Hi,

A few SS2.4 sites were periodically experiencing max_user_connections exceeded error.

Now a SS3 site is experiencing similar issues:

• [Error] Couldn't connect to MySQL database | User mysite_user already has more than 'max_user_connections' active connections
  /home/mysite/public_html/framework/model/MySQLDatabase.php:568
  
• [Warning] mysqli::mysqli() [mysqli.mysqli]: (42000/1203): User mysite_user already has more than 'max_user_connections' active connections
  /home/mysite/public_html/framework/model/MySQLDatabase.php:57
  

The account / DB has a max_user_connection limit of 30 and at the time of the error being thrown, the server access logs and analytics data shows only 1 active user, with a few minutes separating the previous request/access to the site. So clearly it isn't an issue with the server being overloaded with traffic or connections.

When I query the database when the site is idle (confirmed via Analytics & Access Logs) here are some relevant results:

What's weird is that there is always a minimum of 8 Threads_connected - is this normal? When I try to simulate traffic (normal site access, site admin, site blog) the highest I see Threads_connected get is around 14.

What typically is the max_user_connections used by other hosts running SilverStripe sites? 30 seems generous!

Any suggestions to investigate further?

Thank you.
VWD.