On the heterogeneity of distributed databases integrating commit protocols

Explores atomic commitment among heterogeneous distributed databases. Two cases are considered, one where the individual databases participating in the system do not externalize their commit protocols, and one where the participating databases do externalize their commit protocols. With regard to the latter case, I propose new heterogeneous commit protocols, one for joining databases that have different 2-phase commit protocols, and one for uniting databases which employ a 3-phase protocol with others employing a 2-phase commit protocol