I don't think any of the current Open Source DBs can handle much past 100gig and still query will any performance. MySQL may also be a bad example since it lacks several features to make it a true RDBMS. PostgreSQL would have been a better choice. For anything less than 100gig, Postgresql rocks.
I can't imagine trying to put a 1 TG database on anything but DB2 or Oracle. PostgreSQL is the closest to these on the Open Source side, but it has known issues out past 50gig of data. If we put a cap on the size of the database I would totally agree that there is no reason to use a commerical database.
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I don't think any of the current Open Source DBs can handle much past 100gig and still query will any performance. MySQL may also be a bad example since it lacks several features to make it a true RDBMS. PostgreSQL would have been a better choice. For anything less than 100gig, Postgresql rocks.
I can't imagine trying to put a 1 TG database on anything but DB2 or Oracle. PostgreSQL is the closest to these on the Open Source side, but it has known issues out past 50gig of data. If we put a cap on the size of the database I would totally agree that there is no reason to use a commerical database.