The default Rewalk Type, a
New walk behaves just like the initial walk.
The Webinator creates a new database and does a complete walk of
everything, starting with the Base URLs. A
New walk does not disturb the
existing database during the walk.
Newwalks are useful when first setting up a profile and changing walk settings, as you're guaranteed to see your setting changes reflected in each document when a walk finishes. If you later make significant walk setting changes, it is recommended to do a
Newwalk to make sure your indexed data reflects your new settings.
Once your settings are established, though, fully processing every URL on every walk can be inefficient, and a different walk type may be more appropriate.