PostgreSQL vs MySQL：2026年技术选型深度对比
PostgreSQL vs MySQL: In-Depth Technical Comparison for 2026
| iDev Tech | 2026-07-28T10:00:00
从架构设计、性能特征、生态系统和运维成本四个维度全面对比PostgreSQL和MySQL。
Comprehensive comparison of PostgreSQL and MySQL across architecture, performance, ecosystem, and operational cost.
架构差异PostgreSQL采用MVCC实现事务隔离，使用UNDO log实现多版本；MySQL InnoDB同样使用MVCC但实现方式不同。PostgreSQL原生支持JSON/JSONB、数组、范围类型等丰富数据类型；MySQL的JSON支持在8.0后显著改善但仍不如PostgreSQL灵活。性能特征简单的OLTP读写：MySQL略优（5-15%），特别是高并发短查询场景。复杂查询和分析：PostgreSQL显著优于MySQL，其查询优化器更智能，支持并行查询、CTE、窗口函数等高级特性。写密集场景：两者相当，但PostgreSQL在大事务处理上更稳定。选型建议选MySQL：团队已有MySQL经验、业务以简单CRUD为主、需要极致的读性能。选PostgreSQL：需要复杂查询和数据分析、使用JSON文档存储、需要地理空间数据（PostGIS）、对数据完整性要求极高。
Architecture DifferencesPostgreSQL implements transaction isolation via MVCC using UNDO logs for multi-versioning; MySQL InnoDB also uses MVCC but with different implementation. PostgreSQL natively supports JSON/JSONB, arrays, range types, and other rich data types; MySQL's JSON support improved significantly in 8.0 but remains less flexible.Performance CharacteristicsSimple OLTP reads/writes: MySQL slightly ahead (5-15%), especially in high-concurrency short query scenarios. Complex queries and analytics: PostgreSQL significantly outperforms MySQL with a smarter query optimizer, parallel queries, CTEs, and window functions. Write-intensive scenarios: comparable, but PostgreSQL is more stable with large transactions.Selection AdviceChoose MySQL: existing team expertise, simple CRUD-focused applications, need extreme read performance. Choose PostgreSQL: complex queries and analytics needed, JSON document storage, geospatial data (PostGIS), highest data integrity requirements.