1. A computer-based method for mapping information, which is stored in an information directory having a tree structure, into a relational database, comprising: operating a processor to provide a directory mapping tool; with the directory mapping tool, accessing memory storing the information directory, the directory having a plurality of data entries at nodes of the tree structure and each of the data entries comprising a plurality of attributes; storing a distinguished name (DN2ID) index table in memory including operating the directory mapping tool to generate a record in the DN2ID index table for each of the data entries, wherein a DN field of each of the data entry records of the DN2ID index table contains the attributes associated with one of the data entries; and operating the directory mapping tool to generate and store in memory a relational table associated with each object class defined for the information directory, wherein each record of each of the relational tables is linked to one or more of the data entry records in the DN2ID index table.