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1 : a pair of messages that consists of a primary message and its associated secondary message, if any. NOTE-A transaction is opened when a primary message is ready to be sent and is closed when the last block of a primary message requesting no reply has been sent or when the last block of the reply has been received. A number of transaction-level requirements are specified by SECS-II. [SEMI E4-91 and E5-92] Also see transaction timeout . 2 : in database management systems, a number of individual data updates that must either be completely performed as a group, or all rolled back, in order to leave the database in a consistent state.
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