Extend phpMyAdmin time out

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1)Go find phpmyadmin's config.inc.php

$ sudo gedit /etc/phpmyadmin/config.inc.php

2)Add these lines to the bottom of the file

$cfg['LoginCookieValidity'] = 60*60*24;
ini_set('session.gc_maxlifetime', $cfg['LoginCookieValidity']); 

3)Restart Apache

$ sudo service apache2 restart

If with above trick, still doesn't work, try to edit /etc/phpmyadmin/config.inc.php file, then search for

$cfg['Servers'][$i]['auth_type'] = 'cookie'

then edit / add the following

$cfg['Servers'][$i]['auth_type'] = 'config';
$cfg['Servers'][$i]['user'] = 'your_mysql_username';
$cfg['Servers'][$i]['password'] = 'your_mysql_password';