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Micha,
The DNS records are the same on the primary and the secondary DNS machines. Usually, a host will set everyone to use the primary first, the n the secondary in case the primary is down, rebooting, etc.
When the host starts to grow very large, all of the domain lookups are going to the primary DNS machine, where the secondary machine is sitting around, twiddling its thumbs. So, many people like to swap their DNS to use the secondary first, hoping to get their surfers to the site slightly faster.
That's the idea, anyway. The DNS lookup is fractions of a second for the surfer, but spreading the workload more evenly for the DNS servers isn't a bad idea, either. It's personal preference, and a tweak that could save precious microseconds for your consumers.
HTH
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