I don't think it's common per-se, but it leads into the next point as well. Beca...

morgo on May 30, 2017 | parent | context | favorite | on: MySQL 8.0: Retiring Support for the Query Cache

I don't think it's common per-se, but it leads into the next point as well. Because of MVCC, what you are supposed to see (while returning non-stale results) gets complicated.