Our Magento version is 18.104.22.168
We have 1 web server on AWS EC2 and 1 RDS for DB. Those server already run almost 1 year. Sometimes we got many DB connections. It about 150 connections during 2 hours and cause our web server can't connect to RDS.
Those connection should not from website because I checked our apache log. In the 2 hours. We got very low apache access log. So I guess those DB connections are come from Magento cron. Now I'm plant to write some log when Magento cron be trigger.
Any idea to trace about those connection?
Look like you need a tool like Aoe_Scheduler & CommerceBug2
Aoe_Scheduler will allow you manage every single cronjob Magento going to execute or already executed.
Commerce Bug might give you more specificed details about your queries.