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these are all reasonable actions to take. I have this problem but my host has a limit of 50,000 per hour or some time increment like that. I asked them to increase it and they were not very responsive. I will definitely consider switching hosts, because this problem happens all the time now that I have a decent amount of web activity (like 10 users at a time).
But my question is: what is a reasonable level of db queries for xoops? I cached all the modules and blocks that I could, but many modules and blocks don't function correctly when cached, so there is a limit to how much you can push on that lever. This happens a lot when I am editing the site or adding content, but I can't imagine hitting 50,000/hour with such regularity.
Also, see this post:
max_questions resource limit exceeded