Exception encountered, of type "PDOException"
[c93d7a9711cd8dbf5967bebb] /index.php?action=history&title=%E3%83%97%E3%83%AC%E3%83%9F%E3%82%B9%E3%83%88%E6%B5%9C%E6%9D%BE%E4%B8%AD%E5%A4%AE%E3%82%BF%E3%83%AF%E3%83%BC PDOException from line 309 of /var/www/html/mediawiki/includes/title/MediaWikiTitleCodec.php: SQLSTATE[HY000] [1040] Too many connections
Backtrace:
#0 /var/www/html/mediawiki/includes/title/MediaWikiTitleCodec.php(309): PDO->__construct(string, string, string)
#1 /var/www/html/mediawiki/includes/Title.php(3343): MediaWikiTitleCodec->splitTitleString(string, integer)
#2 /var/www/html/mediawiki/includes/Title.php(332): Title->secureAndSplit()
#3 /var/www/html/mediawiki/includes/Title.php(287): Title::newFromTextThrow(string, integer)
#4 /var/www/html/mediawiki/includes/skins/Skin.php(931): Title::newFromText(string)
#5 /var/www/html/mediawiki/includes/skins/Skin.php(957): Skin->footerLink(string, string)
#6 /var/www/html/mediawiki/includes/skins/SkinTemplate.php(420): Skin->aboutLink()
#7 /var/www/html/mediawiki/includes/skins/SkinTemplate.php(246): SkinTemplate->prepareQuickTemplate(OutputPage)
#8 /var/www/html/mediawiki/includes/OutputPage.php(2324): SkinTemplate->outputPage()
#9 /var/www/html/mediawiki/includes/MediaWiki.php(753): OutputPage->output()
#10 /var/www/html/mediawiki/includes/MediaWiki.php(519): MediaWiki->main()
#11 /var/www/html/mediawiki/index.php(43): MediaWiki->run()
#12 {main}