MariaDB is considered as the fork(replica) of MySQL database. It was developed by the same developer as that of MySQL except for the fact MariaDB offers many more additional functionalities to the MySQL engine.
PostgreSQL is an alternative to MySQL working on ORDBMS (Object-Relational Database Management System). As a database server, its primary function is to store data, securely and supporting best practices, and retrieve it later, as requested by other software applications, be it those on the same computer or those running on another computer across a network. The said architecture has many advantages over MySQL in areas of performance and redundancy.
MongoDB is a cross-platform document-oriented database. Its a specialized DB build on non-relational document store architecture similar to JSON and support any type of file or elements. It offers higher speed of processing data and less response time for some specified application.
The three databases are used at a variety of application depending on the need. Here are some of the basic difference between them.
Database Comparison: PostgreSQL vs MariaDB vs MongoDB
| Feature | PostgreSQL | MariaDB | MongoDB |
|---|---|---|---|
| Database Type | Relational (SQL) | Relational (SQL) | NoSQL (Document) |
| Data Model | Tables & rows | Tables & rows | JSON-like documents |
| Schema | Strict | Strict | Flexible |
| Best For | Complex queries, analytics | Web apps, transactions | Big data, real-time apps |
| Performance | Strong for complex queries | Fast for read-heavy workloads | Scales horizontally |
| Scalability | Vertical + extensions | Vertical + replication | Native horizontal scaling |
| ACID Compliance | Yes | Yes | Yes (since v4.0) |
| Replication | Streaming, logical | Master-slave, cluster | Built-in replica sets |
| Indexing | Advanced | Standard | Flexible & compound |
| JSON Support | Native + powerful | Basic | Native format |
| Full-Text Search | Yes | Yes | Yes |
| Learning Curve | Moderate | Easy | Moderate |
PostgreSQL – Best for Complex Applications
Strengths
- Advanced SQL compliance
- Powerful indexing & query planner
- Strong JSON + relational hybrid capability
- Ideal for analytics, fintech, enterprise apps
Weakness
- Slightly heavier resource usage
Use When
- You need advanced queries or reporting
- Data integrity is critical
- You require extensibility
MariaDB – Best MySQL-Compatible Alternative
Strengths
- Drop-in replacement for MySQL
- Lightweight and fast
- Strong replication options
- Easy to manage
Weakness
- Fewer advanced analytics features than PostgreSQL
Use When
- You need speed + simplicity
- Hosting web apps or CMS platforms
- Migrating from MySQL
MongoDB – Best for Flexible & Scalable Systems
Strengths
- Schema-less design
- Horizontal scaling by default
- Handles unstructured data easily
- High performance for large datasets
Weakness
- Complex joins are harder than SQL systems
Use When
- Building real-time apps
- Handling large or evolving datasets
- Developing microservices or APIs
Quick Selection Guide
| If You Need… | Choose |
|---|---|
| Enterprise-grade relational DB | PostgreSQL |
| Fast web database | MariaDB |
| Flexible scalable database | MongoDB |
| Analytics + structured data | PostgreSQL |
| Rapid development + schema flexibility | MongoDB |
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