Journal of Networking Technology Sofiane Mounine HEMAM, Khaled Walid HIDOUCI 2 2 2011 http://www.dline.info/jnt/fulltext/v2n2/34.pdf We propose a decentralized approach to processing transactions in a replicated database, under partial replication in Peer-To-Peer (P2P) environments. In order to solve problems of concurrent updates, we propose an architecture based on quorums, this architecture allows assigning a unique timestamp to each distributed transaction in order to built local precedence order graph is from at each peer , to select the servers replicas and to coordinate the distributed execution of the transaction.