zlacker

>>bo0tzz+(OP)
Few things.

1. The main downside to using PostgreSQL as a pub/sub bus with LISTEN/NOTIFY is that LISTEN is a session feature, making it incompatible with statement level connection pooling.

2. If you are going to do this use advisory locks [0]. Other forms of explicit locking put more pressure on the database while advisory locks are deliberately very lightweight.

My favorite example implementation is que [1] which is ported to several languages.

[0] https://www.postgresql.org/docs/current/explicit-locking.htm...

[1] https://github.com/que-rb/que

>>jpgvm+La
One reason that makes me dislike NOTIFY/LISTEN is that issues with it are hard to diagnose.

Recently I had to stop using it because after a while all NOTIFY/LISTENS would stop working, and only a database restart would fix the issue https://dba.stackexchange.com/questions/325104/error-could-n...

>>MrPowe+Vz
At my previous company, they switched from using NOTIFY/LISTEN for Postgres notifications to a custom solution built on top of logical replication. As I understand it, part of the reason was reliability. I never touched that part of the code, but I believe the idea was to subscribe to logical replication updates and send out notifications based on these.