title: How to find root cause for "too many connections" error in MySQL/PHP
body: <p>I'm running a web service which runs algorithms that serve millions of calls daily and run some background processing as well.
  Every now and than I see "Too many connections" error in attempts to connect to the MySQL box" for a few seconds. However this is not necessarily attributed to high traffic times or anything I can put my finger on.</p>
  
  <p>I want to find the bottleneck causing it. Other than in the specific times this happens the server isn't too loaded in terms of CPU and Memory, and has 2-3 connections (threads) open and everything works smoothly. (I use Zabbix for monitoring)</p>
  
  <p>Any creative ideas on how to trace it?</p>