Reliability is the probability that the entire transaction can execute properly without failure.
Tradeoffs between distributed database query and update are derived in terms of both performance and reliability. The increasing availability and importance of distributed databases raises serious concerns about their dependability in a fragile network environment, much more than with centralized databases. Although the major impetus for distributed databases is to increase data availability, it is not always clear whether the many components of a distributed system provide the desired dependability. Performance of a database system is closely related to dependability. CITI's goal is to provide that transformation with a realistic set of system parameters, test the model with a simulation tool, and make recommendations for validation testing with actual distributed database management systems.