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notify Signal all frontends and backends listening on a relation
notify relation_name
notify is used to awaken all backends and consequently all frontends listening on the relation relation_name. This can be used either within a tuple level rule as part of the action body or from a normal query. When used from within a normal query, this can be thought of as IPC. When used from within a rule, this can be thought of as the alerter mechanism.
definerule(commands), listen(commands), libpq.