There are three that I'm aware of and have used in production environments:
- Bulk unload the data from Oracle to files, copy the files to the SQL Server, use BCP or DTS to load the data into SQL Server.
- Create a DTS package that moves the data from Oracle to SQL Server.
- Buy Data Mirror, and set it up to move incremental data from Oracle to SQL Server.
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This was first published in September 2003