables. is correct. Atomic merges. That is exactly the concept behind what is the primary purpose of delta merge in this context. Competing choices sound plausible, but they miss the key condition.
Q63. Which statement about Delta MERGE INTO is most accurate?
Select an answer to check.
Answer: Idempotent upserts on Delta tables.
The best option here is Idempotent upserts on Delta tables.. Atomic merges. That is exactly the concept behind which statement about delta merge into is most in this context. Competing choices sound plausible, but they miss the key condition.
Q64. How is Delta MERGE INTO best characterized?
Select an answer to check.
Answer: Idempotent upserts on Delta tables.
For this question, Idempotent upserts on Delta tables. is correct. Atomic merges. That is exactly the concept behind how is delta merge into best characterized in this context. Competing choices sound plausible, but they miss the key condition.
Q65. Which option best describes idempotent Airflow tasks?
Select an answer to check.
Answer: Tasks safe under retries.
Tasks safe under retries. is the correct answer here. Use markers and merges. That is exactly the concept behind which option best describes idempotent airflow tasks in this context. Competing choices sound plausible, but they miss the key condition.
Q66. What is the primary purpose of idempotent Airflow tasks?
Select an answer to check.
Answer: Tasks safe under retries.
Here, Tasks safe under retries. is the right choice. Use markers and merges. It fits the requirement in the prompt about what is the primary purpose of idempotent airflow. Competing choices sound plausible, but they miss the key condition.
Q67. Which statement about idempotent Airflow tasks is most accurate?
Select an answer to check.
Answer: Tasks safe under retries.
In this case, Tasks safe under retries. is correct. Use markers and merges. It fits the requirement in the prompt about which statement about idempotent airflow tasks is most. Competing choices sound plausible, but they miss the key condition.
Q68. How is idempotent Airflow tasks best characterized?
Select an answer to check.
Answer: Tasks safe under retries.
The best option here is Tasks safe under retries.. Use markers and merges. It fits the requirement in the prompt about how is idempotent airflow tasks best characterized. Competing choices sound plausible, but they miss the key condition.
Q69. Which option best describes rerun-safe SQL?
Select an answer to check.
Answer: DELETE+INSERT bounded by partition + condition.
For this question, DELETE+INSERT bounded by partition + condition. is correct. Within a transaction if possible. It fits the requirement in the prompt about which option best describes rerun-safe sql. Competing choices sound plausible, but they miss the key condition.
Q70. What is the primary purpose of rerun-safe SQL?
Select an answer to check.
Answer: DELETE+INSERT bounded by partition + condition.
DELETE+INSERT bounded by partition + condition. is the correct answer here. Within a transaction if possible. It fits the requirement in the prompt about what is the primary purpose of rerun-safe sql. Competing choices sound plausible, but they miss the key condition.
Q71. Which statement about rerun-safe SQL is most accurate?
Select an answer to check.
Answer: DELETE+INSERT bounded by partition + condition.
Here, DELETE+INSERT bounded by partition + condition. is the right choice. Within a transaction if possible. This is the most accurate statement for which statement about rerun-safe sql is most accurate. Competing choices sound plausible, but they miss the key condition.
Q72. How is rerun-safe SQL best characterized?
Select an answer to check.
Answer: DELETE+INSERT bounded by partition + condition.
In this case, DELETE+INSERT bounded by partition + condition. is correct. Within a transaction if possible. This is the most accurate statement for how is rerun-safe sql best characterized. Competing choices sound plausible, but they miss the key condition.
Q73. Which option best describes schema-stable keys?
Select an answer to check.
Answer: Keys not affected by schema evolution.
The best option here is Keys not affected by schema evolution.. Stable identifiers. This is the most accurate statement for which option best describes schema-stable keys. Competing choices sound plausible, but they miss the key condition.
Q74. What is the primary purpose of schema-stable keys?
Select an answer to check.
Answer: Keys not affected by schema evolution.
For this question, Keys not affected by schema evolution. is correct. Stable identifiers. This is the most accurate statement for what is the primary purpose of schema-stable keys. Competing choices sound plausible, but they miss the key condition.
Q75. Which statement about schema-stable keys is most accurate?
