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Decide whether to manually set dyno counts or enable auto‑scaling on Scalingo by comparing cost, control, responsiveness. This guide outlines constraints, trade‑offs, and a concrete YAML example to help you pick the right strategy.
Your app fails with connection refused errors when total simultaneous connections exceed Heroku Postgres max_connections. Compute the budget upfront, size pools small, and plan for deploy doublings and failovers.
Heroku gives you two scaling levers — bigger dynos or more dynos — and they solve different problems. Here's how to tell which one your app actually needs, and the database bottleneck neither one fixes.
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