- Core Features
- PostgreSQL is a free, open-source relational database management system
- Supports ACID properties, triggers, foreign keys, and stored procedures
- Available on multiple operating systems including Windows, Linux, macOS
- Manages concurrency through multiversion concurrency control
- History
- Evolved from University of California, Berkeley's Ingres project (1982-1994)
- Renamed to PostgreSQL in 1996 to reflect SQL support
- Currently maintained by PostgreSQL Global Development Group
- Technical Capabilities
- Includes built-in binary and synchronous replication
- Supports various data types including JSON, XML, and geographic primitives
- Features extensive indexing infrastructure with multiple access methods
- Provides procedural languages and triggers for custom functionality
- Security and Performance
- Manages security on per-role basis with various authentication methods
- Claims high but not complete SQL standard compliance
- Demonstrates linear CPU scalability with multiple cores
- Performance improvements began with version 8.1
- Notable Users
- Used by Microsoft for Windows analytics
- Employed by Myspace, Geni.com, and OpenStreetMap
- Used by Skype, Instagram, and TripAdvisor
- Implemented in weather services like NOAA and Met Office