On Tue, Aug 16, 2011 at 11:53 PM, Sim Zacks <sim@compulab.co.il> wrote:

We are doing this same sort of thing now. If the transaction goes through,
the email record gets written to a table. We have a cron job that calls a
database function that processes all emails that have not been processed
yet. If the transaction gets rolled back, the email record does not get
written to the table and the email does not get sent.
In your scenario, if you send the NOTIFY message and then you roll back the
transaction, the helper application will still send the email. IOW, doing
this outside of the database can more easily break your transactional
integrity.

Notify hits on commit, right?

Best Wishes,
Chris Travers

My bad. I just tested this. Notify doesn't get send until after commit.