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Concurrency interview questions

12 real Concurrency questions from the EF Core bank, as asked in Indian campus drives and tech interviews. Every question has a verified answer and an AI-tutor explanation on placd — free to start.

1. What is optimistic concurrency?

Mid
  1. A.the strategy that allows simultaneous edits and detects conflicts only at save time rather than locking rows up front
  2. B.a property checked in the update predicate so a save fails if another writer changed the row since it was read
  3. C.the error thrown when a save affects fewer rows than expected because a tracked row was changed or removed by someone else
  4. D.a database-managed binary value that changes on every update, commonly used as an automatic conflict-detection token
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2. Which term means: "the strategy that allows simultaneous edits and detects conflicts only at save time rather than locking rows up front"?

Mid
  1. A.rowversion
  2. B.concurrency token
  3. C.DbUpdateConcurrencyException
  4. D.optimistic concurrency
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3. Which statement is correct?

Mid
  1. A.optimistic concurrency — the error thrown when a save affects fewer rows than expected because a tracked row was changed or removed by someone else
  2. B.optimistic concurrency — a database-managed binary value that changes on every update, commonly used as an automatic conflict-detection token
  3. C.optimistic concurrency — a property checked in the update predicate so a save fails if another writer changed the row since it was read
  4. D.optimistic concurrency — the strategy that allows simultaneous edits and detects conflicts only at save time rather than locking rows up front
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4. What is concurrency token?

Mid
  1. A.the error thrown when a save affects fewer rows than expected because a tracked row was changed or removed by someone else
  2. B.a database-managed binary value that changes on every update, commonly used as an automatic conflict-detection token
  3. C.a property checked in the update predicate so a save fails if another writer changed the row since it was read
  4. D.the strategy that allows simultaneous edits and detects conflicts only at save time rather than locking rows up front
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5. Which term means: "a property checked in the update predicate so a save fails if another writer changed the row since it was read"?

Mid
  1. A.concurrency token
  2. B.optimistic concurrency
  3. C.rowversion
  4. D.DbUpdateConcurrencyException
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6. Which statement is correct?

Mid
  1. A.concurrency token — a database-managed binary value that changes on every update, commonly used as an automatic conflict-detection token
  2. B.concurrency token — a property checked in the update predicate so a save fails if another writer changed the row since it was read
  3. C.concurrency token — the error thrown when a save affects fewer rows than expected because a tracked row was changed or removed by someone else
  4. D.concurrency token — the strategy that allows simultaneous edits and detects conflicts only at save time rather than locking rows up front
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7. What is rowversion?

Mid
  1. A.a property checked in the update predicate so a save fails if another writer changed the row since it was read
  2. B.a database-managed binary value that changes on every update, commonly used as an automatic conflict-detection token
  3. C.the error thrown when a save affects fewer rows than expected because a tracked row was changed or removed by someone else
  4. D.the strategy that allows simultaneous edits and detects conflicts only at save time rather than locking rows up front
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8. Which term means: "a database-managed binary value that changes on every update, commonly used as an automatic conflict-detection token"?

Mid
  1. A.DbUpdateConcurrencyException
  2. B.concurrency token
  3. C.optimistic concurrency
  4. D.rowversion
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9. Which statement is correct?

Mid
  1. A.rowversion — the strategy that allows simultaneous edits and detects conflicts only at save time rather than locking rows up front
  2. B.rowversion — the error thrown when a save affects fewer rows than expected because a tracked row was changed or removed by someone else
  3. C.rowversion — a property checked in the update predicate so a save fails if another writer changed the row since it was read
  4. D.rowversion — a database-managed binary value that changes on every update, commonly used as an automatic conflict-detection token
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10. What is DbUpdateConcurrencyException?

Senior
  1. A.a database-managed binary value that changes on every update, commonly used as an automatic conflict-detection token
  2. B.a property checked in the update predicate so a save fails if another writer changed the row since it was read
  3. C.the strategy that allows simultaneous edits and detects conflicts only at save time rather than locking rows up front
  4. D.the error thrown when a save affects fewer rows than expected because a tracked row was changed or removed by someone else
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11. Which term means: "the error thrown when a save affects fewer rows than expected because a tracked row was changed or removed by someone else"?

Senior
  1. A.concurrency token
  2. B.optimistic concurrency
  3. C.DbUpdateConcurrencyException
  4. D.rowversion
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12. Which statement is correct?

Senior
  1. A.DbUpdateConcurrencyException — a property checked in the update predicate so a save fails if another writer changed the row since it was read
  2. B.DbUpdateConcurrencyException — a database-managed binary value that changes on every update, commonly used as an automatic conflict-detection token
  3. C.DbUpdateConcurrencyException — the strategy that allows simultaneous edits and detects conflicts only at save time rather than locking rows up front
  4. D.DbUpdateConcurrencyException — the error thrown when a save affects fewer rows than expected because a tracked row was changed or removed by someone else
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