Can I execute an external process via MySQL on table change? When using triggers, if an update is done to a table then a trigger is executed. This is very convenient. But, what I would need is to execute an external script.
Is it possible to configure MySQL so that on a trigger/change of a value in a table an external process/script is executed?
It is possible, and it also makes for a security threat. 

Anyway, to make that happen you would need to create (program, compile and install plugin) you own UDF - User Defined Function. It's a C/C++ code, so you can do anything you like in there.