title: Flask SQLAlchemy DB connections with MYSQL
body: <p>I am using falsk SQLAlchemy with MYSQL with all default configuration(pool size and timeout)</p>
  
  <p>I don't understand why do I get out of DB connections from the MYSQL DB?
  My server is not that heavy loaded.</p>
  
  <p>Can someone please explain how the flask sql alchemy get and release DB connections?</p>
  
  <p>If I have a pool thread of 20 on my apache mod_wsgi server that means by theory that i can have 20 db connection opens all the time and that's it no?</p>
  
  <p>How flask sql alchemy handle close and restore those connections.
  Thanks</p>