PDOException: SQLSTATE[HY000] [1040] Too many connections in /home/test2/www/vendor/magento/zendframework1/library/Zend/Db/Adapter/Pdo/Abstract.php:128
Stack trace:
#0 /home/test2/www/vendor/magento/zendframework1/library/Zend/Db/Adapter/Pdo/Abstract.php(128): PDO->__construct()
#1 /home/test2/www/vendor/magento/zendframework1/library/Zend/Db/Adapter/Pdo/Mysql.php(111): Zend_Db_Adapter_Pdo_Abstract->_connect()
#2 /home/test2/www/vendor/magento/framework/DB/Adapter/Pdo/Mysql.php(424): Zend_Db_Adapter_Pdo_Mysql->_connect()
#3 /home/test2/www/vendor/magento/zendframework1/library/Zend/Db/Adapter/Abstract.php(460): Magento\Framework\DB\Adapter\Pdo\Mysql->_connect()
#4 /home/test2/www/vendor/magento/zendframework1/library/Zend/Db/Adapter/Pdo/Abstract.php(238): Zend_Db_Adapter_Abstract->query()
#5 /home/test2/www/vendor/magento/framework/DB/Adapter/Pdo/Mysql.php(560): Zend_Db_Adapter_Pdo_Abstract->query()
#6 /home/test2/www/vendor/magento/framework/DB/Adapter/Pdo/Mysql.php(627): Magento\Framework\DB\Adapter\Pdo\Mysql->_query()
#7 /home/test2/www/generated/code/Magento/Framework/DB/Adapter/Pdo/Mysql/Interceptor.php(95): Magento\Framework\DB\Adapter\Pdo\Mysql->query()
#8 /home/test2/www/vendor/magento/framework/Lock/Backend/Database.php(84): Magento\Framework\DB\Adapter\Pdo\Mysql\Interceptor->query()
#9 /home/test2/www/vendor/magento/framework/Cache/LockGuardedCacheLoader.php(134): Magento\Framework\Lock\Backend\Database->lock()
#10 /home/test2/www/vendor/magento/module-config/App/Config/Type/System.php(281): Magento\Framework\Cache\LockGuardedCacheLoader->lockedLoadData()
#11 /home/test2/www/vendor/magento/module-config/App/Config/Type/System.php(207): Magento\Config\App\Config\Type\System->loadDefaultScopeData()
#12 /home/test2/www/vendor/magento/module-config/App/Config/Type/System.php(181): Magento\Config\App\Config\Type\System->getWithParts()
#13 /home/test2/www/vendor/magento/framework/App/Config.php(132): Magento\Config\App\Config\Type\System->get()
#14 /home/test2/www/vendor/magento/framework/App/Config.php(80): Magento\Framework\App\Config->get()
#15 /home/test2/www/vendor/magento/framework/App/Config.php(93): Magento\Framework\App\Config->getValue()
#16 /home/test2/www/vendor/magento/module-store/Model/HeaderProvider/Hsts.php(50): Magento\Framework\App\Config->isSetFlag()
#17 /home/test2/www/vendor/magento/framework/App/Response/HeaderManager.php(42): Magento\Store\Model\HeaderProvider\Hsts->canApply()
#18 /home/test2/www/vendor/magento/framework/Interception/Interceptor.php(121): Magento\Framework\App\Response\HeaderManager->beforeSendResponse()
#19 /home/test2/www/vendor/magento/framework/Interception/Interceptor.php(153): Magento\Framework\App\Response\Http\Interceptor->Magento\Framework\Interception\{closure}()
#20 /home/test2/www/generated/code/Magento/Framework/App/Response/Http/Interceptor.php(23): Magento\Framework\App\Response\Http\Interceptor->___callPlugins()
#21 /home/test2/www/vendor/magento/framework/App/ExceptionHandler.php(103): Magento\Framework\App\Response\Http\Interceptor->sendResponse()
#22 /home/test2/www/vendor/magento/framework/App/ExceptionHandler.php(70): Magento\Framework\App\ExceptionHandler->handleDeveloperMode()
#23 /home/test2/www/vendor/magento/framework/App/Http.php(156): Magento\Framework\App\ExceptionHandler->handle()
#24 /home/test2/www/vendor/magento/framework/App/Bootstrap.php(269): Magento\Framework\App\Http->catchException()
#25 /home/test2/www/pub/index.php(29): Magento\Framework\App\Bootstrap->run()
