Spark Joins Optimization MCQ Questions with Answers (Latest 2026)

Q1. Which option best describes a broadcast join?

A. Pure sort-merge. B. Pure RDD. C. Small side broadcast to all executors. D. Pure cross.

Select an answer to check.

Answer: Small side broadcast to all executors.

Here, Small side broadcast to all executors. is the right choice. Best for small/large. It aligns directly with what the question asks about which option best describes a broadcast join. A quick elimination of partially true options helps confirm it.

Q2. What is the primary purpose of a broadcast join?

A. Pure sort-merge. B. Pure RDD. C. Small side broadcast to all executors. D. Pure cross.

Select an answer to check.

Answer: Small side broadcast to all executors.

In this case, Small side broadcast to all executors. is correct. Best for small/large. It aligns directly with what the question asks about what is the primary purpose of a broadcast. A quick elimination of partially true options helps confirm it.

Q3. Which statement about a broadcast join is most accurate?

A. Pure sort-merge. B. Small side broadcast to all executors. C. Pure cross. D. Pure RDD.

Select an answer to check.

Answer: Small side broadcast to all executors.

The best option here is Small side broadcast to all executors.. Best for small/large. It aligns directly with what the question asks about which statement about a broadcast join is most. A quick elimination of partially true options helps confirm it.

Q4. How is a broadcast join best characterized?

A. Pure RDD. B. Small side broadcast to all executors. C. Pure cross. D. Pure sort-merge.

Select an answer to check.

Answer: Small side broadcast to all executors.

For this question, Small side broadcast to all executors. is correct. Best for small/large. It aligns directly with what the question asks about how is a broadcast join best characterized. A quick elimination of partially true options helps confirm it.

Q5. Which option best describes a sort-merge join?

A. Pure broadcast. B. Pure cross. C. Sort both sides on key, then merge. D. Pure RDD.

Select an answer to check.

Answer: Sort both sides on key, then merge.

Sort both sides on key, then merge. is the correct answer here. Default for large/large. It aligns directly with what the question asks about which option best describes a sort-merge join. A quick elimination of partially true options helps confirm it.

Q6. What is the primary purpose of a sort-merge join?

A. Pure broadcast. B. Sort both sides on key, then merge. C. Pure RDD. D. Pure cross.

Select an answer to check.

Answer: Sort both sides on key, then merge.

Here, Sort both sides on key, then merge. is the right choice. Default for large/large. This matches the core idea being tested around what is the primary purpose of a sort-merge. A quick elimination of partially true options helps confirm it.

Q7. Which statement about a sort-merge join is most accurate?

A. Pure broadcast. B. Pure cross. C. Pure RDD. D. Sort both sides on key, then merge.

Select an answer to check.

Answer: Sort both sides on key, then merge.

In this case, Sort both sides on key, then merge. is correct. Default for large/large. This matches the core idea being tested around which statement about a sort-merge join is most. A quick elimination of partially true options helps confirm it.

Q8. How is a sort-merge join best characterized?

A. Pure broadcast. B. Sort both sides on key, then merge. C. Pure RDD. D. Pure cross.

Select an answer to check.

Answer: Sort both sides on key, then merge.

The best option here is Sort both sides on key, then merge.. Default for large/large. This matches the core idea being tested around how is a sort-merge join best characterized. A quick elimination of partially true options helps confirm it.

Q9. Which option best describes a shuffle hash join?

A. Pure broadcast. B. Pure sort-merge. C. Pure cross. D. Hash partition; build hash on smaller side.

Select an answer to check.

Answer: Hash partition; build hash on smaller side.

For this question, Hash partition; build hash on smaller side. is correct. Useful for medium-size. This matches the core idea being tested around which option best describes a shuffle hash join. A quick elimination of partially true options helps confirm it.

Q10. What is the primary purpose of a shuffle hash join?

A. Pure cross. B. Pure broadcast. C. Hash partition; build hash on smaller side. D. Pure sort-merge.

Select an answer to check.

Answer: Hash partition; build hash on smaller side.

Hash partition; build hash on smaller side. is the correct answer here. Useful for medium-size. This matches the core idea being tested around what is the primary purpose of a shuffle. A quick elimination of partially true options helps confirm it.

