Matthias Apitz <guru(at)unixarea(dot)de> writes:
> We have a C-written program, written in ESQL/C, of our LMS where the logic
> crawls with FETCH through a hit list and does UPDATE on some rows which
> match certain condition. This works fine for thousands of rows every night,
> but magically sometimes it fails.
Maybe something else already updated the row since the cursor was opened?
That would change its CTID.
regards, tom lane