Web Reference: The main difference is that optimistic locking incurs overhead only if there's a conflict, whereas pessimistic locking has reduced overhead on conflict. So optimistic is best in case where most transactions don't conflict - which I hope is usually the case for most apps. Mar 1, 2026 · Under sustained conflict, optimistic locking can actually perform worse than pessimistic locking because of all the wasted read-write cycles. The other risk is not handling the conflict at all. Feb 26, 2026 · PostgreSQL provides various lock modes to control concurrent access to data in tables. These modes can be used for application-controlled locking in situations where MVCC does not give the desired behavior.
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