Understanding Data Models: Benefits, Trade-offs, and History

Short summary

An overview of the object-relational impedance mismatch and the evolution of data models from hierarchical (IBM IMS) to relational to document-based (JSON). Discusses trade-offs between SQL multi-table schemas and JSON document storage, including locality benefits, schema flexibility, and update costs. Recommends keeping documents small and avoiding size-increasing updates.

• •Object-relational mismatch creates translation friction between OOP code and relational databases
• •JSON document models offer better locality and schema flexibility but complicate updates and many-to-many relationships
• •Historical parallels exist between 1970s hierarchical databases and modern document stores

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