Select an answer to check.
Answer: Keys not affected by schema evolution.
Keys not affected by schema evolution. is the correct answer here. Stable identifiers. This is the most accurate statement for which statement about schema-stable keys is most accurate. Competing choices sound plausible, but they miss the key condition.
Q76. How is schema-stable keys best characterized?
Select an answer to check.
Answer: Keys not affected by schema evolution.
Here, Keys not affected by schema evolution. is the right choice. Stable identifiers. It aligns directly with what the question asks about how is schema-stable keys best characterized. The remaining choices fail because they don’t satisfy the full definition.
Q77. Which option best describes event time keys?
Select an answer to check.
Answer: Compose keys with event time for uniqueness.
In this case, Compose keys with event time for uniqueness. is correct. Useful in streams. It aligns directly with what the question asks about which option best describes event time keys. The remaining choices fail because they don’t satisfy the full definition.
Q78. What is the primary purpose of event time keys?
Select an answer to check.
Answer: Compose keys with event time for uniqueness.
The best option here is Compose keys with event time for uniqueness.. Useful in streams. It aligns directly with what the question asks about what is the primary purpose of event time. The remaining choices fail because they don’t satisfy the full definition.
Q79. Which statement about event time keys is most accurate?
Select an answer to check.
Answer: Compose keys with event time for uniqueness.
For this question, Compose keys with event time for uniqueness. is correct. Useful in streams. It aligns directly with what the question asks about which statement about event time keys is most. The remaining choices fail because they don’t satisfy the full definition.
Q80. How is event time keys best characterized?
Select an answer to check.
Answer: Compose keys with event time for uniqueness.
Compose keys with event time for uniqueness. is the correct answer here. Useful in streams. It aligns directly with what the question asks about how is event time keys best characterized. The remaining choices fail because they don’t satisfy the full definition.
Q81. Which option best describes idempotent migrations?
Select an answer to check.
Answer: Schema migrations safe to re-run.
Here, Schema migrations safe to re-run. is the right choice. Use IF NOT EXISTS. This matches the core idea being tested around which option best describes idempotent migrations. The remaining choices fail because they don’t satisfy the full definition.
Q82. What is the primary purpose of idempotent migrations?
Select an answer to check.
Answer: Schema migrations safe to re-run.
In this case, Schema migrations safe to re-run. is correct. Use IF NOT EXISTS. This matches the core idea being tested around what is the primary purpose of idempotent migrations. The remaining choices fail because they don’t satisfy the full definition.
Q83. Which statement about idempotent migrations is most accurate?
Select an answer to check.
Answer: Schema migrations safe to re-run.
The best option here is Schema migrations safe to re-run.. Use IF NOT EXISTS. This matches the core idea being tested around which statement about idempotent migrations is most accurate. The remaining choices fail because they don’t satisfy the full definition.
Q84. How is idempotent migrations best characterized?
Select an answer to check.
Answer: Schema migrations safe to re-run.
For this question, Schema migrations safe to re-run. is correct. Use IF NOT EXISTS. This matches the core idea being tested around how is idempotent migrations best characterized. The remaining choices fail because they don’t satisfy the full definition.
Q85. Which option best describes idempotent API calls?
Select an answer to check.
Answer: Repeats produce same result.
Repeats produce same result. is the correct answer here. Use idempotency keys. This matches the core idea being tested around which option best describes idempotent api calls. The remaining choices fail because they don’t satisfy the full definition.
Q86. What is the primary purpose of idempotent API calls?
Select an answer to check.
Answer: Repeats produce same result.
Here, Repeats produce same result. is the right choice. Use idempotency keys. That is exactly the concept behind what is the primary purpose of idempotent api in this context. The remaining choices fail because they don’t satisfy the full definition.
Q87. Which statement about idempotent API calls is most accurate?
Select an answer to check.
Answer: Repeats produce same result.
In this case, Repeats produce same result. is correct. Use idempotency keys. That is exactly the concept behind which statement about idempotent api calls is most in this context. The remaining choices fail because they don’t satisfy the full definition.
Q88. How is idempotent API calls best characterized?
Select an answer to check.
Answer: Repeats produce same result.
