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1. A few essential architectural concepts
1.1 Data integrity
Secure access to company data is a fundamental property of a transactional programming environment.
Data is potentially shared between all users, making it necessary to manage data access procedures rigorously. Otherwise, access conflicts are inevitable, and data integrity can no longer be guaranteed. What's more, in the event of a dispute, or when restoring the database to a previous state, it is essential to manage the chronology of database operations.
This property is guaranteed by the implementation of two mechanisms that play a crucial role in any transactional programming environment:
Lock Manager ;
the Log Manager.
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A few essential architectural concepts
Traditional transactional
Bibliography
Product range
Transactional manufacturers
Most computer manufacturers offer transactional systems (for complete and up-to-date information, please refer to the individual product descriptions).
IBM offers several transactional environments. The oldest is IMS (Information Management System). This is the reference transactional environment for very large IBM systems.
The more recent...
Standardization
The de facto standard for cooperative transaction protocols is IBM's APPC (Advanced Program to Program Communication) protocol.
OSI has standardized a cooperative transaction protocol equivalent to APPC under the name OSI/TP, which is built on the OSI session, whereas APPC is built on IBM's SNA session. Applications using APPC are portable to OSI/TP.
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