"Jim C. Nasby" <jnasby@pervasive.com> writes:
> True random data wouldn't be such a great test either; what would
> probably be best is a set of random words, since in real life you're
> unlikely to have truely random data.
True random data would provide worst-case compression behavior, so
we'd want to try that to find out what the downside is; but we shouldn't
consider it to be the design center.
regards, tom lane