These types of systems are said to be transaction driven or event driven because the individual transaction triggers the processing activity and updates all relevant files.
Data communication is a combination of electronic data transmission and the computer. The complexity of data communication networks may vary from a few remote terminals linked to a microcomputer to a complex network utilizing time-sharing, on-line, real time and distributed processing system.
Through this system, electronic transactions and data files can be introduced, maintained, modified or accessed at locations distant from the central data processing installation. In order to get the idea how this system works – we would need to familiarize the following advanced computer terms such as:
On-line is used with two different meanings. Data files are said to be on-line if they are electronically available to the central processor and can be accessed without operator intervention. On-line also refers to a user who is connected to the central processor as described above under time-sharing. Data processing also is termed on-line (or direct access or random) when transactions can be input into computer processing from the point of origin without first being sorted.
Distributed processing refers to the situation when two or more computers handle the data processing. This is a form of extension of time-sharing, except that the terminals can be connected to one of a number of computers. Minicomputers may be located at a remote site to handle local processing and to maintain local files with summary data transactions transmitted to a central location.
In contrast, a batch system could be said to be program driven because a specific program must be loaded into the computer to process all transactions that fit that program and its related files. In a transaction-driven system, the transaction code part of the message becomes the most sensitive part because it initiates all subsequent actions.
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