What Is GUC (Grand Unified Configuration)?
GUC is the internal name for PostgreSQL configuration parameters. These include runtime options like work_mem and shared_buffers . You can set GUCs in postgresql.conf or via SQL.
Why It Matters for PostgreSQL Performance
In PostgreSQL performance work, GUC (Grand Unified Configuration) affects throughput, latency, or operational reliability depending on workload and configuration.
Practical Benchmarking Context
When benchmarking with pgbench, track how GUC (Grand Unified Configuration) changes behavior across scale factor, client concurrency, and storage conditions.
Use this term together with workload shape, concurrency level, and scale factor when interpreting pgbench outputs. Isolated values can be misleading without full run context.
Example
Command: SET work_mem = '64MB';