Multidatabase recoverability and recovery

To support global transactions in a multidatabase environment, one must coordinate the activities of multiple database management systems, that were designed for independent, stand-alone operation. The autonomy and heterogeneity of these systems present a major impediment to the direct adaptation of transaction management mechanisms developed for distributed database systems. This paper addresses the problems in multidatabase recovery. Most solutions proposed to provide multidatabase recovery are either allow incorrect results or place severe restrictions on global and local transactions. To assure that multidatabase recovery preserves the consistency of a multidatabase system. The author introduces a multidatabase recoverability requirement. He also describes a recovery mechanism that takes advantage of the local recovery in the participating database systems by minimizing the replication of recovery tasks