期刊名称：International Journal of Engineering and Computer Science
印刷版ISSN：2319-7242
出版年度：2015
卷号：4
期号：5
页码：12188-12193
出版社：IJECS
摘要：The two phase commit (2pc) protocol is widely used for commit processing in distributed data base system (DDBSs). The blockingproblem in 2pc reduces the availability of the system as the blocked transaction keeps all the resources until receive the final command from thecoordinator after its recovery. To remove the blocking in 2pc, three phase commit (3pc) protocol was proposed. Although 3pc protocol eliminatesthe blocking problem, it involves an extra round of message transmission, which degrades system performance in DDBSs. Both 2pc and 3pchaving problem which degrades system efficiency .In order to remove this problem in 2pc and 3pc ,E2PCP protocol was introduce to enhancesystem performances as compare to 2pc and 3pc.To reduce blocking, we propose an extended two phase commit protocol (E2PCP) by attaching multiple participant sites to the coordinator siteswork as a backup sites or as substitute sites for coordinator sites. In this protocol, after receiving responses from all participant sites in the firstphase, the coordinator communicates the final decision to the backup sites in the back phase. Afterward, it send final decision to the participants.When blocking occur due to failure of coordinator site, the participant site can terminate the transaction by consulting backup sites of thecoordinator. In this way E2PCP protocol achieving non-blocking in most of coordinator sites failures
