Lately the following error occurs on my board from time to time:

[quote]Warning: Can't create a new thread (errno 11). If you are not out of available memory, you can consult the manual for a possible OS-dependent bug in /var/www/hardwareinfo/www.hardwareforum.nl/www/admin/db_mysql.php on line 31

There seems to have been a slight problem with the database. Please try again by pressing the refresh button in your browser.

An E-Mail has been dispatched to our Technical Staff, who you can also contact if the problem persists.

We apologise for any inconvenience. [/quote]

My server specs:
Hardware: i686, 256MB RAM
Software: Apache/1.3.12 (Unix) Debian/GNU PHP/4.0.3pl1 AuthMySQL/2.20 MySQL/3.23.25-beta-log on Debain Linux
I'm using vBulletin 1.1.5 at [url]http://www.hardwareforum.nl/[/url] (I translated the templates to the Dutch language)

I share the server with several other sites, some of which also use MySQL. Serverload doesn't seem to be to high, I just can't seem to figure out this error.