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Pools start out empty and grow as necessary to a maximum size (default is 5, configure size with key 'pool' in your database configuration). If no connections are available, a thread will wait up to a 'wait_timeout' time (default is 5 seconds). Connections are verified and reset when checked out from the pool (usually upon first access to ActiveRecord::Base.connection), and returned back to the pool after each request. If you would like to use connection pools outside of ActionPack, there is an ActiveRecord::Base.connection_pool method that gives you access to the pool, and you can manually checkout/checkin connections, or supply a block to ActiveRecord::Base.connection_pool.with_connection which takes care of the checkout/checkin for you. [#936 state:resolved]