"John D. Burger" <john@mitre.org> writes:
> I decided to run a periodic vacuum on my work queue. Lo and behold,
> I get this:
> ERROR: tuple concurrently updated
Which PG version is this, and do you have autovacuum enabled? Awhile
back it was possible to get this error if autovac and a manual vacuum
hit the same table concurrently (the error actually stems from trying
to update pg_statistic concurrently during the ANALYZE phase).
> In addition, all of my workers locked up, apparently indefinitely.
[ squint... ] That shouldn't happen. Look into pg_locks to see if
you can determine who's waiting for what.
regards, tom lane