Changing table records in a database management system

A method and system for updating and deleting records in a tableset T of a family having M tables (M 1). A set S of N source files (N 1) are embodied in fileset S A at time t A and in fileset S B at time t B . S is logically associated with T. The family has a common family key K F across the M tables and across the N source files. A Delta program generates a dataset D having non-redundant family keyvalues embodying K F . Each non-redundant family keyvalue is drawn from selected Update or Delete records of S B relative to S A . For Updates, a Trigger program generates fileset S from records of S B having a family key in D, and a Bridge program generates fileset T that includes S data in a form compatible with T. A Load program updates and deletes records in T based on the non-redundant family keyvalues.