I need a text editor to edit/visualize >10GB text files

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http://unix.stackexchange.com – So as to vizualize, and hopefully edit, a very large text file, more than 10GBytes (a backup dump of whole database), I have tried using vim... it didn't behave very well. I have also tried cat to at least visualize, and cat didn't not behave properly neither. Are there tools for huge file editing ? Something that would view/edit by a limited group of lines without trying to load the rest, unless told to load a new group (really limited) of lines, and maybe the possibility to jump certain places thanks to a search utility. (HowTos)