What Is Data Directory?
The data directory is the root folder where PostgreSQL stores its data files, including WAL, configuration, and user data. It’s initialized using initdb and must be secured and monitored.
Why It Matters for PostgreSQL Performance
In PostgreSQL performance work, Data Directory affects throughput, latency, or operational reliability depending on workload and configuration.
Practical Benchmarking Context
When benchmarking with pgbench, track how Data Directory 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
Location: Default is /var/lib/postgresql/data on many systems.