#26 {main}

Next Zend_Db_Adapter_Exception: SQLSTATE[HY000] [1040] Too many connections in /home/test2/www/vendor/magento/zendframework1/library/Zend/Db/Adapter/Pdo/Abstract.php:144
Stack trace:
#0 /home/test2/www/vendor/magento/zendframework1/library/Zend/Db/Adapter/Pdo/Mysql.php(111): Zend_Db_Adapter_Pdo_Abstract->_connect()
#1 /home/test2/www/vendor/magento/framework/DB/Adapter/Pdo/Mysql.php(424): Zend_Db_Adapter_Pdo_Mysql->_connect()
#2 /home/test2/www/vendor/magento/zendframework1/library/Zend/Db/Adapter/Abstract.php(460): Magento\Framework\DB\Adapter\Pdo\Mysql->_connect()
#3 /home/test2/www/vendor/magento/zendframework1/library/Zend/Db/Adapter/Pdo/Abstract.php(238): Zend_Db_Adapter_Abstract->query()
#4 /home/test2/www/vendor/magento/framework/DB/Adapter/Pdo/Mysql.php(560): Zend_Db_Adapter_Pdo_Abstract->query()
#5 /home/test2/www/vendor/magento/framework/DB/Adapter/Pdo/Mysql.php(627): Magento\Framework\DB\Adapter\Pdo\Mysql->_query()
#6 /home/test2/www/generated/code/Magento/Framework/DB/Adapter/Pdo/Mysql/Interceptor.php(95): Magento\Framework\DB\Adapter\Pdo\Mysql->query()
#7 /home/test2/www/vendor/magento/framework/Lock/Backend/Database.php(84): Magento\Framework\DB\Adapter\Pdo\Mysql\Interceptor->query()
#8 /home/test2/www/vendor/magento/framework/Cache/LockGuardedCacheLoader.php(134): Magento\Framework\Lock\Backend\Database->lock()
#9 /home/test2/www/vendor/magento/module-config/App/Config/Type/System.php(281): Magento\Framework\Cache\LockGuardedCacheLoader->lockedLoadData()
#10 /home/test2/www/vendor/magento/module-config/App/Config/Type/System.php(207): Magento\Config\App\Config\Type\System->loadDefaultScopeData()
#11 /home/test2/www/vendor/magento/module-config/App/Config/Type/System.php(181): Magento\Config\App\Config\Type\System->getWithParts()
#12 /home/test2/www/vendor/magento/framework/App/Config.php(132): Magento\Config\App\Config\Type\System->get()
#13 /home/test2/www/vendor/magento/framework/App/Config.php(80): Magento\Framework\App\Config->get()
#14 /home/test2/www/vendor/magento/framework/App/Config.php(93): Magento\Framework\App\Config->getValue()
#15 /home/test2/www/vendor/magento/module-store/Model/HeaderProvider/Hsts.php(50): Magento\Framework\App\Config->isSetFlag()
#16 /home/test2/www/vendor/magento/framework/App/Response/HeaderManager.php(42): Magento\Store\Model\HeaderProvider\Hsts->canApply()
#17 /home/test2/www/vendor/magento/framework/Interception/Interceptor.php(121): Magento\Framework\App\Response\HeaderManager->beforeSendResponse()
#18 /home/test2/www/vendor/magento/framework/Interception/Interceptor.php(153): Magento\Framework\App\Response\Http\Interceptor->Magento\Framework\Interception\{closure}()
#19 /home/test2/www/generated/code/Magento/Framework/App/Response/Http/Interceptor.php(23): Magento\Framework\App\Response\Http\Interceptor->___callPlugins()
#20 /home/test2/www/vendor/magento/framework/App/ExceptionHandler.php(103): Magento\Framework\App\Response\Http\Interceptor->sendResponse()
#21 /home/test2/www/vendor/magento/framework/App/ExceptionHandler.php(70): Magento\Framework\App\ExceptionHandler->handleDeveloperMode()
#22 /home/test2/www/vendor/magento/framework/App/Http.php(156): Magento\Framework\App\ExceptionHandler->handle()
#23 /home/test2/www/vendor/magento/framework/App/Bootstrap.php(269): Magento\Framework\App\Http->catchException()
#24 /home/test2/www/pub/index.php(29): Magento\Framework\App\Bootstrap->run()
#25 {main}