Q11. Which statement about a shuffle hash join is most accurate?

A. Pure broadcast. B. Hash partition; build hash on smaller side. C. Pure cross. D. Pure sort-merge.

Select an answer to check.

Answer: Hash partition; build hash on smaller side.

Here, Hash partition; build hash on smaller side. is the right choice. Useful for medium-size. That is exactly the concept behind which statement about a shuffle hash join is in this context. A quick elimination of partially true options helps confirm it.

Q12. How is a shuffle hash join best characterized?

A. Pure broadcast. B. Pure cross. C. Pure sort-merge. D. Hash partition; build hash on smaller side.

Select an answer to check.

Answer: Hash partition; build hash on smaller side.

In this case, Hash partition; build hash on smaller side. is correct. Useful for medium-size. That is exactly the concept behind how is a shuffle hash join best characterized in this context. A quick elimination of partially true options helps confirm it.

Q13. Which option best describes a bucket join?

A. Pure broadcast. B. Pure sort-merge with shuffle. C. Pre-bucketed tables join without shuffle. D. Pure cross.

Select an answer to check.

Answer: Pre-bucketed tables join without shuffle.

The best option here is Pre-bucketed tables join without shuffle.. Requires bucketed sources. That is exactly the concept behind which option best describes a bucket join in this context. A quick elimination of partially true options helps confirm it.

Q14. What is the primary purpose of a bucket join?

A. Pure sort-merge with shuffle. B. Pre-bucketed tables join without shuffle. C. Pure cross. D. Pure broadcast.

Select an answer to check.

Answer: Pre-bucketed tables join without shuffle.

For this question, Pre-bucketed tables join without shuffle. is correct. Requires bucketed sources. That is exactly the concept behind what is the primary purpose of a bucket in this context. A quick elimination of partially true options helps confirm it.

Q15. Which statement about a bucket join is most accurate?

A. Pure cross. B. Pre-bucketed tables join without shuffle. C. Pure sort-merge with shuffle. D. Pure broadcast.

Select an answer to check.

Answer: Pre-bucketed tables join without shuffle.

Pre-bucketed tables join without shuffle. is the correct answer here. Requires bucketed sources. That is exactly the concept behind which statement about a bucket join is most in this context. A quick elimination of partially true options helps confirm it.

Q16. How is a bucket join best characterized?

A. Pre-bucketed tables join without shuffle. B. Pure cross. C. Pure broadcast. D. Pure sort-merge with shuffle.

Select an answer to check.

Answer: Pre-bucketed tables join without shuffle.

Here, Pre-bucketed tables join without shuffle. is the right choice. Requires bucketed sources. It fits the requirement in the prompt about how is a bucket join best characterized. A quick elimination of partially true options helps confirm it.

Q17. Which option best describes a cross join?

A. Inner join. B. Pure broadcast. C. Pure sort-merge. D. Cartesian product of two DataFrames.

Select an answer to check.

Answer: Cartesian product of two DataFrames.

In this case, Cartesian product of two DataFrames. is correct. Avoid unless intentional. It fits the requirement in the prompt about which option best describes a cross join. A quick elimination of partially true options helps confirm it.

Q18. What is the primary purpose of a cross join?

A. Cartesian product of two DataFrames. B. Pure sort-merge. C. Pure broadcast. D. Inner join.

Select an answer to check.

Answer: Cartesian product of two DataFrames.

The best option here is Cartesian product of two DataFrames.. Avoid unless intentional. It fits the requirement in the prompt about what is the primary purpose of a cross. A quick elimination of partially true options helps confirm it.

Q19. Which statement about a cross join is most accurate?

A. Cartesian product of two DataFrames. B. Pure broadcast. C. Inner join. D. Pure sort-merge.

Select an answer to check.

Answer: Cartesian product of two DataFrames.

For this question, Cartesian product of two DataFrames. is correct. Avoid unless intentional. It fits the requirement in the prompt about which statement about a cross join is most. A quick elimination of partially true options helps confirm it.

Q20. How is a cross join best characterized?

A. Pure broadcast. B. Cartesian product of two DataFrames. C. Inner join. D. Pure sort-merge.

Select an answer to check.

