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MicroDB is a distributed data store for providing highly available, isolated data access to existing R-DBMS or other data stores designed for a service-oriented architecture. This paper describes the motivation behind MicroDB, the design and implementation of its access and replication layers, and how it can aid in tackling challenges associated with migrating to a full service-oriented architecture from a monolithic architecture. Lastly, we will present experimental results and comparisons with existing solutions.