> Possibly you got bit by the recently-fixed LISTEN/NOTIFY race condition? > http://archives.postgresql.org/pgsql-bugs/2008-03/msg00094.php > IIRC this could only be a problem if your listener had only just started > listening, though. - Geez, I realize I forget to state the version I'm using: 3.1. - I had been doing all my testing from a cold start-up. But when I go back now and keep testing over & over, I keep seeing the problem over & over. But reading the report you linked to, it *does* seem to me like it describes my problem, and that it could happen any time, not just soon after starting a listen. If this gets fixed in a near-term release I'm good. Right now, I can kludge around it with a double-query of the modified table--because right now the usage patterns are such that I don't think this will ever skip an update. (Longer-running updates, or a heavier load, and I might have a bigger problem.) Four years of using PostegreSQL, and finally there's a bug that actually affects the correct operation of my software. Not too shabby ;-) -- Scott Ribe scott_ribe@xxxxxxxxxxxxxxx http://www.killerbytes.com/ (303) 722-0567 voice