Answer: Cartesian product of two DataFrames.

Cartesian product of two DataFrames. is the correct answer here. Avoid unless intentional. It fits the requirement in the prompt about how is a cross join best characterized. A quick elimination of partially true options helps confirm it.

Q21. Which option best describes broadcast hint?

A. Force broadcast strategy. B. Pure comment. C. Pure log. D. Pure cache.

Select an answer to check.

Answer: Force broadcast strategy.

Here, Force broadcast strategy. is the right choice. /*+ BROADCAST(t) */ in SQL. This is the most accurate statement for which option best describes broadcast hint. A quick elimination of partially true options helps confirm it.

Q22. What is the primary purpose of broadcast hint?

A. Pure log. B. Pure comment. C. Force broadcast strategy. D. Pure cache.

Select an answer to check.

Answer: Force broadcast strategy.

In this case, Force broadcast strategy. is correct. /*+ BROADCAST(t) */ in SQL. This is the most accurate statement for what is the primary purpose of broadcast hint. A quick elimination of partially true options helps confirm it.

Q23. Which statement about broadcast hint is most accurate?

A. Pure cache. B. Force broadcast strategy. C. Pure log. D. Pure comment.

Select an answer to check.

Answer: Force broadcast strategy.

The best option here is Force broadcast strategy.. /*+ BROADCAST(t) */ in SQL. This is the most accurate statement for which statement about broadcast hint is most accurate. A quick elimination of partially true options helps confirm it.

Q24. How is broadcast hint best characterized?

A. Pure cache. B. Pure log. C. Pure comment. D. Force broadcast strategy.

Select an answer to check.

Answer: Force broadcast strategy.

For this question, Force broadcast strategy. is correct. /*+ BROADCAST(t) */ in SQL. This is the most accurate statement for how is broadcast hint best characterized. A quick elimination of partially true options helps confirm it.

Q25. Which option best describes shuffle hash hint?

A. Request shuffle hash join. B. Pure log. C. Pure comment. D. Pure cache.

Select an answer to check.

Answer: Request shuffle hash join.

Request shuffle hash join. is the correct answer here. /*+ SHUFFLE_HASH(t) */. This is the most accurate statement for which option best describes shuffle hash hint. A quick elimination of partially true options helps confirm it.

Q26. What is the primary purpose of shuffle hash hint?

A. Pure log. B. Pure cache. C. Request shuffle hash join. D. Pure comment.

Select an answer to check.

Answer: Request shuffle hash join.

Here, Request shuffle hash join. is the right choice. /*+ SHUFFLE_HASH(t) */. It aligns directly with what the question asks about what is the primary purpose of shuffle hash. The other options are either incomplete or contextually incorrect.

Q27. Which statement about shuffle hash hint is most accurate?

A. Pure cache. B. Request shuffle hash join. C. Pure log. D. Pure comment.

Select an answer to check.

Answer: Request shuffle hash join.

In this case, Request shuffle hash join. is correct. /*+ SHUFFLE_HASH(t) */. It aligns directly with what the question asks about which statement about shuffle hash hint is most. The other options are either incomplete or contextually incorrect.

Q28. How is shuffle hash hint best characterized?

A. Request shuffle hash join. B. Pure comment. C. Pure log. D. Pure cache.

Select an answer to check.

Answer: Request shuffle hash join.

The best option here is Request shuffle hash join.. /*+ SHUFFLE_HASH(t) */. It aligns directly with what the question asks about how is shuffle hash hint best characterized. The other options are either incomplete or contextually incorrect.

Q29. Which option best describes merge hint?

A. Pure cache. B. Pure log. C. Pure comment. D. Request sort-merge join.

Select an answer to check.

Answer: Request sort-merge join.

For this question, Request sort-merge join. is correct. /*+ MERGE(t) */. It aligns directly with what the question asks about which option best describes merge hint. The other options are either incomplete or contextually incorrect.

Q30. What is the primary purpose of merge hint?

A. Pure log. B. Pure cache. C. Request sort-merge join. D. Pure comment.

Select an answer to check.

Answer: Request sort-merge join.

Request sort-merge join. is the correct answer here. /*+ MERGE(t) */. It aligns directly with what the question asks about what is the primary purpose of merge hint. The other options are either incomplete or contextually incorrect.

