Why are my processes in MySQL disappearing for some reason?

When I do:

show processlist

I see开发者_运维百科 all my 20 servers connected to it. But, after a while, they drop off one by one. I know it's not the script problem. My script does Not terminate.

Could it be that it time-out if it doesn't make a query within a certain time? How do I change that setting?

Edit: The python script selects and inserts into the database every 1-3 minutes.

Unless you have a daemon (background) process running which maintains a connection pool, your connections will close after your script terminates.