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Re:The GitHub Availability Report by user5994461 on Thursday July 16, 2020 @07:16AM (#23857759)
>>> It's still unclear to me whether this particular failure mode is common enough

It is very common. Had the same thing happen in my company last year, on multiple systems! The organization was reaching a decade old, nobody thought of that when the table were initially created.

Re:The GitHub Availability Report by ithkuil on Thursday July 16, 2020 @08:32AM (#23858307)
Yeah I now realize it's not necessarily 4billion rows actively used, but just 4billion unique keys being allocated