请等待几分钟后重试。
（无法访问数据库）
Backtrace:
#0 /var/www/wiki/includes/libs/rdbms/database/DatabaseMySQL.php(136): Wikimedia\Rdbms\Database->newExceptionAfterConnectError()
#1 /var/www/wiki/includes/libs/rdbms/database/Database.php(263): Wikimedia\Rdbms\DatabaseMySQL->open()
#2 /var/www/wiki/includes/libs/rdbms/database/DatabaseFactory.php(157): Wikimedia\Rdbms\Database->initConnection()
#3 /var/www/wiki/extensions/Cargo/includes/CargoUtils.php(87): Wikimedia\Rdbms\DatabaseFactory->create()
#4 /var/www/wiki/extensions/Cargo/includes/parserfunctions/CargoDeclare.php(338): CargoUtils::getDB()
#5 /var/www/wiki/extensions/Cargo/includes/parserfunctions/CargoDeclare.php(148): CargoDeclare::declareTable()
#6 /var/www/wiki/includes/parser/Parser.php(3436): CargoDeclare::run()
#7 /var/www/wiki/includes/parser/Parser.php(3117): MediaWiki\Parser\Parser->callParserFunction()
#8 /var/www/wiki/includes/parser/PPFrame_Hash.php(280): MediaWiki\Parser\Parser->braceSubstitution()
#9 /var/www/wiki/includes/parser/Parser.php(2951): MediaWiki\Parser\PPFrame_Hash->expand()
#10 /var/www/wiki/includes/parser/Parser.php(1599): MediaWiki\Parser\Parser->replaceVariables()
#11 /var/www/wiki/includes/parser/Parser.php(701): MediaWiki\Parser\Parser->internalParse()
#12 /var/www/wiki/includes/content/WikitextContentHandler.php(384): MediaWiki\Parser\Parser->parse()
#13 /var/www/wiki/includes/content/ContentHandler.php(1691): MediaWiki\Content\WikitextContentHandler->fillParserOutput()
#14 /var/www/wiki/includes/content/Renderer/ContentRenderer.php(79): MediaWiki\Content\ContentHandler->getParserOutput()
#15 /var/www/wiki/includes/Revision/RenderedRevision.php(263): MediaWiki\Content\Renderer\ContentRenderer->getParserOutput()
#16 /var/www/wiki/includes/Revision/RenderedRevision.php(236): MediaWiki\Revision\RenderedRevision->getSlotParserOutputUncached()
#17 /var/www/wiki/includes/Revision/RevisionRenderer.php(239): MediaWiki\Revision\RenderedRevision->getSlotParserOutput()
#18 /var/www/wiki/includes/Revision/RevisionRenderer.php(172): MediaWiki\Revision\RevisionRenderer->combineSlotOutput()
#19 [internal function]: MediaWiki\Revision\RevisionRenderer->MediaWiki\Revision\{closure}()
#20 /var/www/wiki/includes/Revision/RenderedRevision.php(199): call_user_func()
#21 /var/www/wiki/includes/poolcounter/PoolWorkArticleView.php(106): MediaWiki\Revision\RenderedRevision->getRevisionParserOutput()
#22 /var/www/wiki/includes/poolcounter/PoolWorkArticleViewCurrent.php(123): MediaWiki\PoolCounter\PoolWorkArticleView->renderRevision()
#23 /var/www/wiki/includes/poolcounter/PoolCounterWork.php(171): MediaWiki\PoolCounter\PoolWorkArticleViewCurrent->doWork()
#24 /var/www/wiki/includes/page/ParserOutputAccess.php(362): MediaWiki\PoolCounter\PoolCounterWork->execute()
#25 /var/www/wiki/includes/page/Article.php(827): MediaWiki\Page\ParserOutputAccess->getParserOutput()
#26 /var/www/wiki/includes/page/Article.php(547): Article->generateContentOutput()
#27 /var/www/wiki/includes/actions/ViewAction.php(78): Article->view()
#28 /var/www/wiki/includes/actions/ActionEntryPoint.php(737): ViewAction->show()
#29 /var/www/wiki/includes/actions/ActionEntryPoint.php(514): MediaWiki\Actions\ActionEntryPoint->performAction()
#30 /var/www/wiki/includes/actions/ActionEntryPoint.php(146): MediaWiki\Actions\ActionEntryPoint->performRequest()
#31 /var/www/wiki/includes/MediaWikiEntryPoint.php(200): MediaWiki\Actions\ActionEntryPoint->execute()
#32 /var/www/wiki/index.php(58): MediaWiki\MediaWikiEntryPoint->run()
#33 {main}