Legacy databases — or relational databases, aka RDBMS — were built for well-mapped, stable, and predictable processes like finance and accounting. These databases use rigid rows, columns, and tables that don’t require frequent modifications, but when the database model does need to change, it’s a big and expensive undertaking. 

Today, when building software applications, business and user requirements change often. Yet, most legacy database software fights against these changes rather than evolving with them.

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