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(Cannot access the database: Too many connections (127.0.0.1))

Backtrace:

#0 /var/www/mediawiki/includes/libs/rdbms/loadbalancer/LoadBalancer.php(1134): Wikimedia\Rdbms\Database->reportConnectionError('Too many connec...')
#1 /var/www/mediawiki/includes/libs/rdbms/loadbalancer/LoadBalancer.php(749): Wikimedia\Rdbms\LoadBalancer->reportConnectionError()
#2 /var/www/mediawiki/includes/GlobalFunctions.php(2801): Wikimedia\Rdbms\LoadBalancer->getConnection(0, Array, false)
#3 /var/www/mediawiki/includes/interwiki/ClassicInterwikiLookup.php(286): wfGetDB(-1)
#4 /var/www/mediawiki/includes/libs/objectcache/WANObjectCache.php(1240): MediaWiki\Interwiki\ClassicInterwikiLookup->MediaWiki\Interwiki\{closure}(false, 10800, Array, NULL)
#5 /var/www/mediawiki/includes/libs/objectcache/WANObjectCache.php(1114): WANObjectCache->doGetWithSetCallback('mediawikidb:int...', 10800, Object(Closure), Array)
#6 /var/www/mediawiki/includes/interwiki/ClassicInterwikiLookup.php(298): WANObjectCache->getWithSetCallback('mediawikidb:int...', 10800, Object(Closure))
#7 /var/www/mediawiki/includes/interwiki/ClassicInterwikiLookup.php(155): MediaWiki\Interwiki\ClassicInterwikiLookup->load('\xE6\x8F\xAD\xE5\xAF\x86\xE7\x9C\x9F\xE7\x9B\xB8')
#8 /var/www/mediawiki/includes/interwiki/ClassicInterwikiLookup.php(131): MediaWiki\Interwiki\ClassicInterwikiLookup->fetch('\xE6\x8F\xAD\xE5\xAF\x86\xE7\x9C\x9F\xE7\x9B\xB8')
#9 /var/www/mediawiki/includes/title/MediaWikiTitleCodec.php(334): MediaWiki\Interwiki\ClassicInterwikiLookup->isValidInterwiki('\xE6\x8F\xAD\xE5\xAF\x86\xE7\x9C\x9F\xE7\x9B\xB8')
#10 /var/www/mediawiki/includes/Title.php(3631): MediaWikiTitleCodec->splitTitleString('\xE6\x8F\xAD\xE5\xAF\x86\xE7\x9C\x9F\xE7\x9B\xB8:\xE6\x8D...', 0)
#11 /var/www/mediawiki/includes/Title.php(366): Title->secureAndSplit()
#12 /var/www/mediawiki/includes/MediaWiki.php(85): Title::newFromURL('\xE6\x8F\xAD\xE5\xAF\x86\xE7\x9C\x9F\xE7\x9B\xB8:\xE6\x8D...')
#13 /var/www/mediawiki/includes/MediaWiki.php(141): MediaWiki->parseTitle()
#14 /var/www/mediawiki/includes/MediaWiki.php(777): MediaWiki->getTitle()
#15 /var/www/mediawiki/includes/MediaWiki.php(524): MediaWiki->main()
#16 /var/www/mediawiki/index.php(42): MediaWiki->run()
#17 {main}

在此期间您可以尝试用 Google 来搜索。
须注意其索引出来的内容可能不是最新的。