The technology you'll want to leverage in Oracle is called Transparent Gateways (previously called Heterogenous Services). With Transparent Gateways, you can set up a database link from an Oracle database to a non-Oracle database, like DB2. Then you can create a trigger in your Oracle database that gets fired when a table is changed. The data changes can be sent to your DB2 database through this Transparent Gateway.
The Oracle documentation lists information on Transparent Gateways.
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