Data Consistency
In our monolithic application, all data can be stored in a single database, and even if we partitioned it, we probably partitioned the data in such a way that we could still use the database to enforce referential integrity and use transactions. In our microservices application, the data is probably distributed across multiple databases, and in addition, they may be entirely different types of databases.
As we decentralize our data and move to a model where each service has its own schema or database, this causes data consistency and integrity challenges that can be hard to solve. Data in one service can reference data in another service where maintaining integrity between both is important, and if data changes in one database, ...
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