Since Oracle and SQL Server are two completely different products, the only way to move data from one to the other...
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is to use an intermediary step. One of the most vendor-neutral steps is to dump your data from SQL Server to comma-delimited text files, with each file representing one database table. You can then use Oracle's SQL*Loader utility to ingest the contents of these files into Oracle database tables. If you have many tables, this can be a cumbersome solution.
Another intermediary step is to move the data through an ODBC connection. Create an ODBC connection to an Oracle database using Oracle's ODBC drivers. Then have SQL Server's Data Transformation Services (DTS) move the data to the database defined by the ODBC DSN. Alternatively, you can set up Oracle's Heterogeneous Services (HS) to connect the Oracle database to SQL Server through ODBC and then access the SQL Server data through a database link.
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