Site-locking protocol for global concurrency control in multidatabase systems

Much research into managing global transactions in multidatabase systems (MDBS) has been proposed to solve problems of ensuring global serializability. In these methods, a few opportunities are provided to the global transaction to execute concurrently. We concentrate our attention on 1) maintaining a consistent database state that is defined by global integrity constraints, and 2) investigation into the more accurate indirect conflict situation so that the global transaction manager (GTM) of MDBS provides a higher degree of concurrency. In this paper, we propose a site-locking concurrency control method in MDBS. In our method more global transactions can be concurrently executed, since the refined boundary of possibility of indirect conflict is offered.