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copied!<p>Try searching for strings like <code>"ad swapping" +algorithm</code> or <code>"ad round-robin"</code>. Google didn't return anything good for the first search; try duckduckgo.com. <code>Vilx-</code> gave a great response. I'll just add what's missing:</p> <p>The asker hinted that he's worried about the very real chance that with a very high spike ("slashdot effect") providers run out of ALL rotated ads in a short amount of time. This is probably never contemplated until after it's actually happened, and it sounds like his company isn't big enough to have reached that issue. Today's web-2.0 viral "15-minutes of fame" makes that a very real issue, though.</p> <p>Because nobody wants to pay up for ads wasted on a spike that brings a "non-diverse audience", there will be non-technical problems that cannot be resolved with just code.</p> <p>That leads to the only likely response: prepare an extreme service exception clause in ad contracts to either outline a compensation / re-imbursement % policy (<strong>unfair to the poster's ad distributor company</strong>) or stop serving ads altogether just as expected (like certain stocks and sometimes entire stock exchanges completely stop all trading when something is seriously wrong - AOL did just that yesterday). After all, the million ads were all served! You can now open up to new clients! (and lose the old ones). Middle-ground policies would have to be reached, but unbalance is common... after all, we know what happens when you fully consume your site's bandwith --shutdowns and/or rude billing messages that show the leasee isn't getting unfair service beyond the traffic they contracted... capped phone data plans are another example... you either bill extra and lose the customer, or stop providing juice and also lose them. Lose / lose, so someone must give up some contractual strength, and this is up to sales departments and not coders like us.</p> <p>This must also be simulated to see how the webpages display "empty" ads when you auto-served a million and one ads in a single day for only 1 million planned ads --after all, nobody likes seeing zero ads for the other 29 business days! </p> <p>It's a tough spot because the content providers (bloggers using the page subsidized by the ad-makers) are ALSO likely to be mad at reaching bandwidth limits imposed by your hosting service... all at the same time as your Ad revenue providers cause some sort of business trouble for your midsize company. This is probably discussed in college e-commerce classes, and isn't something anyone can fix.</p>

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