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I have a server that is running mysql and it's using a lot of memory. I run: 

mysql > show status like '%onn%'; +--------------------------+-------+ | Variable_name | Value | +--------------------------+-------+ | Aborted_connects | 4 | | Connections | 98609 | | Max_used_connections | 20 | | Ssl_client_connects | 0 | | Ssl_connect_renegotiates | 0 | | Ssl_finished_connects | 0 | | Threads_connected | 1 | +--------------------------+-------+

But then if I run 'show processlist' as the root user I don't see anything. I've tried google for this but It always comes up with stuff related to connection errors. Could someone please just explain why I can't see the connections and how to actually go in and see them?

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    Connections is total number of connections since the server started, not the current number of connections. Commented Nov 3, 2014 at 18:36
  • Well that explains one thing, but it still stands that the server is using huge amounts of RAM with no appearance of anything happening? I have to manually reboot the MySQL server to clear it all our but I don't think that's a very good way of solving the problem. Commented Nov 3, 2014 at 18:45
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    This doesn't help you, but my MySQL does the same thing. stackoverflow.com/questions/1178736/mysql-maximum-memory-usage and serverfault.com/questions/415530/… may or may not also help. Once MySQL requests memory, it never gives it back (many Unix apps are like that), so your max memory usage = your current memory usage. Commented Nov 3, 2014 at 18:57
  • Awesome those links are very informative! Thankyou! Commented Nov 3, 2014 at 19:00
  • MySQL keeps lots of stuff, like database indexes, cached in memory. Commented Nov 4, 2014 at 22:24

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The connection parameter is a bit of a misnomer. It indicates the number of connections that have been made to the server since the server started. The one you might be interested in is Threads connected.

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You have to use ip_conntrack netfilter module, Then you can manipulate maximum connections. You have to change value of net.ipv4.netfilter.ip_conntrack_max via sysctl

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