Recently I've discovered that I have too many connections in my MySQL database:
mysql> show status like 'Conn%';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| Connections | 39 |
+---------------+-------+
1 row in set (0.00 sec)
mysql> show full processlist;
+----+-------+-----------+--------+---------+------+-------+-----------------------+
| Id | User | Host | db | Command | Time | State | Info |
+----+-------+-----------+--------+---------+------+-------+-----------------------+
| 38 | enrmr | localhost | cakedb | Query | 0 | NULL | show full processlist |
+----+-------+-----------+--------+---------+------+-------+-----------------------+
I've recently installed CakePHP and every time I refresh the main page (F5) the number of connections is incremented in one. Also if I restart again mysql the number of connections al still 39.
My netstat output
netstat -n -a | grep 3306
tcp 0 0 127.0.0.1:3306 0.0.0.0:* ESCUCHAR
I suppose that I have something like 'mysql zombies connections'. How can I kill them? And how I can stop the creations of new connections every time the web page is refreshed? (Can I only have one connection ?) Thanks.
First, Connections
is an incremental counter, it's not current connections. It's total number of connections that were established and/or closed to MySQL instance.
If you want current connections look at Threads_connected
, rather than Connections
.
Secondly, 39 connections is not much, even if it's a total number of connected threads. It all depends on the application, although just one CakePHP instance will probably utilize just one thread.
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