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MyISAM days are gone, no one will seriously consider it as suitable engine in MySQL.

It is quite likely unless you've meticulously avoided it that MySQL is using ISAM on-disk temp tables in the service of your queries.

And on 8 MyISAM is mostly gone, not even the 'mysql' schema uses it.

Edit: Originally linked only to default_tmp_storage_engine).

I didn't know that, thanks!