Out 05 2008
Speed Up MySQL: Replace or On Duplicate Key Update?
It comes to a time when you need to optimize your code to the maximum. Usually most people do not worry to much about code performance or speed, this is a big mistake.
However, when you have your own server and less performance means more memory usage, you will get to the point the hard way. Most of the time, more memory usage means more hardware failure and server slow downs and down times.
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