Hi,
It depends on what you are trying to do with your DW. you can go to.....
and you will see that NCR (Teradata) hold 4 of the top 5 Decision Support largest sites. Now this is for a single Database within a warehouse. Most DW contain multiple databases.
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You can join your 'regional' Teradata users group
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you can go to
and view articles and white papers about teradata and our customers. There even Analyst reports. My favorite although it is almost a year old is.
In Search of Oracle Terabyte Data Warehouses
Teradata has over 200 customers which are beyond the Terabyte. WE have several which are beyond 100 Terabytes. Been there done that.
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If you want to contact them and see how they like Teradata contact your account team. They will put you in touch with other Teradata customers. People you can talk to one on one. Call them and ask them your questions.
Ask your Oracle account team for the phone numbers of other oracle customers that you can call. Then call those people and ask them the same questions.
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Register and come to the NCR Partners users group meeting in Las Vegas Sept 29 - Oct 4. Again talk to real Teradata customers, and developers like myself.