PostgreSQL vs MySQL: Which Database Is Better?
Complete comparison: features, performance, ACID compliance, JSON support, scaling, and which fits your application needs.
Quick Comparison
| Aspect | PostgreSQL | MySQL |
|---|---|---|
| ACID Compliance | Full (multi-version concurrency) | Partial (depends on storage engine) |
| Transaction Support | Full ACID transactions | Full ACID (InnoDB), not MyISAM |
| JSON Support | Native JSONB (queryable & indexed) | JSON (read-only) |
| Data Types | 200+ (UUID, arrays, custom types) | Basic types only |
| Performance | Slower on simple queries (overhead) | Faster on simple reads |
| Replication | Streaming replication (advanced) | Binary log replication (simple) |
| Scaling | Vertical (single server) | Horizontal (read replicas easy) |
| Community Support | Smaller but active open-source | Larger community (WordPress) |
PostgreSQL: Feature-Rich & Reliable
PostgreSQL (Postgres) is advanced with full ACID compliance, native JSON support, and rich data types. Better for complex data, strict consistency needs, and applications requiring advanced features. Slightly slower on simple operations but more reliable for critical systems.
MySQL: Simple & Fast
MySQL is simple, fast for read-heavy workloads, and widely used (WordPress, Facebook scale with it). InnoDB storage engine provides full ACID compliance. Best for web apps with mostly reads and horizontal scaling via read replicas.
Performance: Query Execution Comparison
Simple SELECT (1M rows)
PostgreSQL: 150ms (optimization overhead)
MySQL: 80ms (faster on simple)
Complex JOIN (5 tables)
PostgreSQL: 200ms (better query planner)
MySQL: 400ms (struggles with complex)
JSON field query (JSONB search)
PostgreSQL: 100ms (native & indexed)
MySQL: Not directly queryable (requires extraction)
Read replica load distribution
PostgreSQL: Manual (harder setup)
MySQL: Easier (standard approach)
Choose PostgreSQL If:
Choose MySQL If:
Frequently Asked Questions
Can I switch from MySQL to PostgreSQL later?
Yes, but requires migration effort. Tools like pg_chameleon help. Plan migration if you anticipate needing Postgres features.
Is PostgreSQL safe for financial/banking systems?
Yes, PostgreSQL is bank-grade. Full ACID compliance makes it ideal for financial transactions. MySQL (InnoDB) works but Postgres safer.
Which is cheaper to run?
Similar. Both open-source, free. PostgreSQL slightly heavier (more RAM). MySQL simpler ops. Costs similar at scale.
Does MySQL 8 match PostgreSQL features?
Getting closer, but PostgreSQL still ahead. MySQL 8 has window functions and CTEs. But Postgres has more: JSON querying, arrays, custom types.
What if I can't decide?
Start PostgreSQL for new apps (more features, room to grow). Use MySQL if building WordPress or content site (larger community).
Verdict: Choose Based On Your Situation
PostgreSQL
- You need advanced SQL features (JSON, arrays, CTEs, window functions)
- You want strict ACID compliance for complex transactions
- You need full-text search or geospatial queries (PostGIS)
- You're building complex relational systems with intricate joins
MySQL
- You want simplicity and widespread hosting support
- You're building web applications with standard CRUD operations
- You need fast reads with simpler schema (OLAP workloads)
- You prefer easier horizontal scaling for read-heavy workloads
Related Concepts
Related Tools
Database Performance Benchmark
Compare query performance between PostgreSQL and MySQL.
Schema Designer
Design and optimize database schemas for both databases.