The best option here is Repeats produce same result.. Use idempotency keys. That is exactly the concept behind how is idempotent api calls best characterized in this context. The remaining choices fail because they don’t satisfy the full definition.
Q89. Which option best describes retry storms?
Select an answer to check.
Answer: Many simultaneous retries overwhelm dependencies.
For this question, Many simultaneous retries overwhelm dependencies. is correct. Mitigate with jitter and limits. That is exactly the concept behind which option best describes retry storms in this context. The remaining choices fail because they don’t satisfy the full definition.
Q90. What is the primary purpose of retry storms?
Select an answer to check.
Answer: Many simultaneous retries overwhelm dependencies.
Many simultaneous retries overwhelm dependencies. is the correct answer here. Mitigate with jitter and limits. That is exactly the concept behind what is the primary purpose of retry storms in this context. The remaining choices fail because they don’t satisfy the full definition.
Q91. Which statement about retry storms is most accurate?
Select an answer to check.
Answer: Many simultaneous retries overwhelm dependencies.
Here, Many simultaneous retries overwhelm dependencies. is the right choice. Mitigate with jitter and limits. It fits the requirement in the prompt about which statement about retry storms is most accurate. The remaining choices fail because they don’t satisfy the full definition.
Q92. How is retry storms best characterized?
Select an answer to check.
Answer: Many simultaneous retries overwhelm dependencies.
In this case, Many simultaneous retries overwhelm dependencies. is correct. Mitigate with jitter and limits. It fits the requirement in the prompt about how is retry storms best characterized. The remaining choices fail because they don’t satisfy the full definition.
Q93. Which option best describes idempotency in stream operators?
Select an answer to check.
Answer: Operators tolerate replays.
The best option here is Operators tolerate replays.. Designed via state + checkpoints. It fits the requirement in the prompt about which option best describes idempotency in stream operators. The remaining choices fail because they don’t satisfy the full definition.
Q94. What is the primary purpose of idempotency in stream operators?
Select an answer to check.
Answer: Operators tolerate replays.
For this question, Operators tolerate replays. is correct. Designed via state + checkpoints. It fits the requirement in the prompt about what is the primary purpose of idempotency in. The remaining choices fail because they don’t satisfy the full definition.
Q95. Which statement about idempotency in stream operators is most accurate?
Select an answer to check.
Answer: Operators tolerate replays.
Operators tolerate replays. is the correct answer here. Designed via state + checkpoints. It fits the requirement in the prompt about which statement about idempotency in stream operators is. The remaining choices fail because they don’t satisfy the full definition.
Q96. How is idempotency in stream operators best characterized?
Select an answer to check.
Answer: Operators tolerate replays.
Here, Operators tolerate replays. is the right choice. Designed via state + checkpoints. This is the most accurate statement for how is idempotency in stream operators best characterized. The remaining choices fail because they don’t satisfy the full definition.
Q97. Which option best describes audit columns?
Select an answer to check.
Answer: run_id, ingested_at to track provenance.
In this case, run_id, ingested_at to track provenance. is correct. Aid debugging and rerun-safety. This is the most accurate statement for which option best describes audit columns. The remaining choices fail because they don’t satisfy the full definition.
Q98. What is the primary purpose of audit columns?
Select an answer to check.
Answer: run_id, ingested_at to track provenance.
The best option here is run_id, ingested_at to track provenance.. Aid debugging and rerun-safety. This is the most accurate statement for what is the primary purpose of audit columns. The remaining choices fail because they don’t satisfy the full definition.
Q99. Which statement about audit columns is most accurate?
Select an answer to check.
Answer: run_id, ingested_at to track provenance.
For this question, run_id, ingested_at to track provenance. is correct. Aid debugging and rerun-safety. This is the most accurate statement for which statement about audit columns is most accurate. The remaining choices fail because they don’t satisfy the full definition.
Q100. How is audit columns best characterized?
Select an answer to check.
Answer: run_id, ingested_at to track provenance.
run_id, ingested_at to track provenance. is the correct answer here. Aid debugging and rerun-safety. This is the most accurate statement for how is audit columns best characterized. The remaining choices fail because they don’t satisfy the full definition.