Hi, On Tue, Jun 11, 2024 at 02:48:30PM -0400, Robert Haas wrote: > On Tue, Jun 11, 2024 at 2:47 PM Nathan Bossart <nathandboss...@gmail.com> > wrote: > > I'm struggling to think of a scenario in which the number of waits would be > > useful, assuming you already know the amount of time spent waiting.
If we provide the actual time spent waiting, providing the number of waits would allow to see if there is a diff between the actual time and the intended time (i.e: number of waits * cost_delay, should the cost_delay be the same during the vacuum duration). That should trigger some thoughts if the diff is large enough. I think that what we are doing here is to somehow add instrumentation around the "WAIT_EVENT_VACUUM_DELAY" wait event. If we were to add instrumentation for wait events (generaly speaking) we'd probably also expose the number of waits per wait event (in addition to the time waited). Regards, -- Bertrand Drouvot PostgreSQL Contributors Team RDS Open Source Databases Amazon Web Services: https://aws.amazon.com
