Jim, I'm already using the solution you mentioned.

The problem is about the performance.
One solution is to increase the performance by using Memcached.

But counting online users always requires a __new__fresh__ COUNT(*) query, even
under Memcahched. Since the COUNT(*) result is very dynamic and could
change every second, it should not be cached.

I'm looking for a faster way to count online users.
COUNT(*) is time consuming under MySQL.

Any light-weight solutions?

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