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i suffered from this problem.
yesterday my site got about 150 visitors online.and the the MySQL down. The host admin said it's my site got the MySQL down(i have enable cache even forum)
,and then closed my site for a day. the MySQL didn't down during this day.
so he added a maxquestions limit 30000 to my db. it's only enough to let the site work for about half an hour.
however 150 online is not the most online number.Once i got 800 online, and the MySQL didn't down. Is really strange when the MySQL down, is not the highest online visitor. is there any other possible reason to cause the MySQL down?