On Thu, Jul 22, 2021 at 04:16:34PM +0000, ldh@xxxxxxxxxxxxxxxxxx wrote: > Is it fair then to deduce that the total memory usage would be 2,400,305kB + 126,560kB? Is this what under the covers V11 is consuming more or less? It might be helpful to know how much RAM v11 is using. Could you run the query with log_executor_stats=on; client_min_messages=debug; The interesting part is this: ! 7808 kB max resident size -- Justin