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I don't have experience with Rails, but I have experience with the other runtimes. I read their comment as needing an external database pool to scale, not that

I don't have experience with Rails, but I have experience with the other runtimes. I read their comment as needing an external database pool to scale, not that they don't need a pool. When running JVM or the other runtimes, the database pool can be part of the application itself because it uses a different threading model.

choilive 2y ago
Rails also has an application level connection pool for the database but as I understand a connection pooler (pgbouncer et al) between PG and the application servers is still necessary when horizontally scaling.