Move website from host a to host b without down time dns change

Posted by grigione on Pro Webmasters See other posts from Pro Webmasters or by grigione
Published on 2012-02-05T14:42:43Z Indexed on 2013/11/06 22:10 UTC
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dns

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web-hosting

I would like to move my website from host A to host B
I have uploaded a copy of my site to the new host, while keeping the old copy in place with the old host
I will need to update the nameservers to point to the new nameservers.
I'll want to change the DNS settings of domain name to point to new host b

To avoid down time for the DNS change to propagate through the net, can I add the old nameservers and new nameservers together without causing problems, or must I delete the old nameservers first?

What happens to my website when it points to two different nameservers?

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