Transaction codes (tc) consist of three digits They are used to identify a transaction being processed and to maintain a history of actions posted to a taxpayer’s account on the master file. Concurrent execution of user programs is essential for good dbms performance Intuitively, the first transaction is transferring $100 from b’s account to a’s account The second is crediting both accounts with a 6% interest payment In this chapter, we review more closely what we mean by a transaction, we look at the evolution of transaction processing, and we then consider how it differs from other types of information processing.
Database system concepts, 6th ed A transaction is a unit of program execution that accesses and possibly updates various data items. As used herein, a transaction means a transaction resulting from the use of a mastercard®, maestro®, or cirrus® card, access device, or account, as the case may be. Evolution of transaction processing systems the basic components of a transaction processing system can be found in single user systems The evolution of these systems provides a convenient framework for introducing their various features.
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