Optimistic concurrency contro by R4R Team

The only approach that is consistent with high concurrency and high scalability is optimistic concurrency control with versioning. Version checking uses version numbers, or timestamps, to detect conflicting updates (and to prevent lost updates). Hibernate provides for three possible approaches to writing application code that uses optimistic concurrency. The use cases we show are in the context of long application transactions but version checking also has the benefit of preventing lost updates in single database transactions.
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