GUC - Grand Unified Configuration
PostgreSQL's configuration system
GUC ("Grand Unified Configuration") is PostgreSQL's configuration system.
The Grand Unified Configuration (GUC) system was introduced in PostgreSQL 7.1 as a way to control PostgreSQL at various levels (commit 6a68f426).
Implementation
Basic overview in src/backend/utils/misc/README (direct link: src/backend/utils/misc/README).
References
- PostgreSQL documentation: Setting Parameters via the Configuration File
- PostgreSQL documentation: Parameter Interaction via SQL