2 exception(s):
Exception #0 (Zend_Db_Adapter_Exception): SQLSTATE[08004] [1040] Too many connections
Exception #1 (PDOException): SQLSTATE[08004] [1040] Too many connections

Exception #0 (Zend_Db_Adapter_Exception): SQLSTATE[08004] [1040] Too many connections
<pre>#1 Zend_Db_Adapter_Pdo_Mysql->_connect() called at [vendor/magento/framework/DB/Adapter/Pdo/Mysql.php:512]
#2 Magento\Framework\DB\Adapter\Pdo\Mysql->_connect() called at [vendor/magento/zend-db/library/Zend/Db/Adapter/Abstract.php:460]
#3 Zend_Db_Adapter_Abstract->query() called at [vendor/magento/zend-db/library/Zend/Db/Adapter/Pdo/Abstract.php:242]
#4 Zend_Db_Adapter_Pdo_Abstract->query() called at [vendor/magento/framework/DB/Adapter/Pdo/Mysql.php:641]
#5 Magento\Framework\DB\Adapter\Pdo\Mysql->Magento\Framework\DB\Adapter\Pdo\{closure}() called at [vendor/magento/framework/DB/Adapter/Pdo/Mysql.php:667]
#6 Magento\Framework\DB\Adapter\Pdo\Mysql->performQuery() called at [vendor/magento/framework/DB/Adapter/Pdo/Mysql.php:641]
#7 Magento\Framework\DB\Adapter\Pdo\Mysql->_query() called at [vendor/magento/framework/DB/Adapter/Pdo/Mysql.php:731]
#8 Magento\Framework\DB\Adapter\Pdo\Mysql->query() called at [vendor/magento/zend-db/library/Zend/Db/Adapter/Abstract.php:737]
#9 Zend_Db_Adapter_Abstract->fetchAll() called at [vendor/magento/module-store/App/Config/Source/RuntimeConfigSource.php:100]
#10 Magento\Store\App\Config\Source\RuntimeConfigSource->getEntities() called at [vendor/magento/module-store/App/Config/Source/RuntimeConfigSource.php:61]
#11 Magento\Store\App\Config\Source\RuntimeConfigSource->get() called at [vendor/magento/framework/App/Config/ConfigSourceAggregated.php:42]
#12 Magento\Framework\App\Config\ConfigSourceAggregated->get() called at [generated/code/Magento/Framework/App/Config/ConfigSourceAggregated/Proxy.php:105]
#13 Magento\Framework\App\Config\ConfigSourceAggregated\Proxy->get() called at [vendor/magento/module-store/App/Config/Type/Scopes.php:63]
#14 Magento\Store\App\Config\Type\Scopes->get() called at [vendor/magento/framework/App/Config.php:121]
#15 Magento\Framework\App\Config->get() called at [vendor/magento/module-store/Model/StoreRepository.php:106]
#16 Magento\Store\Model\StoreRepository->getById() called at [vendor/magento/module-store/Model/StoreRepository.php:127]
#17 Magento\Store\Model\StoreRepository->getActiveStoreById() called at [vendor/magento/module-store/Model/StoreResolver.php:181]
#18 Magento\Store\Model\StoreResolver->getDefaultStoreById() called at [vendor/magento/module-store/Model/StoreResolver.php:126]
#19 Magento\Store\Model\StoreResolver->getCurrentStoreId() called at [generated/code/Magento/Store/Model/StoreResolver/Proxy.php:105]
#20 Magento\Store\Model\StoreResolver\Proxy->getCurrentStoreId() called at [vendor/magento/module-store/Model/StoreManager.php:159]
#21 Magento\Store\Model\StoreManager->getStore() called at [generated/code/Magento/Store/Model/StoreManagerInterface/Proxy.php:129]
#22 Magento\Store\Model\StoreManagerInterface\Proxy->getStore() called at [vendor/magento/module-store/Model/Resolver/Store.php:30]
#23 Magento\Store\Model\Resolver\Store->getScope() called at [vendor/magento/framework/App/Config/ScopeCodeResolver.php:49]
