Reservation commitment and its use in multidatabase systems

Abstract

This paper discusses a new atomic commitment protocol, called reservation commitment, and its implementation in multidatabase systems. The implementation discussed does not require component systems to provide a visible prepare-to-commit state (as does two phase commitment) and does not require component system modification. The reservation commitment protocol will work for cases not handled by the compensation approach and can be used to increase the number of cases where compensation will work. Finally, The reservation commitment protocol avoids the blocking of local read-only transaction that occurs in two phase commitment, and can take advantage of data and transaction semantics to decrease the level of blocking of local update transactions.