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"This is the first time, that we know of, that someone has put a one petabyte-plus database into production," said Waqar Hasan, VP of data at Yahoo. "We have built it to scale to tens of petabytes and we intend to get there. Come 2009, we'll be at multiple tens of petabytes."
A petabyte equals one thousand terabytes, one million gigabytes, or 1 trillion megabytes.
Yahoo Claiming a Record With Its Petabyte SQL Database [informationweek.com]