> I'm not an expert on signals, not even a novice, so I might be totally
> off base, but it seems like the Async Notification implementation does
> not scale.
Very possibly. You didn't even mention the problems that would occur if
the pg_listener table didn't get vacuumed often enough.
The pghackers archives contain some discussion about reimplementing
listen/notify using a non-table-based infrastructure. But AFAIK no one
has picked up that task yet.
regards, tom lane
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