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When executing DML statements locks are typically acquired in unpredictable order, what may cause deadlocks. Typically RDBMS vendors implement deadlock detectors which rollback last statement in case deadlock is found. Deadlock detection is expensive in distributed environment as it requires coordination between nodes over networks. In the first iteration we can define per-statement lock timeout. If locks cannot be obtained in the given timeout, statement is rolled-back and appropriate exception is thrown.

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