I've been thinking and experimenting a lot with MySQL 5, and PostgreSQL 8.3, trying to figure out which database server would be most optimal for scaling larger web applications.
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I've brought some of my MySQL optimization tips into a small e-book styled guide, something I hope will help my fellow developers understand what they are getting into before choosing a production environment with MySQL 4, or MySQL 5 in contrast to PostgreSQL.
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If you have any other tips for scaling with MySQL, I'll make sure I add them to my little e-book and release and updated PDF file :)
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<strong><ahref="http://unethicalblogger.com/files/Scaling MySQL.pdf"target="_blank">Scaling MySQL (PDF)</a></strong>