Hierarchical structures implementation methods on large databases

In the report are considered a question of use of a method of the nested sets, with reference to large databases. Approaches to support of hierarchical structures on a platform relational DBMS are considered. Computing efficiency of a method of the nested sets is experimentally proved in comparison with trivial methods of the organization of hierarchical structures. Lacks of a method of the nested sets, critical for large databases are described. The decisions, allowing to use a method of the nested sets in large databases are offered.