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  • Key rollover value? Commented Aug 15, 2016 at 20:51
  • An unsigned integer has a max value of 4294967295 before adding 1 will roll it over to 0. Remember if you add a record then delete it, the counter is still increased. Make sure you use unsigned int for the field type otherwise the limit is half of that number. Commented Aug 15, 2016 at 20:53
  • Integer Overflow - en.wikipedia.org/wiki/Integer_overflow Commented Aug 15, 2016 at 20:54
  • 2
    If you add/remove lots of rows the auto increment counter will overflow eventually. Commented Aug 15, 2016 at 20:56
  • 1
    How do people handle rollover? What if there are records with a low ID that never get deleted, but you're starting to near the end where some IDs are at the upper end of 4294967295? Can a "re-indexing" be done? Commented Aug 15, 2016 at 20:57