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What is database connection pooling?

A connection pool keeps a small set of open database connections and shares them between requests.

Last updated November 9, 2026

The short version

A connection pool keeps a small set of open database connections and shares them between requests. Opening a connection is slow, and databases allow only a limited number. Without a pool, or with one set too large, an app can run out of connections under load. Most apps need far fewer connections than developers expect.

On EasyHost

Each EasyHost database allows 20 connections, so a pool of about 5 per app is a sensible start. Learn more.

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