Where to find free-to-use, complex test databases?

Question

I need a database for testing a data masking solution. Any database would do (Oracle/MSSQL flavor). I just need the schema / db definition. I have tools to generate data records. The magnitude of database I am looking should have 30 odd tables with 30 odd columns in each table - a HUGE database.

Do freely available complex database /schema definitions exist on the internet? If yes, where do I find them?

Answer 1

Not as complex as you want but Chinook DB is a free sample database that supports Oracle among others.

Answer 2

The good ol' NorthWind. Here r the oracle scripts http://jagchat.spaces.live.com/blog/cns!41050F68F010A662!758.entry

Answer 3

There are various iterations of the AdventureWorks schema for SQL 2005/2008 available.