February 11, 2012

Is there a performance difference between JOIN and WHERE?

I’ve heard this question a lot, but never thought to blog about the answer. “Is there a performance difference between putting the JOIN conditions in the ON clause or the WHERE clause in MySQL?” No, there’s no difference. The following queries are algebraically equivalent inside MySQL and will have the same execution plan. SELECT * [...]

Slides from my Sphinx talk at RIT++ 2010

While the majority of Percona gang travelled to California for the MySQL event of the year, I headed in the opposite direction to Moscow for RIT++ 2010 conference where I presented a talk on Sphinx. You can get the PDF file here – Improving MySQL-based applications performance with Sphinx.     I have been invited [...]