PostgreSQL, often simply Postgres, is an object-relational database management system with an emphasis on extensibility and standards compliance.
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Security: PostgreSQL has ROLES and inherited roles to set and maintain permissions. PostgreSQL has native SSL support for connections to encrypt client/server communications. It also has Row Level Security.
Performance: PostgreSQL is widely used in large systems where read and write speeds are crucial and data needs to validated. In addition, it supports a variety of performance optimizations that are available only in commercial solutions such as Geospatial data support, concurrency without read locks, and so on (e.g. Oracle, SQL Server).
Community Support: PostgreSQL has a very strong and active community that constantly improves existing features while its innovative committers strive to ensure it remains the most advanced database with new cutting-edge features and security.
Cloud Hosting Suports: Supported by all major cloud service providers, including Amazon, Google, & Microsoft.
ACID Compliance: PostgreSQL is ACID compliant from ground up and ensures that all requirements are met.
License: Linking from code with a different license: Yes
License: Copyleft: No
License: GPL compatible: Yes
License: OSI approved: Yes
License: FSF approved: Yes
License: DFSG compatible: Yes
Developer: PostgreSQL Global Development Group
Initial release: 8 July 1996
Size: Linux: 116Mb
Size: Windows: 150Mb
Size: MacOs: 124Mb
Source model: Open source
Written in: C
Access Methods: Supports all standards