Randal Schwartz wrote an article on this subject titled, Throttling Your Web Server which might be useful.

Otherwise I would think that settings in your robots.txt might be sufficient to tell the spider to either slow down (there's a Crawl-delay directive) or to simply stop spidering your site.

If you are using Apache (or any modern HTTP server I think) you can, of course, simply deny certain IP addresses.

Celebrate Intellectual Diversity

In reply to Re: Optimize DBI connect to avoid max_user_connections by InfiniteSilence
in thread Optimize DBI connect to avoid max_user_connections by Alex-WisdomSeeker

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