Are keys in B-tree nodes duplicated when the node is split?

Posted by Phenom on Stack Overflow See other posts from Stack Overflow or by Phenom
Published on 2010-04-03T00:02:07Z Indexed on 2010/04/03 0:03 UTC
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When a node in a B-tree is split, are keys from the original node duplicated in the new nodes? What's the purpose of doing this? Isn't this inefficient?

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