Facebook gave a MySQL Tech Talk where they talked about many things MySQL, but one of the more subtle and interesting points was their focus on controlling the variance of request response times and not just worrying about maximizing queries per second.
But first the scalability porn. Facebook's OLTP performance numbers were as usual, quite dramatic:
- Query response times: 4ms reads, 5ms writes.
- Rows read per second: 450M peak
- Network bytes per second: 38GB peak
- Queries per second: 13M peak
- Rows changed per second: 3.5M peak
- InnoDB disk ops per second: 5.2M peak
This looks to be a must-see tech talk for anyone on the scaling / infrastructure side of the web.