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MySQL my.cnf Variables

tmp table
slow_query_logs - Page not found.

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Tmp Table

Mysql will sometimes create internal temporary tables while processing statements.
Users have no direct control over when this occurs

https://dev.mysql.com/doc/refman/5.7/en/internal-temporary-tables.html
http://stackoverflow.com/questions/7532307/skip-copying-to-tmp-table-on-disk-mysql