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When it comes to overall performance, it's important to remember that the #1 contributor is always a good database design. The second highest contributor to performance is well-tuned SQL code.

But a better day has come along in MySQL 5.0.37 with the inclusion of the SQL Profiling utility. This interactive diagnostic aid allows a developer or DBA to gain insight into where a set of SQL code spends its time and the resources it is using.