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Troubleshooting MySQL Slow Queries with Tcpdumps

Dec 22, 2010, 18:02 (0 Talkback[s])
(Other stories by Sean Hull)

"MySQL has a wonderful facility for capturing slow queries called the slow query log. However if yours is not enabled when trouble occurs, and restarting the database is not an option, you'll need another solution. This is where a tcpdump can come in handy. It can be used to watch a network interface and display the packets and traffic. What Is A Tcpdump?

"Tcpdump is a Linux command for watching a network interface, and displaying traffic that moves across it.

"On my Mac, the airport network interface (en1) is my main connection to the internet. You may well want to use eth0 there. So, I can do some packet sniffing with tcpdump as follows:"

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