Re: is pg_stat_activity "transactional"? How fast does it update?

On Tue, Jun 10, 2025 at 5:46 PM Dominique Devienne <ddevienne(at)gmail(dot)com> wrote:
> On Tue, Jun 10, 2025 at 4:27 PM Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> > PQfinish is asynchronous: [...]
> > [...] pg_stat_activity() takes a snapshot of the view's contents
> Many thanks Tom. Didn't know either of those facts.

Hi. I ended up polling pg_stat_activity to wait for the disappearance
of the backend, to avoid the race in my unit tests. Initially
pg_stat_clear_snapshot() seemed to help, but then it didn't. Not
ideal, but I don't see any solution (work-around, really). There's a
new LOGIN event trigger, but no symmetrical FINISH one, and those are
restricted to privileged users, so useless in my case. Oh well. --DD