How to generate 20 billion transactions for a POC

Hi,
I have a requirement to generate 20 billion transactions for a data warehouse proof of concept.
There are a number of rules which will be required to be implemented to make analysis of the transactions seem realistic. Such as certain products are more popular at certain times of year, 20% of customers buy 80% of products sold, etc.
I could write a PL/SQL procedure to do this, but I think it might get quite complicated, and I'm sure there must be tools out there to assist in generating this sort of volume of test data with these sorts of rules.
Does Oracle or any 3rd party offer such a tool?
Thanks
Milo Davies

I'm sure with a bit of creative thinking you could generate this from the data dictionary depending on the number of rows in all_objects you could cartesian to itself to generate billions of records.
Use Mod, Power, Dbms_Random to get the profile you require within the data.
See:
http://asktom.oracle.com/pls/ask/f?p=4950:8:1063709913777420230::NO::F4950_P8_DISPLAYID,F4950_P8_CRITERIA:2151576678914,
For some details.

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