title: I set CONN_MAX_AGE as 60 in my django app, but the database link still exist after 60 seconds, why?
body: <p>I set CONN_MAX_AGE as 60 in my django app, but the database link  still exist after 60 seconds, why?
  here is the setting:</p>
  
  <pre><code>   DATABASES = {
        'default': {
             'ENGINE': 'django.db.backends.mysql', # Add 'postgresql_psycopg2', 'mysql', 'sqlite3' or 'oracle'.
             'NAME': 'craw',                      # Or path to database file if using sqlite3.
             'USER': 'root',                      # Not used with sqlite3.
             'PASSWORD': 'root',                  # Not used with sqlite3.
             'HOST': '127.0.0.1',                      # Set to empty string for localhost. Not used with sqlite3.
              'PORT': '3306',                      # Set to empty string for default. Not used with sqlite3.
              'CONN_MAX_AGE':60
              }
     }
  </code></pre>
  
  <p>here is the mysql connections:
  <img src="https://i.stack.imgur.com/lQbNO.png" alt="enter image description here"></p>