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A MySQL Programming Mystery? Database Updated Value Increased By More Than Expected 1

http://en.wikipedia.org/wiki/File:Miniaturk_009.jpg Topic: 40 permalink
Visits: 2,526 You have a website.  
You keep track of visits.  
Each time a vistor visits a page you update your database visits for that page by 1.  
Yet, alas! The field is always updated by some value higher than 1.  
Is there a bug in mySql?  
Nope, wrong questions.  
Right question: do you have advertisments on your pages?  
Oh, you do?  
 
Cool, there may be a robot following your pageloads, summoned by the ads loaded together with the page - thence the multiple visits, particularly the first time you visit a new page or if you visit it again after a pause: the robot may visit it once and be quiet for a while; then, solicited by several pageloads (of the ads included in the webpage), suddenly it may arrive again!
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