Reloading mod_perl modules automatically when they change

Beware of using Apache::StatINC or Apache::Reload, especially is the module in question is a module acting as a configuration file. A severe shortage of fun can occur.

MySQL stored procedure gotchas

END and END IF statements must always end with a semicolon.

Debugging Perl DBI

You can set the tracelevel from 1-9 to see diagnostic messages in the logs!

Putting MySQL to sleep

Use

select sleep(30);

You can call this from a script and then run

show full processlist;

on the server to verify that the script is hitting it.