Distributed and parallel database system ( dpdbs ) is the joint of distributed computing , parallel process , and network technology . it is not only powerful at distributed data management , but also has well performance in parallel processing 分布式并行数据库系统( distributedandparalleldatabasesystem ,简称dpdbs )是分布式计算、并行处理以及网络技术相结合的产物,其不但对分散数据具有较强的管理能力,同时具有良好的性能。
Lock mechanism of that concurrency control can effectively void the dead - lock , two phase commit can guarantee atomicity of the distribute transaction while distributed transaction is executed with which the consistency of the database system is guaranteed . the method of checking the inconsistent is mainly to track the update status of multiple repetitions when distributed and parallel database system is not busy , and to detect inconsistent early . consequently , system can be recovered to best status 数据库在执行分布式事务的时候,并发控制的锁机制可有效的预防分布式事务中的死锁现象,两阶段的提交协议可以保证分布式事务执行的原子性,从而有效地保证了分布式并行数据库系统的一致性,不一致性检测的方法主要是在保证系统非繁忙状态下对多个副本间的数据库的更新状态进行跟踪,也保证了数据库多个副本间不一致状态的及早发现,从而使系统及时地恢复到最佳运行状态,提高了分布式并行数据库系统的可用性。