Hello

I already posted this problem and got no answer. I also send this mail to MySql as I do not know if MediaWiki or MySql is a the origin of the problem.

Here is the description of what happened :

I am using MySql to store two MediaWiki databases named dftdb and framesdb I am using MySql 4.1.20 I am using MediaWiki 1.9.3 I am using Scientific Linux 4.4

Each week I backup the directory /var/lib/mysql On Wednesday I lost the /var partition, the mysql version, the apache and php5, MediaWiki was the only one to stay alive.

I reinstalled the same versions of mysql, apache, php5 that were running before the crash.

I copy the the saved /var/lib/mysql directory

A third old wiki running under Mediawiki 1.3 was correctly recovered but, the new two new Wikis running under MediaWiki 1.9.3 I give the following message :

MediaWiki internal error.

Original exception: exception 'DBQueryError' with message 'A database error has occurred Query: SELECT value,exptime FROM `dft_objectcache` WHERE keyname='dftdb-dft_:messages-hash' Function: MediaWikiBagOStuff::_doquery Error: 1016 Can't open file: 'dft_objectcache.ibd' (errno: 1) (localhost) ' in /home/dft/public_html/mediawiki/includes/Database.php:708

under phpMyAdmin these databases have no Type defined for the 33 tables excepted 3 which have MyiSAM type. The Collation column give "in use".

If somebody could tell me what hapenned ? How a running database could become unreadable after reinstalling Mediawiki. Is it possible that this were connected with the InnoDb type which is the default used by phpMyAdmin at database creation ?

Thanks

Francois Colonna