SQLSTATE[HY000] [1040] Too many connections

#0 /var/www/html/includes/src/__default.php(55416): Zend_Db_Adapter_Pdo_Abstract->_connect()
#1 /var/www/html/includes/src/__default.php(55896): Zend_Db_Adapter_Pdo_Mysql->_connect()
#2 /var/www/html/includes/src/__default.php(54100): Varien_Db_Adapter_Pdo_Mysql->_connect()
#3 /var/www/html/includes/src/__default.php(55159): Zend_Db_Adapter_Abstract->query('SET NAMES utf8', Array)
#4 /var/www/html/includes/src/__default.php(56004): Zend_Db_Adapter_Pdo_Abstract->query('SET NAMES utf8', Array)
#5 /var/www/html/includes/src/__default.php(30197): Varien_Db_Adapter_Pdo_Mysql->query('SET NAMES utf8')
#6 /var/www/html/includes/src/__default.php(30138): Mage_Core_Model_Resource->_newConnection('pdo_mysql', Object(Mage_Core_Model_Config_Element))
#7 /var/www/html/includes/src/Mage_Core_Model_Resource_Setup.php(141): Mage_Core_Model_Resource->getConnection('core_setup')
#8 /var/www/html/includes/src/Mage_Core_Model_Resource_Setup.php(234): Mage_Core_Model_Resource_Setup->__construct('core_setup')
#9 /var/www/html/includes/src/__default.php(20895): Mage_Core_Model_Resource_Setup::applyAllUpdates()
#10 /var/www/html/includes/src/__default.php(20820): Mage_Core_Model_App->_initModules()
#11 /var/www/html/app/Mage.php(689): Mage_Core_Model_App->run(Array)
#12 /var/www/html/index.php(116): Mage::run('', 'store')
#13 {main}