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Which of the following statements about handling concurrency in the Library Management System's LoanManager is INCORRECT?

medium🐞 Bug Identification Q14 of Q15
OOP & Design Patterns - Design a Library Management System - LLD with Relationships & Edge Cases
Which of the following statements about handling concurrency in the Library Management System's LoanManager is INCORRECT?
AOptimistic locking is unsuitable because it always leads to deadlocks in high contention scenarios.
BUsing pessimistic locking on book records ensures no two users can borrow the same book simultaneously.
CImplementing atomic check-and-update operations prevents race conditions during loan processing.
DUsing version numbers or timestamps can help detect conflicting updates in optimistic concurrency control.
Step-by-Step Solution

  1. Step 1: Understand pessimistic locking

    Pessimistic locking prevents concurrent conflicting access, so Using pessimistic locking on book records ensures no two users can borrow the same book simultaneously. is correct.

  2. Step 2: Why optimistic locking is not always deadlock?

    Optimistic locking is unsuitable because it always leads to deadlocks in high contention scenarios. is incorrect; optimistic locking reduces deadlocks by retrying on conflicts.

  3. Step 3: Atomic operations prevent race conditions

    Implementing atomic check-and-update operations prevents race conditions during loan processing. is correct and essential for concurrency safety.

  4. Step 4: Versioning aids optimistic concurrency

    Using version numbers or timestamps can help detect conflicting updates in optimistic concurrency control. correctly describes conflict detection mechanisms.

  5. Final Answer:

    Option A -> Option A

  6. Quick Check:

    Optimistic locking reduces deadlocks; it does not always cause them.
Quick Trick: Optimistic locking avoids deadlocks by retrying, pessimistic locking blocks access [OK]
Common Mistakes:
MISTAKES
  • Believing optimistic locking always causes deadlocks
  • Confusing locking types and their effects
  • Ignoring atomicity in concurrency control
Trap Explanation:
PITFALL
  • Option A is a common misconception; optimistic locking is designed to minimize deadlocks, not cause them.
Interviewer Note:
CONTEXT
  • Tests understanding of concurrency control mechanisms and common misconceptions.
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