 This relational version of Datacom served as the foundation for a continuing stream of industry-leading enhancements that have preserved its position as an extremely cost-effective and high-performing DBMS for the IBM mainframe.In the 1950s and 1960s, credit bureaus were local organizations that maintained paper records about local borrowers and retail customers, usually storing these records in small envelopes filed in literally hundreds of file cabinets.In fact, one major credit bureau attempted to speed up its transaction rate by having its employees wear roller skates to move rapidly from file cabinet to file cabinet!