Q31. Which statement about merge hint is most accurate?

A. Pure cache. B. Request sort-merge join. C. Pure log. D. Pure comment.

Select an answer to check.

Answer: Request sort-merge join.

Here, Request sort-merge join. is the right choice. /*+ MERGE(t) */. This matches the core idea being tested around which statement about merge hint is most accurate. The other options are either incomplete or contextually incorrect.

Q32. How is merge hint best characterized?

A. Pure cache. B. Pure log. C. Request sort-merge join. D. Pure comment.

Select an answer to check.

Answer: Request sort-merge join.

In this case, Request sort-merge join. is correct. /*+ MERGE(t) */. This matches the core idea being tested around how is merge hint best characterized. The other options are either incomplete or contextually incorrect.

Q33. Which option best describes autoBroadcastJoinThreshold?

A. Always broadcast. B. Never broadcast. C. Pure log. D. Size threshold for automatic broadcast.

Select an answer to check.

Answer: Size threshold for automatic broadcast.

The best option here is Size threshold for automatic broadcast.. Tunable; can disable with -1. This matches the core idea being tested around which option best describes autobroadcastjointhreshold. The other options are either incomplete or contextually incorrect.

Q34. What is the primary purpose of autoBroadcastJoinThreshold?

A. Always broadcast. B. Never broadcast. C. Pure log. D. Size threshold for automatic broadcast.

Select an answer to check.

Answer: Size threshold for automatic broadcast.

For this question, Size threshold for automatic broadcast. is correct. Tunable; can disable with -1. This matches the core idea being tested around what is the primary purpose of autobroadcastjointhreshold. The other options are either incomplete or contextually incorrect.

Q35. Which statement about autoBroadcastJoinThreshold is most accurate?

A. Always broadcast. B. Never broadcast. C. Size threshold for automatic broadcast. D. Pure log.

Select an answer to check.

Answer: Size threshold for automatic broadcast.

Size threshold for automatic broadcast. is the correct answer here. Tunable; can disable with -1. This matches the core idea being tested around which statement about autobroadcastjointhreshold is most accurate. The other options are either incomplete or contextually incorrect.

Q36. How is autoBroadcastJoinThreshold best characterized?

A. Always broadcast. B. Size threshold for automatic broadcast. C. Pure log. D. Never broadcast.

Select an answer to check.

Answer: Size threshold for automatic broadcast.

Here, Size threshold for automatic broadcast. is the right choice. Tunable; can disable with -1. That is exactly the concept behind how is autobroadcastjointhreshold best characterized in this context. The other options are either incomplete or contextually incorrect.

Q37. Which option best describes skew in joins?

A. Pure broadcast issue. B. Even distribution always. C. Few keys carry most data. D. Pure cache issue.

Select an answer to check.

Answer: Few keys carry most data.

In this case, Few keys carry most data. is correct. Causes stragglers. That is exactly the concept behind which option best describes skew in joins in this context. The other options are either incomplete or contextually incorrect.

Q38. What is the primary purpose of skew in joins?

A. Pure cache issue. B. Even distribution always. C. Few keys carry most data. D. Pure broadcast issue.

Select an answer to check.

Answer: Few keys carry most data.

The best option here is Few keys carry most data.. Causes stragglers. That is exactly the concept behind what is the primary purpose of skew in in this context. The other options are either incomplete or contextually incorrect.

Q39. Which statement about skew in joins is most accurate?

A. Pure broadcast issue. B. Pure cache issue. C. Few keys carry most data. D. Even distribution always.

Select an answer to check.

Answer: Few keys carry most data.

For this question, Few keys carry most data. is correct. Causes stragglers. That is exactly the concept behind which statement about skew in joins is most in this context. The other options are either incomplete or contextually incorrect.

Q40. How is skew in joins best characterized?

A. Pure broadcast issue. B. Even distribution always. C. Pure cache issue. D. Few keys carry most data.

Select an answer to check.

Answer: Few keys carry most data.

Few keys carry most data. is the correct answer here. Causes stragglers. That is exactly the concept behind how is skew in joins best characterized in this context. The other options are either incomplete or contextually incorrect.

