connection pool : Java Glossary

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connection pool
The term is used in two main contexts: In a simple system, you create a fresh connection for each transaction. However, there is a fair overhead for doing that, so instead you can create a set of connection objects and place them in a pool and recycle them. Having a fintite pool is also a way of preventing the number of simultaneous threads from growing without bound. In some databases, you pay extra for the extra connections, so you work to squeeze everything through one or a small number of connections.

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