MediaWiki internal error.

Original exception: exception 'DBQueryError' with message 'A database error has occurred
Query: SELECT value,exptime FROM `wiki_objectcache` WHERE keyname='itaka-wiki_:messages:ru'
Function: MediaWikiBagOStuff::_doquery
Error: 144 Table './itaka/wiki_objectcache' is marked as crashed and last (automatic?) repair failed (localhost)
' in /home/itaka/www/itaka.pw/wikitaka/includes/db/Database.php:610
Stack trace:
#0 /home/itaka/www/itaka.pw/wikitaka/includes/db/Database.php(565): Database->reportQueryError('Table './itaka/...', 144, 'SELECT value,ex...', 'MediaWikiBagOSt...', false)
#1 /home/itaka/www/itaka.pw/wikitaka/includes/BagOStuff.php(454): Database->query('SELECT value,ex...', 'MediaWikiBagOSt...')
#2 /home/itaka/www/itaka.pw/wikitaka/includes/BagOStuff.php(324): MediaWikiBagOStuff->_doquery('SELECT value,ex...')
#3 /home/itaka/www/itaka.pw/wikitaka/includes/BagOStuff.php(240): SqlBagOStuff->_query('SELECT value,ex...', 'itaka-wiki_:mes...')
#4 /home/itaka/www/itaka.pw/wikitaka/includes/MessageCache.php(246): SqlBagOStuff->get('itaka-wiki_:mes...')
#5 /home/itaka/www/itaka.pw/wikitaka/includes/MessageCache.php(606): MessageCache->load('ru')
#6 /home/itaka/www/itaka.pw/wikitaka/includes/MessageCache.php(543): MessageCache->getMsgFromNamespace('Group-user', 'ru')
#7 /home/itaka/www/itaka.pw/wikitaka/includes/GlobalFunctions.php(467): MessageCache->get('group-user', true, false)
#8 /home/itaka/www/itaka.pw/wikitaka/includes/GlobalFunctions.php(432): wfMsgGetKey('group-user', true, false, true)
#9 /home/itaka/www/itaka.pw/wikitaka/includes/GlobalFunctions.php(338): wfMsgReal('group-user', Array, true)
#10 /home/itaka/www/itaka.pw/wikitaka/includes/User.php(2782): wfMsg('group-user')
#11 /home/itaka/www/itaka.pw/wikitaka/includes/Title.php(1287): User::getGroupName('user')
#12 /home/itaka/www/itaka.pw/wikitaka/includes/Title.php(1069): Title->getUserPermissionsErrorsInternal('edit', Object(User), true)
#13 /home/itaka/www/itaka.pw/wikitaka/includes/EditPage.php(392): Title->getUserPermissionsErrors('edit', Object(User))
#14 /home/itaka/www/itaka.pw/wikitaka/includes/EditPage.php(349): EditPage->edit()
#15 /home/itaka/www/itaka.pw/wikitaka/includes/Wiki.php(492): EditPage->submit()
#16 /home/itaka/www/itaka.pw/wikitaka/includes/Wiki.php(59): MediaWiki->performAction(Object(OutputPage), Object(Article), Object(Title), Object(User), Object(WebRequest))
#17 /home/itaka/www/itaka.pw/wikitaka/index.php(93): MediaWiki->initialize(Object(Title), Object(Article), Object(OutputPage), Object(User), Object(WebRequest))
#18 {main}

Exception caught inside exception handler: exception 'DBUnexpectedError' with message 'Error in fetchObject(): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (111) (localhost)' in /home/itaka/www/itaka.pw/wikitaka/includes/db/Database.php:739
Stack trace:
#0 /home/itaka/www/itaka.pw/wikitaka/includes/MessageCache.php(330): Database->fetchObject(false)
#1 /home/itaka/www/itaka.pw/wikitaka/includes/MessageCache.php(264): MessageCache->loadFromDB('ru')
#2 /home/itaka/www/itaka.pw/wikitaka/includes/MessageCache.php(606): MessageCache->load('ru')
#3 /home/itaka/www/itaka.pw/wikitaka/includes/MessageCache.php(543): MessageCache->getMsgFromNamespace('Databaseerror', 'ru')
#4 /home/itaka/www/itaka.pw/wikitaka/includes/GlobalFunctions.php(467): MessageCache->get('databaseerror', true, false)
#5 /home/itaka/www/itaka.pw/wikitaka/includes/GlobalFunctions.php(432): wfMsgGetKey('databaseerror', true, false, true)
#6 /home/itaka/www/itaka.pw/wikitaka/includes/Exception.php(70): wfMsgReal('databaseerror', Array)
#7 /home/itaka/www/itaka.pw/wikitaka/includes/db/Database.php(2569): MWException->msg('databaseerror', 'Database error')
#8 /home/itaka/www/itaka.pw/wikitaka/includes/Exception.php(139): DBQueryError->getPageTitle()
#9 /home/itaka/www/itaka.pw/wikitaka/includes/Exception.php(174): MWException->reportHTML()
#10 /home/itaka/www/itaka.pw/wikitaka/includes/Exception.php(260): MWException->report()
#11 /home/itaka/www/itaka.pw/wikitaka/includes/Exception.php(294): wfReportException(Object(DBQueryError))
#12 [internal function]: wfExceptionHandler(Object(DBQueryError))
#13 {main}