Q41. Which option best describes AQE skew handling?

A. Pure broadcast. B. Pure log. C. Split skewed partitions into smaller tasks. D. Pure cache.

Select an answer to check.

Answer: Split skewed partitions into smaller tasks.

Here, Split skewed partitions into smaller tasks. is the right choice. Configurable thresholds. It fits the requirement in the prompt about which option best describes aqe skew handling. The other options are either incomplete or contextually incorrect.

Q42. What is the primary purpose of AQE skew handling?

A. Pure broadcast. B. Pure log. C. Split skewed partitions into smaller tasks. D. Pure cache.

Select an answer to check.

Answer: Split skewed partitions into smaller tasks.

In this case, Split skewed partitions into smaller tasks. is correct. Configurable thresholds. It fits the requirement in the prompt about what is the primary purpose of aqe skew. The other options are either incomplete or contextually incorrect.

Q43. Which statement about AQE skew handling is most accurate?

A. Split skewed partitions into smaller tasks. B. Pure log. C. Pure cache. D. Pure broadcast.

Select an answer to check.

Answer: Split skewed partitions into smaller tasks.

The best option here is Split skewed partitions into smaller tasks.. Configurable thresholds. It fits the requirement in the prompt about which statement about aqe skew handling is most. The other options are either incomplete or contextually incorrect.

Q44. How is AQE skew handling best characterized?

A. Pure broadcast. B. Split skewed partitions into smaller tasks. C. Pure cache. D. Pure log.

Select an answer to check.

Answer: Split skewed partitions into smaller tasks.

For this question, Split skewed partitions into smaller tasks. is correct. Configurable thresholds. It fits the requirement in the prompt about how is aqe skew handling best characterized. The other options are either incomplete or contextually incorrect.

Q45. Which option best describes salting skewed keys?

A. Add random suffix and join with replicas. B. Pure broadcast only. C. Pure log. D. Pure cache.

Select an answer to check.

Answer: Add random suffix and join with replicas.

Add random suffix and join with replicas. is the correct answer here. Manual technique pre-AQE. It fits the requirement in the prompt about which option best describes salting skewed keys. The other options are either incomplete or contextually incorrect.

Q46. What is the primary purpose of salting skewed keys?

A. Pure broadcast only. B. Pure log. C. Pure cache. D. Add random suffix and join with replicas.

Select an answer to check.

Answer: Add random suffix and join with replicas.

Here, Add random suffix and join with replicas. is the right choice. Manual technique pre-AQE. This is the most accurate statement for what is the primary purpose of salting skewed. The other options are either incomplete or contextually incorrect.

Q47. Which statement about salting skewed keys is most accurate?

A. Pure log. B. Add random suffix and join with replicas. C. Pure cache. D. Pure broadcast only.

Select an answer to check.

Answer: Add random suffix and join with replicas.

In this case, Add random suffix and join with replicas. is correct. Manual technique pre-AQE. This is the most accurate statement for which statement about salting skewed keys is most. The other options are either incomplete or contextually incorrect.

Q48. How is salting skewed keys best characterized?

A. Add random suffix and join with replicas. B. Pure log. C. Pure broadcast only. D. Pure cache.

Select an answer to check.

Answer: Add random suffix and join with replicas.

The best option here is Add random suffix and join with replicas.. Manual technique pre-AQE. This is the most accurate statement for how is salting skewed keys best characterized. The other options are either incomplete or contextually incorrect.

Q49. Which option best describes range joins?

A. Joins on ranges (between). B. Pure broadcast only. C. Equi-joins only. D. Pure cross only.

Select an answer to check.

Answer: Joins on ranges (between).

For this question, Joins on ranges (between). is correct. Often slow without optimization. This is the most accurate statement for which option best describes range joins. The other options are either incomplete or contextually incorrect.

Q50. What is the primary purpose of range joins?

A. Pure broadcast only. B. Pure cross only. C. Joins on ranges (between). D. Equi-joins only.

Select an answer to check.

Answer: Joins on ranges (between).

Joins on ranges (between). is the correct answer here. Often slow without optimization. This is the most accurate statement for what is the primary purpose of range joins. The other options are either incomplete or contextually incorrect.