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It is very common to get SQL busy errors if there are too many people on a shared box. Especially if, as was already said, that someone has a persistent connection set up in one of their scripts. That means your box is down one connection from the get go. Get a couple of people doing that, and it is very easy to tie up SQL on any shared box. If you are really concerned, you might want to look a a dedicated box, or if you don't know a lot about the technical side, look at managed hosting.
Running a site on a shared server presents you with many problems you would not otherwise find, and it puts you at the risk of other webmasters!
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