Attacked maybe? A few server errors (220 of them) for 4 hours, but everything AOK...

[Marco van Herwaarden]

No indication that this is related to an attack.

The first 2 errors should be solved if you repair tables, see below.

See the manual on hte 3rd error: Can't connect to local MySQL server through socket

Repairing tables:
To fix this run Repair/Optimize in the Admin CP. You may need to run it more than once to fix all errors:

Admin CP -> Maintenance -> Repair/Optimize Tables -> Check All -> Continue

If you can not access your AdminCP, then you can upload the tools.php file from the vbulletin .zip file do_not_upload/ folder into your forumdir/admincp/ directory and run it through the browser, there's a switch there to run optimize and repair. Run it a few times for best result.

If you cannot access either the Admin CP or tools.php you can also use a tool like phpMyAdmin to repair tables.