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A '''Database connection''' is a facility in [[computer science]] that allows [[Client (computing)|client]] software to talk to [[database server]] software, whether on the same machine or not. A '''connection''' is required to send [[command (computing)|commands]] and receive answers, usually in the form of a result set.
Connections are a key concept in [[data-centric]] programming. Since some DBMS engines require considerable time to connect [[connection pooling]] was invented to improve performance. No command can be performed against a database without an "open and available" connection to it.
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