Transaction Processing Monitors
In 1991, the X/Open standards group defined an open systems standard interface
through which transaction processing (TP) monitors could communicate with XAcompliant
resource managers, such as the Oracle RDBMS and other XA-compliant
databases. Several popular TP monitors that support XA are in production, including
BEA Tuxedo and IBM??™s CICS and Encina.
Oracle added an Oracle Manager for Microsoft Transaction Server (MTS) to
Oracle8i for Windows NT. Since that time, Microsoft has superseded its COM architecture
with the .NET architecture. Release 2 of Oracle9i added .NET support
enabling .NET transactional applications to use Oracle as a resource manager.
We have mentioned TP monitors in previous chapters in connection with their role
in online transaction processing. Among their other duties, TP monitors assure that
transactions between multiple applications and resources complete properly. As
noted previously, Oracle provides its own two-phase commit protocol for distributed
transactions, a capability once available only with a TP monitor.
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