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max_user_connections limit being hit on SS3 site but only 1-2 simultaneous users at time of error


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vwd

Community Member, 160 Posts

2 October 2012 at 1:38am

Edited: 02/10/2012 1:56am

Hi,

A few [url=http://www.silverstripe.org/general-questions/show/20593]SS2.4 sites were periodically experiencing max_user_connections exceeded error[/url].

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:

show status like '%onn%';

Variable_name Value
Aborted_connects 12352
Connections 6013446
Max_used_connections 53
Ssl_client_connects 0
Ssl_connect_renegotiates 0
Ssl_finished_connects 0
Threads_connected 8

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.