Hi, I'm having real problems with my mediawiki database. I'm using 1.9.3, with MySQL 5.0.27-standard, and PHP 5.2.1

The problem is in two stages:

1. The following error appeared, suddenly and unexpectedly. No upgrades to the DB aside from entries/edits being made to the wiki, and no changes to the php files or anything else in the directory where the wiki is installed.

Original exception: exception 'DBQueryError' with message 'A database error has occurred Query: SELECT value,exptime FROM `objectcache` WHERE keyname='DBNAME:messages-hash' Function: MediaWikiBagOStuff::_doquery Error: 1033 Incorrect information in file: './DBNAME/objectcache.frm' (localhost) ' in /DBLOCATION/includes/Database.php:708 Stack trace: 0 /DBLOCATION/includes/Database.php(665): Database->reportQueryError('Incorrect infor...', 1033, 'SELECT value,ex...', 'MediaWikiBagOSt...', false) 1 /DBLOCATION/includes/BagOStuff.php(396): Database->query('SELECT value,ex...', 'MediaWikiBagOSt...') 2 /DBLOCATION/includes/BagOStuff.php(296): MediaWikiBagOStuff->_doquery('SELECT value,ex...') 3 /DBLOCATION/includes/BagOStuff.php(236): SqlBagOStuff->_query('SELECT value,ex...', 'DBNAME...') 4 /DBLOCATION/includes/MessageCache.php(206): SqlBagOStuff->get('DBNAME...') 5 /DBLOCATION/includes/MessageCache.php(442): MessageCache->load() 6 /DBLOCATION/includes/GlobalFunctions.php(420): MessageCache->get('mainpage', true, true) 7 /DBLOCATION/includes/GlobalFunctions.php(379): wfMsgGetKey('mainpage', true, true, true) 8 /DBLOCATION/includes/GlobalFunctions.php(328): wfMsgReal('mainpage', Array, true, true) 9 /DBLOCATION/includes/Title.php(275): wfMsgForContent() 10 /DBLOCATION/includes/Wiki.php(74): Title::newMainPage('mainpage') 11 /DBLOCATION/index.php(17): MediaWiki->checkInitialQueries() 12 {main}

Exception caught inside exception handler: exception 'DBUnexpectedError' with message 'Error in fetchObject(): Incorrect information in file: './DBNAME/page.frm' (localhost)' in /DBLOCATION/includes/Database.php:825 Stack trace: 0 /DBLOCATION/includes/MessageCache.php(315): Database->fetchObject(false) 1 /DBLOCATION/includes/MessageCache.php(252): MessageCache->loadFromDB() 2 /DBLOCATION/includes/MessageCache.php(442): MessageCache->load() 3 /DBLOCATION/includes/GlobalFunctions.php(420): MessageCache->get('databaseerror', true, false) 4 /DBLOCATION/includes/GlobalFunctions.php(379): wfMsgGetKey('databaseerror', true, false, true) 5 /DBLOCATION/includes/Exception.php(18): wfMsgReal('databaseerror', Array) 6 /DBLOCATION/includes/Database.php(212): MWException->msg('databaseerror', 'Database error') 7 /DBLOCATION/includes/Exception.php(109): DBQueryError->getPageTitle() 8 /DBLOCATION/includes/Exception.php(76): MWException->htmlHeader() 9 /DBLOCATION/includes/Exception.php(95): MWException->reportHTML() 10 /DBLOCATION/includes/Exception.php(171): MWException->report() 11 /DBLOCATION/includes/Exception.php(205): wfReportException() 12 [internal function]: wfExceptionHandler(Object(DBQueryError)) 13 {main}

Paths renamed for security reasons. When I checked out the DB and tried to repair it (which didn't work) I saw that the table objectcache was giving out an SQL #1033 error. So, I figured that was the problem.

2. I tried truncating the objectcache table, but got the #1033 error again. So, I dropped the table and recreated it using the following SQL:

DROP TABLE IF EXISTS `objectcache`; CREATE TABLE `objectcache` ( `keyname` char(255) character set latin1 collate latin1_bin NOT NULL default '', `value` mediumblob, `exptime` datetime default NULL, UNIQUE KEY `keyname` (`keyname`), KEY `exptime` (`exptime`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1;

I'm now getting the following error:

Database error A database query syntax error has occurred. This may indicate a bug in the software. The last attempted database query was: (SQL query hidden) from within function "MessageCache::loadFromDB". MySQL returned error "1033: Incorrect information in file: './DBNAME/page.frm' (localhost)".

The last part of this statement seems to change randomly between page.frm, user.frm and job.frm

I have checked my backup of the SQL database and it seems the content under -- -- Dumping data for table `objectcache` -- is all corrupted with lots of bizarre symbols etc. I tried entering it anyway, via the statement I saw in the backup .sql file I have: LOCK TABLES `objectcache` WRITE; /*!40000 ALTER TABLE `objectcache` DISABLE KEYS */; INSERT INTO `objectcache` (`keyname`, `value`, `exptime`) VALUES

But, it made no difference.

Is there a way to fix this without losing all the content of the DB (i.e. the entries/articles and so on), or am I going to have to ditch the whole thing and start up again?

Thanks in advance!

Steve