[PhoenixReborn]

The ORM connection pooler is client-side - so each instance of your application using SQLAlchemy will have its own connection pool. This may become unwieldy as you scale up the number of app servers/containers/processes.

In contrast, connection poolers like Odyssey or pgbouncer live external to your applications, meaning that:

1. You can connect to them from any application written in any language (not just Python) 2. They provide a global pool for all of the applications connecting and help to not overload Postgres.

[djbusby]

Why not python? Works on my machine.

[nh2]

I believe you read "just not Python", when the parent poster wrote "not just Python", meaning that a connection pooler can be used also from other languages besides Python, which don't have SQLAlchemy specifically.

[djbusby]

Oof. Yep. And the timer is over so I can't edit or delete :(