>Let's see: pessimistically assume every person in the US (275 X 10^6)
>has 10 Citibank cards and uses them 10 times a day; that's 27.5 billion
>transactions a day. Figure each transaction requires storing 1K byte,
>that means a year's worth of data takes up only about 10 Tbytes of storage.
based on your figures, a system that's 99.99999% accurate would still make
more than a quarter million mistakes each day (1 per 100,000 transactions).
increasing the reliability exponentially increases the costs exponentially
as well.
assuming they want something with 9-10 significant digits of reliability,
the testing alone will be expensive.. if you want to find one-in-a-billion
errors, you have to run and verify several billion test cases.
mike stone <[EMAIL PROTECTED]> 'net geek..
been there, done that, have network, will travel.
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