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Explain optimistic vs pessimistic locking.
낙관적 락은 버전 컬럼으로 충돌을 감지해 재시도하고, 비관적 락은 SELECT FOR UPDATE로 미리 행을 잠근다.
Say it in your own words — but hit these: pessimistic · optimistic · select for update · version column · retry · conflict · contention · deadlock · throughput
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