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Oracle is another very popular database system, and it has a record of 100TB of data in 385 billion records. And that's not even the largest database in that survey (330TB for size, nearly 3 trillion rows, in different databases).
There is a good article at eWeek about Wal-Mart's data warehouse, which is reported to be over 500 terabytes by the article... in 1994. The vendor is NCR (my employer) and the database is Teradata. If the database is architected well enough, it can grow very large without many performance problems. Of course you have to have the right hardware setup to go with it, though.
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