What is transaction?

transaction meaning (ANSI) (1) A command, message, or input record that explicitly or implicitly calls for a processing action, such as updating a file. (2) An exchange between and end user and an interactive system. (3) In a database management system, a unit of processing activity that accomplishes a specific purpose such as a retrieval, an update, a modification, or a deletion of one or more data elements of a storage structure.


reference: U.S . Food & Drug – Glossary of Computer System Software Development Terminology (8/95)