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Technical Interview Practice, AI‑Graded
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Explain the difference between optimistic and pessimistic locking.
“Optimistic locking assumes conflicts are rare—reads proceed without locks, then checks a version column at write time. If it changed, the transaction retries. Pessimistic locking acquires a lock on read (SELECT FOR UPDATE), blocking other transactions until commit. Optimistic scales better under low contention; pessimistic prevents wasted retries under high contention.”
Complete. Covers mechanism, trade-offs, and when to use each.
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AI grades like a senior engineer
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What is the Global Interpreter Lock (GIL) and why does it exist?
“A mutex that prevents multiple threads from executing Python bytecode simultaneously.”
Correct mechanism, but missing: memory safety rationale, impact on CPU-bound vs I/O-bound tasks, and common workarounds.
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220 questions across 13 domains
The concepts that come up in real senior-level interviews.
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