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Feydakin · #3 (**permalink**) 06-15-2006, 04:37 PM

The datacenter thing is really quite simple..

There are at least 64 datacenters out there that google usses to load balance search engine requests and test various minor changes inthe SERP algorithm.. When you make a search query you will get your results from one of the 64 datacenters..

In general, they are relatively close to each other when presenting results, except for the handful of more testing oriented centers.. So, you could do a search for something specific and get the same results over and over and then suddenly get something completly different for no apparent reason..

There are sites out there (like McDar) that will let you check SERP placement by datacenter and datacenter grouping if you really want to see where you rank across all the different datacenters..

And finally, the higher you are in the SERPs the less likely you are to be affected by the different datacenters.. It's not impossible to see different #1s across the datacenters for a certian search phrase, but it becomes very unlikely as you get to that level..