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Rolling unique user counts
Posted by: Paul Stam
Date: August 09, 2016 02:06AM

Hi!

We collect user data and report on unique visitors. On big periods, these queries take a long time and we have no option in aggregating periods into larger periods.

Rick James suggests to use bitstrings where a userid is being hashed (md5 for instance) and that hash mapped to a single bit inside this bitstring.

How can this mapping be done?

the explanation is also available here: http://mysql.rjweb.org/doc.php/uniques

Any help is greatly appreciated! :)

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