What Is Tuple?
A tuple is PostgreSQL's internal term for a row in a table. Multiple versions of a tuple may exist due to MVCC, especially during updates or deletes. Tuples are reclaimed through VACUUM operations to prevent storage bloat.
Why It Matters for PostgreSQL Performance
In PostgreSQL performance work, Tuple affects throughput, latency, or operational reliability depending on workload and configuration.
Practical Benchmarking Context
When benchmarking with pgbench, track how Tuple 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
Tool: pg_stat_user_tables shows dead tuples.