Managing replicated data in heterogeneous database systems

In a heterogeneous database system, supporting transaction semantics is expensive, and sometimes impossible. thus, in such systems, traditional methods such as quorum consensus cannot be used directly for managing replicated data. A method to manage replicated data in a heterogeneous database system is proposed. The method is based on the idea of quorum consensus but does not rely on transaction semantics. It is more robust than the other methods introduced in the literature, and can be used in systems where one copy serializability is the correctness criteria