On Wed, Jun 03, 2020 at 04:04:13PM -0400, Philip Semanchuk wrote: > Can anyone help me understand why this happens, or where I might look for clues? What version postgres ? Can you reproduce if you do: ALTER SYSTEM SET max_parallel_workers_per_gather=0; SELECT pg_reload_conf(); .. and then within the session do: SET max_parallel_workers_per_gather=12; I guess you should show an explain analyze, specifically "Workers Planned/Launched", maybe by linking to explain.depesz.com -- Justin
