You could use heterogeneous services so that a non-Oracle system (DB2) appears as a single, local, Oracle database; the local Oracle server hides the distribution and heterogeneity of the data. The Oracle server accesses the non-Oracle system using Oracle8i Heterogeneous Services and a system-specific transparent gateway. Therefore, if you include a DB2 database in an Oracle distributed system, you need to obtain a DB2-specific transparent gateway so that the Oracle databases in the system can communicate with it.
The transparent gateway agent facilitates communication between Oracle and non-Oracle databases and uses the Heterogeneous Services component in the Oracle server. The agent executes SQL, procedural, and transactional requests at the non-Oracle system on behalf of the Oracle server.
See the following Oracle docs for detailed information (all docs can be found at http://technet.oracle.com):
- Oracle8i Concepts
- Oracle8i Distributed Database Systems
- Oracle Open Gateway Installation and User's Guide
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This was first published in December 2002