Test database to test performance tuning techniques in Oracle

I want to test some performance tuning techniques on a realistic database with many database tables and a lot of data. I would like to do this in Oracle 11g Release 1 and would like to know how best to go about this or if there is a website I could get realistic datasets/database from.

开发者_运维问答Many thanks for your audience.

Cheers, Tunde

Good timing. There was a blog entry today on generating the data for the TPC-H benchmark.

May you can choose something from this.