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From: Lie Ryan <lie.1296@gmail.com>
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Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:18751

On 01/10/2012 12:05 PM, Roy Smith wrote:
> Somewhat more seriously, let's say you wanted to do test queries against
> a database with 100 million records in it.  You could rebuild the
> database from scratch for each test, but doing so might take hours per
> test.  Sometimes, real life is just*so*  inconvenient.

All serious database has rollback feature when they're available to 
quickly revert database state in the setUp/cleanUp phase.