#24 Magento\Framework\App\Config\ScopeCodeResolver->resolve() called at [vendor/magento/framework/App/Config.php:63]
#25 Magento\Framework\App\Config->getValue() called at [vendor/magento/module-backend/App/Area/FrontNameResolver.php:131]
#26 Magento\Backend\App\Area\FrontNameResolver->isHostBackend() called at [vendor/magento/module-backend/App/Area/FrontNameResolver.php:107]
#27 Magento\Backend\App\Area\FrontNameResolver->getFrontName() called at [vendor/magento/framework/App/AreaList.php:75]
#28 Magento\Framework\App\AreaList->getCodeByFrontName() called at [vendor/magento/framework/App/Http.php:111]
#29 Magento\Framework\App\Http->launch() called at [vendor/magento/framework/Interception/Interceptor.php:58]
#30 Magento\Framework\App\Http\Interceptor->___callParent() called at [vendor/magento/framework/Interception/Interceptor.php:138]
#31 Magento\Framework\App\Http\Interceptor->Magento\Framework\Interception\{closure}() called at [vendor/magento/module-application-performance-monitor/Plugin/ApplicationPerformanceMonitor.php:38]
#32 Magento\ApplicationPerformanceMonitor\Plugin\ApplicationPerformanceMonitor->aroundLaunch() called at [vendor/magento/framework/Interception/Interceptor.php:135]
#33 Magento\Framework\App\Http\Interceptor->Magento\Framework\Interception\{closure}() called at [vendor/magento/framework/Interception/Interceptor.php:153]
#34 Magento\Framework\App\Http\Interceptor->___callPlugins() called at [generated/code/Magento/Framework/App/Http/Interceptor.php:23]
#35 Magento\Framework\App\Http\Interceptor->launch() called at [vendor/magento/framework/App/Bootstrap.php:264]
#36 Magento\Framework\App\Bootstrap->run() called at [pub/index.php:30]
</pre>

Exception #1 (PDOException): SQLSTATE[08004] [1040] Too many connections
<pre>#1 Zend_Db_Adapter_Pdo_Abstract->_connect() called at [vendor/magento/zend-db/library/Zend/Db/Adapter/Pdo/Mysql.php:111]
#2 Zend_Db_Adapter_Pdo_Mysql->_connect() called at [vendor/magento/framework/DB/Adapter/Pdo/Mysql.php:512]
#3 Magento\Framework\DB\Adapter\Pdo\Mysql->_connect() called at [vendor/magento/zend-db/library/Zend/Db/Adapter/Abstract.php:460]
#4 Zend_Db_Adapter_Abstract->query() called at [vendor/magento/zend-db/library/Zend/Db/Adapter/Pdo/Abstract.php:242]
#5 Zend_Db_Adapter_Pdo_Abstract->query() called at [vendor/magento/framework/DB/Adapter/Pdo/Mysql.php:641]
#6 Magento\Framework\DB\Adapter\Pdo\Mysql->Magento\Framework\DB\Adapter\Pdo\{closure}() called at [vendor/magento/framework/DB/Adapter/Pdo/Mysql.php:667]
#7 Magento\Framework\DB\Adapter\Pdo\Mysql->performQuery() called at [vendor/magento/framework/DB/Adapter/Pdo/Mysql.php:641]
#8 Magento\Framework\DB\Adapter\Pdo\Mysql->_query() called at [vendor/magento/framework/DB/Adapter/Pdo/Mysql.php:731]
#9 Magento\Framework\DB\Adapter\Pdo\Mysql->query() called at [vendor/magento/zend-db/library/Zend/Db/Adapter/Abstract.php:737]
#10 Zend_Db_Adapter_Abstract->fetchAll() called at [vendor/magento/module-store/App/Config/Source/RuntimeConfigSource.php:100]
#11 Magento\Store\App\Config\Source\RuntimeConfigSource->getEntities() called at [vendor/magento/module-store/App/Config/Source/RuntimeConfigSource.php:61]
#12 Magento\Store\App\Config\Source\RuntimeConfigSource->get() called at [vendor/magento/framework/App/Config/ConfigSourceAggregated.php:42]
