The aim of the distributed concurrency control is to keep the consistency of the distributed transaction and DDB(Distributed Database),to realize the serializability of the distributed transaction and to make transaction have satisfactory concurrency.

• 分布式并发控制的目的是保证分布事务和分布式数据库的一致性，实现分布事务的可串行性，使事务具有良好的并发度以保证系统具有用户满意的效率。