Thread:Project:Support desk/INSERT command denied to user

Hello having problems loading up the pages on a site. Whatever page you go to comes up with the same 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 "MediaWikiBagOStuff::_doinsert". MySQL returned error "1142: INSERT command denied to user 'uwikica_514419_2'@'linweb14.atlas.pipex.net' for table 'trueobjectcache' (cust-mysql-123-01)".

the versions are MediaWiki  1.15.2 php        5.2.16 mysql      5.1.52

I googled this error and found an entry that suggested the database was over the size allowed on the hosting. If this is the case, which tables can I delete from to give back enough space to be able to load up the site?