Virtualized web application servers within computational clouds, such as the Google App Engine, generally restrict resource usage and therefore provide limited, relationally none-complete query facilities only. This work investigates how scalable, reliable and a more powerful access to the App Engine Datastore can be accomplished and an Optimized Distributed Datastore Exchange (ODDSE) is presented. Being aware of the App Engines resource restrictions ODDSE provides a reliable and failure safe query interface to transparently exchange data with the distributed Datastore using the query...