SQLSTATE[HY000] [1040] Too many connections

#0 /var/www/vhosts/kef.com/httpdocs/drupal/includes/database/database.inc(307): PDO->__construct('mysql:host=loca...', 'kefd', 'drupal2014KEFpa...', Array)
#1 /var/www/vhosts/kef.com/httpdocs/drupal/includes/database/mysql/database.inc(51): DatabaseConnection->__construct('mysql:host=loca...', 'kefd', 'drupal2014KEFpa...', Array)
#2 /var/www/vhosts/kef.com/httpdocs/drupal/includes/database/database.inc(1689): DatabaseConnection_mysql->__construct(Array)
#3 /var/www/vhosts/kef.com/httpdocs/drupal/includes/database/database.inc(1479): Database::openConnection('default', 'default')
#4 /var/www/vhosts/kef.com/httpdocs/drupal/includes/database/database.inc(2350): Database::getConnection('default')
#5 /var/www/vhosts/kef.com/httpdocs/drupal/includes/lock.inc(167): db_query('SELECT expire, ...', Array)
#6 /var/www/vhosts/kef.com/httpdocs/drupal/includes/lock.inc(146): lock_may_be_available('variable_init')
#7 /var/www/vhosts/kef.com/httpdocs/drupal/includes/bootstrap.inc(928): lock_acquire('variable_init', 1)
#8 /var/www/vhosts/kef.com/httpdocs/drupal/includes/bootstrap.inc(2498): variable_initialize(Array)
#9 /var/www/vhosts/kef.com/httpdocs/drupal/includes/bootstrap.inc(2260): _drupal_bootstrap_variables()
#10 /var/www/vhosts/kef.com/httpdocs/drupal/includes/bootstrap.inc(2396): drupal_bootstrap(3, false)
#11 /var/www/vhosts/kef.com/httpdocs/drupal/includes/bootstrap.inc(2252): _drupal_bootstrap_page_cache()
#12 /var/www/vhosts/kef.com/httpdocs/drupal/sites/all/modules/domain/domain.bootstrap.inc(108): drupal_bootstrap(2, false)
#13 /var/www/vhosts/kef.com/httpdocs/drupal/sites/all/modules/domain/domain.bootstrap.inc(70): _domain_bootstrap(0)
#14 /var/www/vhosts/kef.com/httpdocs/drupal/sites/all/modules/domain/settings.inc(21): domain_bootstrap()
#15 /var/www/vhosts/kef.com/httpdocs/drupal/sites/default/settings.php(574): include('/var/www/vhosts...')
#16 /var/www/vhosts/kef.com/httpdocs/drupal/includes/bootstrap.inc(733): include_once('/var/www/vhosts...')
#17 /var/www/vhosts/kef.com/httpdocs/drupal/includes/bootstrap.inc(2376): drupal_settings_initialize()
#18 /var/www/vhosts/kef.com/httpdocs/drupal/includes/bootstrap.inc(2248): _drupal_bootstrap_configuration()
#19 /var/www/vhosts/kef.com/httpdocs/drupal_api.php(13): drupal_bootstrap(7)
#20 /var/www/vhosts/kef.com/httpdocs/app/code/local/Cleargo/Drupal/controllers/Cms/IndexController.php(14): include_once('/var/www/vhosts...')
#21 /var/www/vhosts/kef.com/httpdocs/app/code/core/Mage/Core/Controller/Varien/Action.php(418): Cleargo_Drupal_Cms_IndexController->noRouteAction()
#22 /var/www/vhosts/kef.com/httpdocs/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(254): Mage_Core_Controller_Varien_Action->dispatch('noRoute')
#23 /var/www/vhosts/kef.com/httpdocs/app/code/core/Mage/Core/Controller/Varien/Front.php(178): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#24 /var/www/vhosts/kef.com/httpdocs/app/code/core/Mage/Core/Model/App.php(354): Mage_Core_Controller_Varien_Front->dispatch()
#25 /var/www/vhosts/kef.com/httpdocs/app/Mage.php(684): Mage_Core_Model_App->run(Array)
#26 /var/www/vhosts/kef.com/httpdocs/index.php(154): Mage::run('international', 'website')
#27 {main}