TP Monitor A program that controls data transfer between clients and servers in
order to provide a consistent environment, particularly for online transaction
processing (OLTP).
Complex applications are often built on top of several resource managers (such as DBMSs,
operating systems, user interfaces, and messaging software). A Transaction Processing
Monitor, or TP Monitor, is a middleware component that provides access to the services
of a number of resource managers and provides a uniform interface for programmers who
are developing transactional software. A TP Monitor forms the middle tier of a three-tier
architecture, as illustrated in Figure 2.16. TP Monitors provide significant advantages,
including:
• Transaction routing The TP Monitor can increase scalability by directing transactions
to specific DBMSs.
• Managing distributed transactions The TP Monitor can manage transactions that
require access to data held in multiple, possibly heterogeneous, DBMSs. For example,
a transaction may require to update data items held in an Oracle DBMS at site 1, an
Informix DBMS at site 2, and an IMS DBMS as site 3. TP Monitors normally control
transactions using the X/Open Distributed Transaction Processing (DTP) standard. A
TP Monitor A program that controls data transfer between clients and servers in
order to provide a consistent environment, particularly for online transaction
processing (OLTP).
Complex applications are often built on top of several resource managers (such as DBMSs,
operating systems, user interfaces, and messaging software). A Transaction Processing
Monitor, or TP Monitor, is a middleware component that provides access to the services
of a number of resource managers and provides a uniform interface for programmers who
are developing transactional software. A TP Monitor forms the middle tier of a three-tier
architecture, as illustrated in Figure 2.16. TP Monitors provide significant advantages,
including:
• Transaction routing The TP Monitor can increase scalability by directing transactions
to specific DBMSs.
• Managing distributed transactions The TP Monitor can manage transactions that
require access to data held in multiple, possibly heterogeneous, DBMSs. For example,
a transaction may require to update data items held in an Oracle DBMS at site 1, an
Informix DBMS at site 2, and an IMS DBMS as site 3. TP Monitors normally control
transactions using the X/Open Distributed Transaction Processing (DTP) standard. A
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