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Is Oracle Transparent Gateway (HS) a free tool? I am in search as well for a tool to migrate 500 gigabytes of data from Oracle/AIX to DB2/OS390.
Heterogeneous Services (HS) does come with the Oracle database. You get this product when you pay for the database software. With HS, you can create a database link to your DB2 database and either pull or push data across the database link.