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I suggest you run x-forum, it is better, also enable the file based cache on the module in your general preferences. The only problem with the file based cache is if your forum is really big you will end up with stuff like a 10GB file cache in xoops_data..
The other things that could be causing this is a DOS attack or some heavily loaded bot crawling your site, this form of harvesting is seen as malicious for some of the bots and i suggest you run xortify client on your machine with protector possibly.
Yeah I am aware of the heavy load caused by newbb that is why I started xforum and removed some of the bulk from it as well as adding multifielding and multilingual features. You can get X-Forum from:
http://code.google.com/p/chronolabs/downloads/detail?name=xoops2.5_xforum_5.85.zipAnd you can get Xortify from:
http://code.google.com/p/chronolabs/downloads/detail?name=xoops2.5_xortify_3.05.zip - Xortify will also prevent spammers form signing up and spamming your forum. I am talking to stop forum spam about using there spam samples database to make a hierestic checking spam content addition to xortify so things are given a percentile and check whether they are spam or not.. Still waiting on pauls response.
There is a script with X-Forum which allows you to cross over to it from newbb.. It shouldn't need any modification with your existing version, but if you need any help my email address and IM details (not available to midday AEST tomorrow) are on my profile.
www.ohloh.net/accounts/226400
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