MediaWiki internal error.

Original exception: exception 'DBQueryError' with message 'A database error has occurred
Query: SELECT rev_id,rev_page,rev_text_id,rev_timestamp,rev_comment,rev_user_text,rev_user,rev_minor_edit,rev_deleted,rev_len,rev_parent_id,page_namespace,page_title,page_latest FROM `wiki_jppage`,`wiki_jprevision` WHERE (page_id=rev_page) AND rev_id = '4' LIMIT 1
Function: Revision::fetchFromConds
Error: 1033 Incorrect information in file: './usr_web4_1/wiki_jppage.frm' (localhost)
' in /var/www/web4/html/includes/db/Database.php:636
Stack trace:
#0 /var/www/web4/html/includes/db/Database.php(591): Database->reportQueryError('Incorrect infor...', 1033, 'SELECT rev_id,...', 'Revision::fetch...', false)
#1 /var/www/web4/html/includes/db/Database.php(1001): Database->query('SELECT rev_id,...', 'Revision::fetch...')
#2 /var/www/web4/html/includes/Revision.php(249): Database->select(Array, Array, Array, 'Revision::fetch...', Array)
#3 /var/www/web4/html/includes/Revision.php(178): Revision::fetchFromConds(Object(DatabaseMysql), Array)
#4 /var/www/web4/html/includes/Revision.php(159): Revision::loadFromConds(Object(DatabaseMysql), Array)
#5 /var/www/web4/html/includes/Revision.php(32): Revision::newFromConds(Array)
#6 /var/www/web4/html/includes/Wiki.php(121): Revision::newFromId(4)
#7 /var/www/web4/html/wiki(58): MediaWiki->checkInitialQueries('?????????:Porte...', 'view')
#8 {main}

Exception caught inside exception handler: exception 'DBUnexpectedError' with message 'Error in fetchObject(): Incorrect information in file: './usr_web4_1/wiki_jppage.frm' (localhost)' in /var/www/web4/html/includes/db/Database.php:763
Stack trace:
#0 /var/www/web4/html/includes/MessageCache.php(340): Database->fetchObject(false)
#1 /var/www/web4/html/includes/MessageCache.php(268): MessageCache->loadFromDB('ja')
#2 /var/www/web4/html/includes/MessageCache.php(589): MessageCache->load('ja')
#3 /var/www/web4/html/includes/MessageCache.php(526): MessageCache->getMsgFromNamespace('Databaseerror', 'ja')
#4 /var/www/web4/html/includes/GlobalFunctions.php(583): MessageCache->get('databaseerror', true, false)
#5 /var/www/web4/html/includes/GlobalFunctions.php(548): wfMsgGetKey('databaseerror', true, false, true)
#6 /var/www/web4/html/includes/Exception.php(70): wfMsgReal('databaseerror', Array)
#7 /var/www/web4/html/includes/db/Database.php(2617): MWException->msg('databaseerror', 'Database error')
#8 /var/www/web4/html/includes/Exception.php(201): DBQueryError->getPageTitle()
#9 /var/www/web4/html/includes/Exception.php(164): MWException->htmlHeader()
#10 /var/www/web4/html/includes/Exception.php(183): MWException->reportHTML()
#11 /var/www/web4/html/includes/Exception.php(269): MWException->report()
#12 /var/www/web4/html/includes/Exception.php(327): wfReportException(Object(DBQueryError))
#13 [internal function]: wfExceptionHandler(Object(DBQueryError))
#14 {main}