There was a similar outage with the same error this time last week but only for a few minutes. Seeing that VB database error message sends shivers down my spine even when its not my database,
It's kinda nice for them to finally see that annoying error. I kept getting bombarded with them but I could never explain how that happened. Ironically, only happened with vBulletin 4. No other application.
Not unique to vBulletin 4, or any specific application. A few occurances of it have lead me to find that the tmp drive was full so mysql could not make new connections.