1. MariaDB：
MariaDB是一个开源关系数据库管理系统(RDBMS)，它是广泛使用的MySQL数据库技术的兼容即插即用替代品。它由MariaDB基金会开发，最初于2009年10月29日发布。MariaDB具有大量新功能，因此在性能和面向用户方面比MySQL更好。
2. PostgreSQL：
PostgreSQL是一个功能强大的开源对象关系数据库系统。它具有较高的稳定性，因此可以在较低的维护工作量下提供良好的性能。 PostgreSQL是第一个实现多版本并发控制(MVCC)功能的DBMS。
MariaDB和PostgreSQL之间的区别：
| S.NO. | MARIADB | POSTGRESQL |
|---|---|---|
| 1. | Developed by MariaDB Corporation Ab and MariaDB Foundation on 2009. | Developed By PostgreSQL Global Development Group on 1989. |
| 2. | It is a MySQL application compatible open source RDBMS, enhanced with high availability, security, interoperability and performance capabilities. | It is widely used open source RDBMS. |
| 3. | MariaDB is written in C and C++ languages. | PostgreSQL is written in C languages. |
| 4. | The primary database model for MariaDB is Relational DBMS. | Also the primary database model for PostgreSQL is Relational DBMS. |
| 5. | It has two Secondary database models – Document store and Graph DBMS. | It has Document store as Secondary database models. |
| 6. | Server operating systems for MariaDB are FreeBSD, Linux, Solaris and Windows. | Server operating systems for PostgreSQL are FreeBSD, HP-UX, Linux, NetBSD, OpenBSD, OS X, Solaris, Unix and Windows. |
| 7. | It supports Server-side scripting. | It has user defined functions for Server-side scripts |
| 8. | Supported Partitioning method are – Horizontal partitioning, sharding with Spider storage engine and Galera cluster. | In PostgreSQL, partitioning can be done by range, list and hash. |
| 9. | It support two replication methods – Master-master replication and Master-slave replication. | It support only one replication methods – Master-master replication |
| 10. | It supports in-memory capabilities. | It does not supports in-memory capabilities. |