Data Set Diagrams

Similar to the Data Modeling Diagram,Data Set Diagrams (DSD) represent your FD files and their relations in a graphical entity relationship diagram. A DSD, however, represents files and their relationships at the program level. While a DMD is used to represent all of your files, a DSD defines a specific access to a subgroup of those files. A DSD can inherit file relations that have been defined in a DMD, but the DSD allows you to redefine those relations as needed by your application. A DSD thus allows you to organize your data in a variety of ways. Once you specify relations between master and slave files, Totem will automatically convert these new relations into code. In addition, during this code generation, DSD's Data Integrity function ensures that if you modify data in a file, you have the option of updating the related data.