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Many-table joins in MySQL 5.6

 | March 6, 2014 |  Posted In: Insight for DBAs, MySQL

I recently worked on an uncommon slow query: less than 100 rows were read and returned, the whole dataset was fitting in memory but the query took several seconds to run. Long story short: the query was a join involving 21 tables, running on MySQL 5.1. But by default MySQL 5.1 is not good at […]

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