The components can then attempt to perform distributed updates, using data manipulation language, on another database using pre-existing database links between these databases.While the distributed updates from shared servers succeed, those from dedicated servers fail.
The Oracle MTS Recovery Service also generates trace file output in the ORACLEBASE ORACLEHOME oramts trace directory. If changes are made to the net service name, and pooled connections are available, the application using the connection pool must be stopped and restarted. These changes can include altering the host or the database system identifier (SID) for the net service name in the tnsnames.ora file. This includes any application hosting Microsoft Transaction Server components. In a dedicated server configuration, one client corresponds to one Oracle server process. In a shared server configuration, a single Oracle server process can be shared by more than one client connection. In a dedicated server configuration, you cannot use distributed updates ( data manipulation language statements across database links) from other databases. However, if the original connection to the database is established using shared server configurations, the distributed updates from other databases succeed. Oracle Net connection pooling enables you to minimize the number of physical network connections to a shared server. This is achieved by sharing a dispatchers set of connections among multiple client processes. The OCI connection pooling layer also caches Oracle Net connections to reduce clientserver session setup time. During phase one, the transaction manager (TM) requests the various resource managers involved in the TMs transaction to prepare the underlying distributed transactions. In phase two, the TM determines whether it commits or terminates the transaction, and requests the resource managers to commit or terminate the underlying transaction. If a resource manager fails to receive the phase two notification, the underlying distributed transaction becomes in-doubt. Distributed transactions correspond to transactions coordinated by the MS DTC. A distributed transaction can become in-doubt when the transaction cannot commit or terminate (phase two of the two-phase commit). See Chapter 3, Managing Recovery Scenarios for information on creating the Microsoft Transaction Server administrative user account for the new database.
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