Effects of Deletions and Additions on Performance
After a large number of deletions and additions have taken places, one can expect to find many tombstones occupying places that could be occupied by records whose home address precedes them but that are stored after them.
This deteriorates average search lengths.
There are 3 types of solutions for dealing with this problem: a) local reorganization during deletions; b) global reorganization when the average search length is too large; c) use of a different collision resolution algorithm.