Question 1: Briefly describe, what is multi-pass BSN Approach?
Answer:
Multi-pass Approach
Several independent runs of the BSN method each time with a different key and a relatively small window. Each independent run will produce a set of pairs of records which can be merged (takes care of transposition errors). Apply the transitive closure property to those pairs of records. If records a and b are found to be similar and at the same time records b and c are also found to be similar the transitive closure step can mark a and c to be similar. The results will be a union of all pairs discovered by all independent runs with no duplicates plus all those pairs that can be inferred by transitivity of equality.