Susan Cassidy wrote:

> Any explanations or ideas?  The processing works, because other iterations
> of the program are constantly running, so the next attempt returns data, and
> runs as normal.  However, it bugs me that sometimes a query that should work
> is returning no results, for no discernable reason.

In a producer-consumer model, at some point in time there should be between 0
and N items to consume. 0 item is no more weird than 1, or 2, or any other
particular value.
Personally, I would find it weird if a consumer process never had nothing to
do. I would see this as a hint that the producer is over-producing.

Best regards,
-- 
Daniel
PostgreSQL-powered mail user agent and storage: http://www.manitou-mail.org

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