MySQL和CodeIgniter 3：连接错误过多

Question

So I have a little problem here, I'm using CodeIgniter 3. Sometimes when I try to access my website. It comes to an error too many connection.

This is my database.php

$active_group = 'default';
$query_builder = TRUE;

$db['default'] = array(
    'dsn'   => '',
    'hostname' => 'localhost',
    'username' => 'root',
    'password' => '',
    'database' => 'testing',
    'dbdriver' => 'mysqli',
    'dbprefix' => '',
    'pconnect' => FALSE,
    'db_debug' => TRUE,
    'cache_on' => FALSE,
    'cachedir' => '',
    'char_set' => 'utf8',
    'dbcollat' => 'utf8_general_ci',
    'swap_pre' => '',
    'encrypt' => FALSE,
    'compress' => FALSE,
    'stricton' => FALSE,
    'failover' => array(),
    'save_queries' => TRUE
);

Any correct code to solve this problem ?

Thanks for any help :)

Answer 1

Off the mysql.allow_persistent because if it is on. Then it create connections again and again

//Set mysql.allow_persistent ON to Off
mysql.allow_persistent = Off

Note : If Persistent connections is on, that do not close when the execution of your script ends

Also Read Too many connections

Answer 2

I was recently stumped by the fact that one of my controllers was maxing out connections to the database. Adding in some debug logging revealed that it was creating a new connection for every single query, and holding them open, so they were rapidly exhausted. None of my other controllers did this, they all used a single connection per request.

After much head-scratching, what eventually solved it was adding $this->load->library('session'); to the controller's constructor, after $this->load->database(); . All my other controllers had that, but this particular controller didn't do any session-related stuff so I hadn't bothered with it. But for some reason it seems to be necessary to load it in order to use a single database connection for the lifetime of the request.

This was in CodeIgniter 2.x, but much of the 3.x code is the same, so it might apply there too.