If you ever need for a simple, light weight and absolutely free data migration tool then you should try Data Puppy Lite. It offers the ability to migrate a schema at a time from a source to target database, and it supports the following databases: Oracle, MySQL, SQL Server and PostgreSQL. Data Puppy Lite automatically handles all the required, complex data type conversions as you got from one database to another. As a Windows client tool it's not well suited for moving very large amounts of data. But when all you really need is something quick and easy it fits the bill.