Also I asked this question... and don't forget that now we have available the SQL Server 2008! ...vs Oracle 11g!

As I search in the Internet both technologies are very nice and strong to handle toooo many data!

one example is for the database with large data such as 300 TB database just for test the Oracle was more successful than SQL Server 2005!

So, on the other hand the Japan database engineers and architects has set up the Clustering with SQL Server 2005 for transfer 2 000 000 (million) data per second ( this is very big performance)!

Little bit abstract info here but these info coming from all the people who works with Oracle and SQL Server!

Definitively, I cannot find the answer yet which is the best!!!