我正在尝试测试似乎被忽略的wait_timeout MySQL设置.
PHP脚本:
<?PHP
function microtime_float()
{
list($usec, $sec) = explode(" ", microtime());
return ((float)$usec + (float)$sec);
}
$sql = MysqLi_connect('localhost','root','root','MysqL');
$query = "SHOW VARIABLES WHERE Variable_name='wait_timeout';";
$result = $sql->query($query) or die($query.'<br />'.$sql->error);
$row = $result->fetch_object();
echo "wait_timeout = " . $row->Value . "<br/>\n";
$time_start = microtime_float();
$query = "SELECT SLEEP(2) FROM MysqL.user;";
$sql->query($query) or die($query.'<br />'.$sql->error);
$time_end = microtime_float();
$time = $time_end - $time_start;
echo "Query completed in $time seconds<br/>\n";
echo "You got the page";
脚本输出:
wait_timeout = 2
Query completed in 8.0005459785461 seconds
You got the page
我的配置
mariadb-server-5.3.5
PHP5.3.6
解决方法:
wait_timeout和interactive_timeout都是连接断开之前不活动的时间.因此,连接必须处于空闲状态(不运行查询)才能被删除. MysqL SLEEP()不计算,因为您正在运行查询.
您将不得不手动终止长时间运行的查询(没有设置让MysqL为您执行此操作).你可以编写脚本.使用SHOW PROCESSLIST(或外部工具,如Innotop)和KILL.