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From Philippe <>
Subject Data model for counting uniques online
Date Wed, 09 Nov 2011 23:09:20 GMT
Hello, I'd like to get some ideas on how to model counting uniques with
My use-case is that I have various counters that I increment based on data
received from multiple devices. I'd like to be able to know if at least X
unique devices contributed to a counter value.
I've thought of the idea of building a key per counter and then using
columns whose name would be the device ids but it might grow very very
large and I don't see how to prune it effeciently.
Any ideas ?


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