MySQL vs MongoDB: Relational vs Document Databases

MySQL organises data into related tables; MongoDB stores flexible JSON-like documents. It's not about which is better — it's about which model fits your data and access patterns.

Key Points

• MySQL: fixed schema, SQL, strong joins and transactions
• MongoDB: flexible documents, no joins by design (embedded data instead)
• Structured business data (orders, customers) → relational wins
• Rapidly evolving or nested data (event payloads) → documents shine
• MongoDB scales horizontally by default; MySQL scales up + read replicas
• Many stacks use both: MySQL for core records, MongoDB for flexible content