"I spoke at PerconaLive 2011 in New York, giving a talk titled "Breaking Down MySQL/Percona Query Latency With DTrace". My talk was very popular, but it wasn't videoed. Due to interest in the topic, I've made an extended version of the talk. At PerconaLive I got through the talk in 40 minutes, which included skipping through the last few demos. Without needing to race the clock, this extended version goes for 90 minutes -- which may be both a good and a bad thing -- and I did do all the live demos. The extended talk is in five parts. The slides are here: dtrace.org/blogs/brendan/files/2011/06/Percona_DTr… The demos are mostly in parts 4 and 5. You may like to start with them first." Brendan Gregg