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Is there a way to generate a list of JOINS being performed without indexes in MySQL?

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1 Answer 1

up vote 3 down vote accepted

If you have available a list of SELECT queries your application performs, just put log-queries-not-using-indexes in your my.cnf, restart MySQL and execute all the SELECTs. Then read the log file.

Alternatively you can run EXPLAIN SELECT your_query_using_JOIN and read the output.

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