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4. Fundamental mechanisms of a transactional environment
4.1 General structure of a transaction monitor
A transactional monitor has a number of tasks to perform, some of which are in close cooperation with the underlying operating system. Among the most important are :
scheduling of work to be carried out on the various servers: the techniques used must, among other things, allow a high degree of flexibility so as to multiply the available resources as much as possible and thus increase system throughput;
management of different server classes and overall system load control (process server, memory server, queue server, etc.);
authentication and access rights management services, which are implemented each time a connection...
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Fundamental mechanisms of a transactional environment
Transactional programming 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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