We propose a large-scale peer-to-peer database hosting system capable to efficiently replicate and manage databases accessed worldwide. This proposal is twofold: the transparent replication and management of database replicas over a peer-to-peer network, and the provision of a replica control middleware that guarantees the 1-copy snapshot isolation correctness criterion, thanks to a scheduler-based certification protocol. This paper focuses on the system architecture and how this architecture is deployed over a P2P network. Though the evaluation of our prototype is still under way, we argue that this database replica hosting system will boost the performance of database-intensive applications accessed by clients distributed world-wide.