On Thu, Dec 27, 2018 at 08:20:23PM -0500, Jeff Janes wrote: > Also, you would want to use the newest version of PostgreSQL, as 9.6 > doesn't have parallel query, which is much more generally applicable than > effective_io_concurrency is. It *does* have parallel query (early, somewhat limited support), but not enabled by default. https://www.postgresql.org/docs/9.6/parallel-query.html There was some confusion due to being disabled in 9.6, only: https://www.postgresql.org/message-id/20180620151349.GB7500%40momjian.us Cheers, Justin