PostgreSQL is an open-source relational database management system (RDBMS) that can be acquired directly from postgresql.org or the GitHub mirror of the PostgreSQL GIT repository.
Due to its open-source nature , there are a number of PostgreSQL forks and deployment types. Some deployment types and forks are :
- PostgreSQL - The original open source object-relational database system.
- Greenplum Database - A PostgreSQL derived database licensed using Apache2 with a focus on analytics.
- EDB Postgres Advanced Server - A commercial fork of PostgreSQL developed and supported by EnterpriseDB. Offers improved security , performance and productivity tools.
- Postgres Pro DBMS - A commercial fork of PostgreSQL developed and supported by Postgres Professional. Offers improved performance, scalability and maintainability options.
- Postgres-X2 - A symmetric PostgreSQL cluster for scale out environments.