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a) One of the hacks/pluggins you use in vbulletin might be bogging down the server with too many connections or by slowing down the server somehow. To make sure this is not the culprit make sure you disable too third party pluggins in your vbulletin admin cp and see if you still get the error or not.
b) A vbulletin default query might taking a long time to run, locking all tables during the run and while tables are locked, new MYSQL queries triggered by other visitors compiles and cause the error. If your post count is too many, you have a high traffic and default vbulletin searching is used frequently you can have this problem because database search in a crowded board is always a bottleneck which can cause this error.
Yes, so have I.Been getting this one off and on all evening...
OK, got a new db error message in the form of admin maitenane at 11:20pm est. I think it's an error since when I refreshed, AF loaded
DB errors galore this morning, off-and-on since about 6:30am Central U.S. time.

What's happening to this site?