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I have a SQL database max_questions resource problem also. So, I will try to give as much info as possible.
My site regularly goes down and leads to a blank page. I first noticed this when I was making a lot of changes to the site and uploading lots of database tables. Apparently, my web host limits the number of database queries over some unknown time frame to 50000. Sometimes the site will go down for just a few minutes, and other times for up to one hour when this limit has been reached. The error max_questions error shows up when the site is down and I log into phpMyAdmin. The databases that normally show up, do not, and an SQL error message shows up indicating that the max_questions limit of 50K has been reached. The webhost told me that this will always reset within an hour.
This first showed up as only a problem when I was doing extensive upgrading of modules or database tables and running a lot of queries. But now the problem shows up repeatedly and on a daily basis even when no extensive database changes or site development is happening. My site has recently been receiving more user and robot activity, but it is still very low traffic on average, receiving a max of 3000 unique visits a day. Hits on on the order of 100K per day. Still, I feel either the limit of 50K queries is low, or for some reason XOOPS is running a lot of database activity upon page loading that may not be necessary.
Thoughts?