Wikimedia Bugzilla is closed!

I have to servers, server1 and server2.  Both servers run apache and server1
runs mysql.  I have a mediawiki (mediawiki-1.4.6) setup on server1 for company A.  

I installed the newest stable release (mediawiki-1.5.6) on server2 for another
company.  I installed it to the same database server on server1, but different
username, password and database name.  Installation went fine for the new wiki
however my old version for company A stop working I recieved this error:

Fatal error: Call to a member function on a non-object in ObjectCache.php on
line 409

Upon investigation I saw this in my db tables of mysql database.

select Host, Db, User from db order by Db;
| %                     | musicmsn_wiki     | mbvr          |
| localhost             | musicmsn_wiki     | mbvr          |
| localhost.localdomain | musicmsn_wiki     | mbvr          |
| %                     | musicmsn_wiki     | msndb         |
| localhost             | musicmsn_wiki     | msndb         |
| localhost.localdomain | musicmsn_wiki     | msndb         |

for User 'mbvr' the db should have been 'wikidb'

I had wiki installer setup my new user 'msndb'.  Somehow it collebered 'mbvr'
database name.

I set the database back:
update db set Db='wikidb' where User='mbvr' and Db='musicmsn_wiki';

flushed privileges and it was working again


Good Luck