Overview
PostgreSQL is an object-relational DBMS focused on extensibility and SQL standard compliance. MariaDB is a community-developed fork of MySQL, emphasizing performance and backward compatibility.
| Parameter | PostgreSQL | MariaDB |
|---|---|---|
| License | PostgreSQL License (BSD) | GPL v2 |
| DBMS Type | Object-relational | Relational |
| JSON Support | JSONB (binary, indexed) | JSON via functions (textual) |
| Replication | Logical, physical, synchronous | Master-Slave, Galera Cluster |
| Extensibility | High (plugins in C, Python, Rust) | Limited to storage engines |
Performance
PostgreSQL handles complex queries with multiple JOINs and analytical tasks more efficiently due to its advanced query planner and parallel execution. MariaDB excels in simple read-write operations (OLTP) by utilizing MyRocks and Aria storage engines, along with an optimized Thread Pool for high concurrency.
Configuration & complexity
Configuring PostgreSQL requires tuning parameters like shared_buffers, work_mem, and maintenance_work_mem. Access control is managed via pg_hba.conf. MariaDB is easier for initial setup as a drop-in replacement for MySQL. Primary settings reside in my.cnf, with innodb_buffer_pool_size being the critical factor.
When to choose what
- PostgreSQL: Complex financial systems, GIS (PostGIS), bioinformatics, high-load analytical platforms.
- MariaDB: Web applications, CMS (WordPress, Drupal), migration from legacy MySQL, projects requiring multi-master replication via Galera.
Cost / licensing
PostgreSQL is distributed under a liberal license allowing closed-source commercial forks. MariaDB uses GPL, which mandates opening source code changes when distributing derivative software. Both are free for infrastructure deployment.
Ecosystem & integrations
The PostgreSQL ecosystem includes TimescaleDB for time-series and Citus for sharding. MariaDB offers ColumnStore for columnar data storage and native support for MaxScale for load balancing and proxying.
Verdict
Choose PostgreSQL if data integrity, complex types (arrays, JSONB), and extensibility are priorities. Choose MariaDB for standard web workloads requiring simple read scaling and full compatibility with the MySQL ecosystem.