The answer depends on what you mean by "capacity". The maximum amount of data stored can be 512 petabytes (where 1 petabyte = 1,024 terabytes). In theory, with Oracle 9i's new Real Application Clusters (RAC), you can have virtually unlimited number of simultaneous transactions. Now that is theory and won't be realized in practice. The latest TPC (http://www.tpc.org) benchmarks show that the last Oracle 9i benchmark resulted in 389,434 transactions per minute.
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This was first published in May 2002