[iv42]

Also, it's basically identical to the pattern described as Counter Tables in "High Performance MySQL" (3rd edition), published in 2012.

[tantalor]

Indeed, it also calls them "slots":

> You can get higher concurrency by keeping more than one row and updating a random row... just choose a random slot and update it

https://www.oreilly.com/library/view/high-performance-mysql/...