The choice between PostgreSQL and MySQL is one of the most common decisions facing developers and administrators deploying open-source database solutions. Both are mature, capable systems, but they differ significantly in their approach to standards compliance, extensibility, and feature sets.
Feature Comparison
PostgreSQL prioritizes standards compliance and advanced features like complex queries, foreign keys, triggers, and views. Its MVCC implementation provides excellent concurrent read/write performance without read locks. MySQL, particularly with the InnoDB engine, offers strong performance for simple read-heavy workloads and has a larger ecosystem of hosting providers and tools.
For applications requiring complex queries, geospatial data handling (via PostGIS), or strict data integrity enforcement, PostgreSQL is generally the stronger choice. MySQL excels in web applications with straightforward CRUD operations and benefits from widespread hosting support and a larger pool of experienced administrators.
Consider your team's expertise, hosting environment, and specific application requirements when making this decision. Both databases support replication, have active development communities, and receive regular security updates. The best choice is often the one your team knows best and can operate most effectively in your specific environment.