This is the error I'm getting on my XF page: Code: Mysqli prepare error: Unknown storage engine 'InnoDB' 1. Zend_Db_Statement_Mysqli->_prepare() in Zend/Db/Statement.php at line 115 2. Zend_Db_Statement->__construct() in Zend/Db/Adapter/Mysqli.php at line 381 3. Zend_Db_Adapter_Mysqli->prepare() in Zend/Db/Adapter/Abstract.php at line 478 4. Zend_Db_Adapter_Abstract->query() in XenForo/Model.php at line 219 5. XenForo_Model->fetchAllKeyed() in XenForo/Model/Forum.php at line 133 6. XenForo_Model_Forum->getExtraForumDataForNodes() in XenForo/NodeHandler/Forum.php at line 85 7. XenForo_NodeHandler_Forum->getExtraDataForNodes() in XenForo/Model/Node.php at line 571 8. XenForo_Model_Node->mergeExtraNodeDataIntoNodeList() in XenForo/Model/Node.php at line 773 9. XenForo_Model_Node->getNodeListDisplayData() in XenForo/Model/Node.php at line 745 10. XenForo_Model_Node->getNodeDataForListDisplay() in XenForo/ControllerPublic/Forum.php at line 40 11. XenForo_ControllerPublic_Forum->actionIndex() in WidgetFramework/XenForo/ControllerPublic/Forum.php at line 13 12. WidgetFramework_XenForo_ControllerPublic_Forum->actionIndex() in XenForo/FrontController.php at line 347 13. XenForo_FrontController->dispatch() in XenForo/FrontController.php at line 134 14. XenForo_FrontController->run() in /home/cortjohn/public_html/forums/index.php at line 13 Server logs show out of memory because of too many php processes opened up which cause mysqld to shutdown. The WordPress installation associated with MyISAM works fine. The error goes away once I have restarted the mysql service. I'm unable to fix the issue. Would be grateful for some input! MySQL logs: Code: ..more similar errors above.. 150117 20:18:56 [ERROR] Cannot find or open table wpdb/wp_wpsa_subscribe_author from the internal data dictionary of InnoDB though the .frm file for the table exists. Maybe you have deleted and recreated InnoDB data files but have forgotten to delete the corresponding .frm files of InnoDB tables, or you have moved .frm files to another database? or, the table contains indexes that this version of the engine doesn't support. 150117 21:24:38 [Warning] IP address '18.104.22.168' could not be resolved: Name or service not known 150117 21:38:35 mysqld_safe Number of processes running now: 0 150117 21:38:35 mysqld_safe mysqld restarted 150117 21:38:38 [Note] Plugin 'FEDERATED' is disabled. 150117 21:38:38 InnoDB: The InnoDB memory heap is disabled 150117 21:38:38 InnoDB: Mutexes and rw_locks use GCC atomic builtins 150117 21:38:38 InnoDB: Compressed tables use zlib 1.2.3 150117 21:38:38 InnoDB: Using Linux native AIO 150117 21:38:39 InnoDB: Initializing buffer pool, size = 119.0M InnoDB: mmap(127713280 bytes) failed; errno 12 150117 21:38:39 InnoDB: Completed initialization of buffer pool 150117 21:38:39 InnoDB: Fatal error: cannot allocate memory for the buffer pool 150117 21:38:39 [ERROR] Plugin 'InnoDB' init function returned error. 150117 21:38:39 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed. 150117 21:38:39 [Note] Server hostname (bind-address): '0.0.0.0'; port: 3306 150117 21:38:39 [Note] - '0.0.0.0' resolves to '0.0.0.0'; 150117 21:38:39 [Note] Server socket created on IP: '0.0.0.0'. 150117 21:38:40 [Note] Event Scheduler: Loaded 0 events 150117 21:38:40 [Note] /usr/sbin/mysqld: ready for connections. Version: '5.5.40-cll' socket: '/var/lib/mysql/mysql.sock' port: 3306 MySQL Community Server (GPL) 150117 21:38:40 [ERROR] /usr/sbin/mysqld: Table './wpdb/wp_wfConfig' is marked as crashed and should be repaired 150117 21:38:40 [ERROR] /usr/sbin/mysqld: Table './wpdb/wp_wfConfig' is marked as crashed and should be repaired ...more similar errors follow.. Could the innodb_buffer_pool_size be insufficient? I have 4 GB RAM and am running a WP instance too.