mysql going down like every 2 weeks

could it be that the mysql server goes down, because of spiders from search machines like google, that scan the 2 phpbb forums running here, and thus create an awful lot of session ids for them that cause the mysqld to go down?

can i deny them access with someting like this in root dir:?
User-agent: *
Disallow: /cgi-bin/
Disallow: /forum

robots.txt file
 
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