"The Migration Workbench is a tool that simplifies the process of migrating data and applications from an Microsoft SQL Server and Sybase Adaptive Server environment to an Oracle9i or Oracle8i destination database. The Migration Workbench allows you to quickly and easily migrate an entire application system, that is the database schema including triggers and stored procedures, in an integrated, visual environment."
I have not personally used the Migration Workbench so you may want to ask others who have. You can find the reference documentation for this utility on Oracle's Technology Network Web site.
Dig Deeper on Oracle database export, import and migration
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