Total Next: Lesson 2 → Polyglot storage - OK The choice depends on the task In a production environment, several DBMSs work together, each performing its own task First, the nature of the data, the cost of an error, and the load profile—then the name of the DBMS Flexibility always comes at a price A single source of truth The other repositories are derived from it and must cope with its loss A scheme failure is handled by a manual integrity check in the application code