I will quickly admit I am guilty of using default values for MySQL variables. Luckily, none of our MySQL installations are “mission critical”.
I wrote a recent post about the MySQL Error 1206 I encountered. Could possibly have avoided this problem with the information I found in the MySQL Performance Blog. For example, by increasing the innodb_buffer_pool_size value it not only resolved the 1206 error, it also improved query performance. Chalk it up as another lesson learned.