EXPERT RESPONSE
Transparent Gateways (formerly Heterogeneous Services -- HS) lets you interact with non-Oracle databases as through a database link. Oracle does not even know that the remote DB is not Oracle.
Transparent Gateways do require a special license. You will have to work with your Oracle salesman to obtain pricing.
For more information on Transparent Gateways, please read the Oracle docs for DB2.
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