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3. Distributed transactional
3.1 Resource management
At the macroscopic level, a transactional system has the three main functional components shown in figure 21 .
The traditional transactional system is centralized, i.e. all three components run on the same machine (central or departmental computer) (figure 22 ).
In recent years, there...
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Distributed transactional
Fundamental mechanisms of a transactional environment
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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