I have frequent 500 errors due to exceeding number of connections to my DB. This results in errors like this in /logs: Job exception: FATAL: remaining connection slots are reserved for non-replication superuser connections My config: UNICORN_WORKERS: 12 UNICORN_SIDEKIQS: 2 DISCOURSE_DB_POOL: 90 …

Did you change sidekiq threads manually? I believe the default is 25, and you have 2 process, so 50 connections, only with sidekiq.

At high loads I strongly recommend running pgbouncer, how is your db configured?

I would have to check, but /sidekiq reports only 5 threads per sidekiq: [imagem]

Each web runs multiple threads as well, the numbers add up real quick

I have a data container running on a second server. I have changed the data.yml to expose db and redis ports and to give some extra memory: db_shared_buffers: "8GB" db_work_mem: "100MB"

[imagem] sam: Each web runs multiple threads as well, the numbers add up real quick I have 25 connections from unicorn workers and over 70 from sidekiqs.

Restarting the web_only container doesn’t solve the problem, it seems like sidekiq connection persist. Restarting the data container solvers the problem for another couple of days. It seems like there are some issues with sidekiq connections.

[imagem] TomekB: It seems like there are some issues with sidekiq connections. Interesting. We are usually internally totally shielded from this bug cause we use pg bouncer, but we will have a look internally to see if we see similar leaks. :man_farmer:t4: Can you debug into the “connections…

How do you rotate connections with pgbouncer (session pooling, transaction pooling)? I will try to debug these stalled connections but I think most of them were idle.

We use transaction pooling, session pooling is a no-go with Rails.

Too many connections to DB, how to optimize

Support

tgxworld (Alan Tan) Julho 27, 2017, 7:02am 18

Just updated the description with our README

Tópico		Respostas	Visualizações
Primary Postgres database process (postmaster) eating all CPU Self-hosting server-resources	13	4462	28 de Maio de 2020
Discourse Crash due to PSQL connection issue Self-hosting	9	589	17 de Março de 2024
Understanding DB Pooling for Sidekiq Workers Development	6	843	6 de Março de 2025
Very slow Sidekiq issue with large queue due to massive numbers of unread user notifications Self-hosting	68	8314	11 de Abril de 2020
"Your Redis network connection is performing extremely poorly" Self-hosting	6	826	16 de Fevereiro de 2026

Too many connections to DB, how to optimize

Tópicos relacionados