MySQL monitoring is one ... The above slow query is just a test one that I specially crafted to be slow, so there’s not much to optimize in it, but real-world slow production queries should ...

The simplest optimization in MySQL is to choose ... Specially when your query involves subqueries, MySQL will perform an additional search for rows that contain NULL. This search can be avoided ...

For years, MySQL has been the dominant open-source ... improvements that our workload doesn't really hit (better query optimization and index usage during joins, much better sub query support ...