#13 Magento\Framework\App\Config\ConfigSourceAggregated->get() called at [generated/code/Magento/Framework/App/Config/ConfigSourceAggregated/Proxy.php:105]
#14 Magento\Framework\App\Config\ConfigSourceAggregated\Proxy->get() called at [vendor/magento/module-store/App/Config/Type/Scopes.php:63]
#15 Magento\Store\App\Config\Type\Scopes->get() called at [vendor/magento/framework/App/Config.php:121]
#16 Magento\Framework\App\Config->get() called at [vendor/magento/module-store/Model/StoreRepository.php:106]
#17 Magento\Store\Model\StoreRepository->getById() called at [vendor/magento/module-store/Model/StoreRepository.php:127]
#18 Magento\Store\Model\StoreRepository->getActiveStoreById() called at [vendor/magento/module-store/Model/StoreResolver.php:181]
#19 Magento\Store\Model\StoreResolver->getDefaultStoreById() called at [vendor/magento/module-store/Model/StoreResolver.php:126]
#20 Magento\Store\Model\StoreResolver->getCurrentStoreId() called at [generated/code/Magento/Store/Model/StoreResolver/Proxy.php:105]
#21 Magento\Store\Model\StoreResolver\Proxy->getCurrentStoreId() called at [vendor/magento/module-store/Model/StoreManager.php:159]
#22 Magento\Store\Model\StoreManager->getStore() called at [generated/code/Magento/Store/Model/StoreManagerInterface/Proxy.php:129]
#23 Magento\Store\Model\StoreManagerInterface\Proxy->getStore() called at [vendor/magento/module-store/Model/Resolver/Store.php:30]
#24 Magento\Store\Model\Resolver\Store->getScope() called at [vendor/magento/framework/App/Config/ScopeCodeResolver.php:49]
#25 Magento\Framework\App\Config\ScopeCodeResolver->resolve() called at [vendor/magento/framework/App/Config.php:63]
#26 Magento\Framework\App\Config->getValue() called at [vendor/magento/module-backend/App/Area/FrontNameResolver.php:131]
#27 Magento\Backend\App\Area\FrontNameResolver->isHostBackend() called at [vendor/magento/module-backend/App/Area/FrontNameResolver.php:107]
#28 Magento\Backend\App\Area\FrontNameResolver->getFrontName() called at [vendor/magento/framework/App/AreaList.php:75]
#29 Magento\Framework\App\AreaList->getCodeByFrontName() called at [vendor/magento/framework/App/Http.php:111]
#30 Magento\Framework\App\Http->launch() called at [vendor/magento/framework/Interception/Interceptor.php:58]
#31 Magento\Framework\App\Http\Interceptor->___callParent() called at [vendor/magento/framework/Interception/Interceptor.php:138]
#32 Magento\Framework\App\Http\Interceptor->Magento\Framework\Interception\{closure}() called at [vendor/magento/module-application-performance-monitor/Plugin/ApplicationPerformanceMonitor.php:38]
#33 Magento\ApplicationPerformanceMonitor\Plugin\ApplicationPerformanceMonitor->aroundLaunch() called at [vendor/magento/framework/Interception/Interceptor.php:135]
#34 Magento\Framework\App\Http\Interceptor->Magento\Framework\Interception\{closure}() called at [vendor/magento/framework/Interception/Interceptor.php:153]
#35 Magento\Framework\App\Http\Interceptor->___callPlugins() called at [generated/code/Magento/Framework/App/Http/Interceptor.php:23]
#36 Magento\Framework\App\Http\Interceptor->launch() called at [vendor/magento/framework/App/Bootstrap.php:264]
#37 Magento\Framework\App\Bootstrap->run() called at [pub/index.php:30]
</pre>