Tokens are used to prepare a target database for replication from a source database and to confirm the preparation in an asynchronous coordinated commit replication process. During a dual write replication process, transmission of the replicated data and locking of data records in the target database...http://www.google.ca/patents/US7177866?utm_source=gb-gplus-sharePatent US7177866 - Asynchronous coordinated commit replication and dual write with replication transmission and locking of target database on updates only
