Advantage Concepts
With an index scope set, a Go Bottom causes a Seek for the index key ‘Phillipt’ (note that it is ‘Phillipt’ rather than ‘Phillips’). Then a negative Skip is performed to position the user on the last of any ‘Phillips’ keys. Therefore, two operations occur. A Go Bottom with an index scope set is very fast.
With a record filter set, a Go Bottom first goes to the bottom of the index (the ‘Zimmerman’ key, for instance). Then a series of sequential negative Skips occur in the index until a ‘Phillips’ key is found. The number of negative Skips depends on the number of keys in the index between ‘Zimmerman’ and ‘Phillips’. Thus, many operations occur. A Go Bottom with an index scope is extremely fast relative to a traditional record filter.