Device for controlling multiple transactions contending concurrently for the same resource in a distributed database system

摘要

A database processor in a distributed database system has a decision making section for use in detecting whether a distributed deadlock has occurred if a contention is detected by a contention detector. If a distributed deadlock occurs, the decision making section posts or provides a concurrency controller with information regarding the detection of the distributed deadlock, whose occurrence has been detected by a global deadlock detector on a network to which the database processor is connected. The concurrency controller instructs a transaction controller to cancel the queuing of the transaction forming the distributed deadlock. The transaction controller can then take prescribed controlling actions to swiftly resolve the distributed deadlock.