Re: Vacuum message

Kevin Barnard <kevin.barnard@gmail.com> writes:
> I know I've seen this message before but I'm not quite sure what it
> means.  I think it's because I have two vacuums running over each
> other.  Does this sound right?  It's comming from 7.4.x server.

> ERROR:  tuple concurrently updated

Were they both VACUUM ANALYZEs?  There's a known gotcha that if you
ANALYZE the same table concurrently in two different sessions, one
of them can fail this way when it goes to update the pg_statistic
entries.  (Harmless, but annoying.)  I don't know of any cause for
this message from a plain VACUUM though.

            regards, tom lane