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Oracle would survive only if your client was looking for purely OLTP based systems. If it's for a DW platform, the obvious choice is an MPP based RDBMS system, of which Teradata is THE leader.I am not sure what kind of "Evaluation" was performed... load times ? complex queries ? User concurrence ? ... was scalability accounted for ?Was there a bench marking done on both the systems ? (This is something normally the sales teams could be asked to do)