Should You Go Beyond Relational Databases?
Briefly

Relational databases like MySQL and PostgreSQL are reliable but may not suit every application in today’s evolving technology landscape. Assess your needs before choosing a model.
Many applications function well on relational databases for years. However, signs such as sparse tables, serialization of data, and complex joins may indicate it's time to consider alternatives.
Performance issues, including write bottlenecks and large data volumes, can signal the limits of relational databases, prompting a need to explore other database technologies.
Frequent schema changes and complex relationships in your database schema might suggest you're pushing the limits of the relational model and should evaluate other options.
Read at Treehouse Blog
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