MediaWiki internal error.

Original exception: [XtHK-CU7J44AACiLLA8AAAAE] /index.php/Tropical_Depression_Ten_(2007) Wikimedia\Rdbms\DBQueryError from line 1149 of /var/www/wiki/includes/libs/rdbms/database/Database.php: A database query error has occurred. Did you forget to run your application's database schema updater after upgrading?
Query: SELECT page_id,page_len,page_is_redirect,page_latest,page_content_model FROM `page` WHERE page_namespace = '828' AND page_title = 'Check_for_unknown_parameters' LIMIT 1
Function: LinkCache::fetchPageRow
Error: 1053 Server shutdown in progress (localhost)

Backtrace:
#0 /var/www/wiki/includes/libs/rdbms/database/Database.php(979): Wikimedia\Rdbms\Database->reportQueryError(string, integer, string, string, boolean)
#1 /var/www/wiki/includes/libs/rdbms/database/Database.php(1343): Wikimedia\Rdbms\Database->query(string, string)
#2 /var/www/wiki/includes/libs/rdbms/database/Database.php(1411): Wikimedia\Rdbms\Database->select(string, array, array, string, array, array)
#3 /var/www/wiki/includes/cache/LinkCache.php(312): Wikimedia\Rdbms\Database->selectRow(string, array, array, string)
#4 /var/www/wiki/includes/cache/LinkCache.php(270): LinkCache->fetchPageRow(Wikimedia\Rdbms\DatabaseMysqli, Title)
#5 /var/www/wiki/includes/Title.php(3344): LinkCache->addLinkObj(Title)
#6 /var/www/wiki/includes/Title.php(991): Title->getArticleID(integer)
#7 /var/www/wiki/includes/Title.php(1012): Title->getContentModel()
#8 /var/www/wiki/extensions/Scribunto/common/Hooks.php(104): Title->hasContentModel(string)
#9 /var/www/wiki/includes/parser/Parser.php(3383): ScribuntoHooks::invokeHook(Parser, PPTemplateFrame_DOM, array)
#10 /var/www/wiki/includes/parser/Parser.php(3106): Parser->callParserFunction(PPTemplateFrame_DOM, string, array)
#11 /var/www/wiki/includes/parser/Preprocessor_DOM.php(1229): Parser->braceSubstitution(array, PPTemplateFrame_DOM)
#12 /var/www/wiki/includes/parser/Preprocessor_DOM.php(1680): PPFrame_DOM->expand(DOMElement, integer)
#13 /var/www/wiki/includes/parser/Parser.php(3259): PPTemplateFrame_DOM->cachedExpand(string, PPNode_DOM)
#14 /var/www/wiki/includes/parser/Preprocessor_DOM.php(1229): Parser->braceSubstitution(array, PPFrame_DOM)
#15 /var/www/wiki/includes/parser/Parser.php(2921): PPFrame_DOM->expand(DOMElement, integer)
#16 /var/www/wiki/includes/parser/Parser.php(1277): Parser->replaceVariables(string)
#17 /var/www/wiki/includes/parser/Parser.php(451): Parser->internalParse(string)
#18 /var/www/wiki/includes/StubObject.php(111): Parser->parse(string, Title, ParserOptions, boolean, boolean, integer)
#19 /var/www/wiki/includes/StubObject.php(137): StubObject->_call(string, array)
#20 /var/www/wiki/includes/content/WikitextContent.php(329): StubObject->__call(string, array)
#21 /var/www/wiki/includes/content/AbstractContent.php(516): WikitextContent->fillParserOutput(Title, integer, ParserOptions, boolean, ParserOutput)
#22 /var/www/wiki/includes/poolcounter/PoolWorkArticleView.php(144): AbstractContent->getParserOutput(Title, integer, ParserOptions)
#23 /var/www/wiki/includes/poolcounter/PoolCounterWork.php(123): PoolWorkArticleView->doWork()
#24 /var/www/wiki/includes/page/Article.php(585): PoolCounterWork->execute()
#25 /var/www/wiki/includes/actions/ViewAction.php(68): Article->view()
#26 /var/www/wiki/includes/MediaWiki.php(499): ViewAction->show()
#27 /var/www/wiki/includes/MediaWiki.php(293): MediaWiki->performAction(Article, Title)
#28 /var/www/wiki/includes/MediaWiki.php(851): MediaWiki->performRequest()
#29 /var/www/wiki/includes/MediaWiki.php(523): MediaWiki->main()
#30 /var/www/wiki/index.php(43): MediaWiki->run()
#31 {main}

Exception caught inside exception handler: [XtHK-CU7J44AACiLLA8AAAAE] /index.php/Tropical_Depression_Ten_(2007) Wikimedia\Rdbms\DBConnectionError from line 800 of /var/www/wiki/includes/libs/rdbms/database/Database.php: Cannot access the database: No such file or directory (localhost)
Backtrace:
#0 /var/www/wiki/includes/libs/rdbms/loadbalancer/LoadBalancer.php(1028): Wikimedia\Rdbms\Database->reportConnectionError(string)
#1 /var/www/wiki/includes/libs/rdbms/loadbalancer/LoadBalancer.php(670): Wikimedia\Rdbms\LoadBalancer->reportConnectionError()
#2 /var/www/wiki/includes/GlobalFunctions.php(2858): Wikimedia\Rdbms\LoadBalancer->getConnection(integer, array, boolean)
#3 /var/www/wiki/includes/cache/localisation/LCStoreDB.php(45): wfGetDB(integer)
#4 /var/www/wiki/includes/cache/localisation/LocalisationCache.php(392): LCStoreDB->get(string, string)
#5 /var/www/wiki/includes/cache/localisation/LocalisationCache.php(291): LocalisationCache->loadSubitem(string, string, string)
#6 /var/www/wiki/languages/Language.php(2587): LocalisationCache->getSubitem(string, string, string)
#7 /var/www/wiki/includes/cache/MessageCache.php(933): Language->getMessage(string)
#8 /var/www/wiki/includes/cache/MessageCache.php(888): MessageCache->getMessageForLang(LanguageEn, string, boolean, array)
#9 /var/www/wiki/includes/cache/MessageCache.php(828): MessageCache->getMessageFromFallbackChain(LanguageEn, string, boolean)
#10 /var/www/wiki/includes/Message.php(1275): MessageCache->get(string, boolean, LanguageEn)
#11 /var/www/wiki/includes/Message.php(842): Message->fetchMessage()
#12 /var/www/wiki/includes/Message.php(971): Message->toString(string)
#13 /var/www/wiki/includes/exception/MWExceptionRenderer.php(131): Message->escaped()
#14 /var/www/wiki/includes/exception/MWExceptionRenderer.php(54): MWExceptionRenderer::reportHTML(Wikimedia\Rdbms\DBQueryError)
#15 /var/www/wiki/includes/exception/MWExceptionHandler.php(75): MWExceptionRenderer::output(Wikimedia\Rdbms\DBQueryError, integer)
#16 /var/www/wiki/includes/exception/MWExceptionHandler.php(130): MWExceptionHandler::report(Wikimedia\Rdbms\DBQueryError)
#17 /var/www/wiki/includes/MediaWiki.php(550): MWExceptionHandler::handleException(Wikimedia\Rdbms\DBQueryError)
#18 /var/www/wiki/index.php(43): MediaWiki->run()
#19 {main}