Performance of Collision Resolution Policies

Collision Resolution Policy versus Expected Number of Probes 


                            unsuccessful             successful

linear rehashing          (1/2){1+[1/(1-α)2]}       (1/2){1+[1/(1-α)]}


double hashing                  1/(1-α)             (1/α)log[1/(1-α)]


external chaining                 α                   1 + (α/2)