Microservices should not share the same data store. Sharing data representation can make altering the database very difficult, and even if done, such a change always runs the risk of causing failure to services that are still using the old data representation. Such challenges ultimately lead to a bloated and complex database and accumulation of lots of dead data over time.

Data replication is a possible solution to sharing data across Microservices. However, data should not be blindly replicated across Microservices as the same problems that are present with shared databases would still remain. A custom transformation process should convert data available from the database to the schema used by the data store of the Microservice. The replication process can be triggered in batches or on certain events in the system.