How to debug Lock wait timeout exceeded on MySQL?

Question

In my production error logs I occasionally see:

SQLSTATE[HY000]: General error: 1205 Lock wait timeout exceeded; try restarting transaction

Answer 1

Take a look at the man page of the pt-deadlock-logger utility:

brew install percona-toolkit
pt-deadlock-logger --ask-pass server_name

It extracts information from the engine innodb status mentioned above and also it can be used to create a daemon which runs every 30 seconds.