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Postgres LISTEN/NOTIFY does not scale

(www.recall.ai)
570 points davidgu | 2 comments | 07 Jul 25 14:05 UTC | HN request time: 0.489s | source
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polote ◴[10 Jul 25 20:38 UTC] No.44525307[source]▶
Rls and triggers dont scale either
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shivasaxena ◴[10 Jul 25 21:12 UTC] No.44525677[source]▶
Yeah, I'm going to remove triggers in next deploy of a POS system since they are adding 10-50ms to each insert.

Becomes a problem if you are inserting 40 items to order_items table.

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1. nine_k ◴[10 Jul 25 23:48 UTC] No.44526964[source]▶
Hmm, imho, triggers do scale, they are just slow. But as you add more connections, partitionss, and CPUs, the slowness per operation remains constant.
replies(1): >>44530474 #
2. ants_a ◴[11 Jul 25 10:20 UTC] No.44530474[source]▶
Triggers are not even particularly slow. They just hide the extra work that is being done and thus sometimes come back to bite programmers by adding a ton of work to statements that look like they should be quick.